ELECTRICAL ENGINEERING- PAGE 3
ELECTRICAL ENGINEERING MCQs- PAGE 3
1:-In a safety sign, It's shape is circular, red border and cross bar black signal in white background the sign is
A:-Prohibition sign
B:-Mandatory sign
C:-Warning sign
D:-Information sign
Ans: A
2:-Three phase two element watt meter method is best suited for the measurement of power in
A:-Three phase balanced load
B:-Three phase unbalanced load
C:-Three phase balanced and unbalanced load
D:-None of the above
Ans: C
3:-Polarisation is the problem of _______ type of cell.
A:-Lead acid cell
B:-Nickel iron cell
C:-Dry cell
D:-Voltaic cell
Ans: D
4:-Fusing factor of HRC fuse is
A:-1.4
B:-1.2
C:-1.1
D:-1.3
Ans: C
5:-The yoke of large DC machine is made of
A:-cast iron
B:-wrought iron
C:-cast steel
D:-soft iron
Ans: C
6:-The process by which isolate the supply of oxygen to the fire is known as
A:-smothering
B:-cooling
C:-starving
D:-extinguishing
Ans: A
7:-Valancy of aluminum atom is
A:-3
B:-4
C:-2
D:-1
Ans: A
8:-When capacitor testing with ohm meter, the ohm meter shows infinite resistance, the capacitor is
A:-Good
B:-Open
C:-Leakey
D:-Shorted
Ans: B
9:-Among them which motor has highest starting torque
A:-Shaded pole motor
B:-Universal motor
C:-Capacitor start induction run motor
D:-Permanent capacitor motor
Ans: B
10:-Composition of plumbers solder is _______ % Tin and _______ % Lead.
A:-35 and 65
B:-60 and 40
C:-65 and 35
D:-50 and 60
Ans: A
11:-The speed control method used in domestic mixer grinder is
A:-voltage control method
B:-tapped field control method
C:-adding series resistance
D:-all of the above
Ans: B
12:-A moving coil volt meter shows 220 volt when it is connected across an AC supply. What will be the voltage shows when it is measured using CRO ?
A:-220 V
B:-380 V
C:-244 V
D:-311 V
Ans: D
13:-Copper loss of a transformer is 120 watt at it's 1/4th load watt will be the copper loss 1/8th full load
A:-30 watt
B:-64 watt
C:-240 watt
D:-192 watt
Ans: A
14:-To change DOR of Repulsion motor
A:-change the supply terminal of motor
B:-change the brush position of motor
C:-change the motor terminals
D:-all of the above
Ans: B
15:-The type DC generator used for electoplating is
A:-series generator
B:-long shunt compound generator
C:-shunt generator
D:-cumulative compound generator
Ans: C
16:-The type of DC compound generator used for arc welding is
A:-Over compound generator
B:-Under compound generator
C:-Differential compound generator
D:-Level compound generator
Ans: C
17:-A circuit contain R and L in series, R = 8'Ω and L = 0.02 henry, what will be the power factor of the circuit when is connected across 50 Hz, 50 volt ac supply
A:-0.821
B:-0.752
C:-0.886
D:-0.786
Ans: D
18:-Over load coil of 3 point DC motor starter is connected
A:-in series with shunt field
B:-in parallel with shunt field
C:-in series with armature coil
D:-in parallel with series field
Ans: C
19. Collector - feedback bias is
A based on the principle of positive feedback
B based on the beta multiplication
C based on the principle of negative feedback
D not very stable
Ans: C
20. A single phase fully controlled thyristor bridge rectifier is fed from a 230 V, 50 Hz single phase AC mains. If it is delivering a constant DC current of 10 A at a firing angle of 30°, then the value of power factor at AC mains is
A 0.87
B 0.9
C 0.78
D 0.45
Ans: C
21. The constant current region of a JFET lies between
A cutoff and saturation
B cutoff and pinch off
C 0 & I DSS
D pinch off and break down
Ans: D
22. A single phase full bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half cycle. The rms value of the fundamental component of the output voltage in volts is
A 234
B 245
C 300
D 331
Ans: A
23. In an 8085 microprocessor system with memory mapped I/O,
A I/O devices have 16-bit addresses
B I/O devices are accessed using IN and OUT instructions
C there can be a maximum of 256 input devices and 256 output devices
D I/O devices have 8-bit addresses
Ans: A
24. The device used to convert a binary number to a 7-segment display format is the
A Multiplexer
B Encoder
C Decoder
D Register
Ans: C
25. In a microprocessor, when a CPU is interrupted, it
A Stops execution of instructions
B Acknowledges interrupt and branches to subroutine
C Acknowledges interrupt and continue
D Acknowledges interrupt and waits for the next instruction from the interrupting device
Ans: D
26. An I/O processor controls the flow of information between
A cache memory and I/O devices
B main memory and I/O devices
C two I/O devices
D cache and main memories
Ans: B
27. A 4-bit parallel adder can add
A two 4-bit binary numbers
B two 2-bit binary numbers
C four bits at a time
D four bits in a sequence
Ans: A
28. The number of hard ware interrupts present in 8085 microprocessor are
A 1
B 4
C 5
D 13
Ans: C
29. An asynchronous counter differs from a synchronous counter in
A the number of states in its sequence
B the method of clocking
C the type of flip-flops used
D the value of the modules
Ans: B
30. A modulus -10 ring counter require a minimum of
A ten flip-flops
B five flip-flops
C four flip-flops
D twelve flip-flops
Ans: A
31. A ROM is a
A nonvolatile memory
B volatile memory
C read / write memory
D byte - organized memory
Ans: A
32. The phenomenon of overlap in converter operation occurs due to
A source resistance
B source inductance
C both source resistance and source inductance
D high value of firing angle
Ans: B
33. The average load current supplied by a thyristor depends on
A firing angle
B firing frequency
C magnitude of gate current
D all of the above
Ans: A
34. In register index addressing mode, the effective address is given by
A the index register value
B the sum of the index register value and the operand
C the operand
D the difference of the index register value and the operand
Ans: A
35. In a constant v/f induction motor drive, the slip at the maximum torque
A is directly proportional to the synchronous speed
B remains constant with respect to the synchronous speed
C has an inverse relation with the synchronous speed
D has no relation with the synchronous speed
Ans: C
36. No load current in a transformer
A lags the applied voltage by 90°
B lags the applied voltage by somewhat less than 90°
C leads the applied voltage by 90°
D leads the applied voltage by somewhat less than 90°
Ans: B
37. On the two sides of a star/delta transformer
A the voltages and currents are both in phase
B the voltages and currents both differ in phase by 30°
C the voltages differ in phase by 30° but currents are in phase
D the currents differ in phase by 30° but voltages are in phase
Ans: B
38. Short - pitching armature winding in an AC machine
A increase phase voltage but reduces its harmonic content
B increase phase voltage and its harmonic content
C reduces phase voltage and its harmonic content
D reduces phase voltage but increase its harmonic content
Ans: C
39. Field control of a DC shunt motor gives
A constant torque drive
B constant power drive
C constant speed drive
D variable load speed drive
Ans: B
40. In a synchronous machine, the voltage induced by armature reaction flux acts like
A The voltage drop in inductive reactance
B The voltage drop in resistance
C The voltage drop in capacitive reactance
D None of the above
Ans: A
41. By adding a resistance in the rotor circuit of a slip ring induction motor
A The starting current and torque both reduce (compared to DOL start)
B The starting current and torque both increase
C The starting current reduces but starting torque increases
D The starting current increases but starting torque decreases
Ans: C
42. A capacitor start single phase induction motor is used
A For easy to start loads
B For medium start loads
C For hard to start loads
D For any type of start loads
Ans: C
43. If the length of a cable is doubled, its capacitance
A Becomes one-fourth
B Becomes one-half
C Becomes double
D Remaines unchanged
Ans: C
44. The arc voltage produced in AC circuit breaker is always
A In phase with the arc current
B Lagging the arc current by 90°
C Leading the arc current by 90°
D None of the above
Ans: A
45. Burden of a protective relay is the power
A required to operate the circuit breaker
B absorbed by the circuit of relay
C developed by the relay circuit
D None of the above
Ans: B
46. A synchronous condenser is
A an induction motor
B under excited synchronous motor
C over excited synchronous motor
D DC generator
Ans: C
47.The FACTS device which uses voltage source converter in it is
A TCSC
B SVC
C TCR
D SSSC
Ans: D
48. The condition for a stable system in z - domain can be given as
A |z| > 1
B |z| < 1
C |z| = 1
D |z| ≠1
Ans: B
49. The other name of common collector amplifier is
A Source follower
B Collector follower
C Emitter follower
D Base follower
Ans: C
50. A low pass filter can behave as follows:
A Differentiator
B Integrator
C Differentiator and integrator
D Neither Differentiator nor integrator
Ans: B
A:-Prohibition sign
B:-Mandatory sign
C:-Warning sign
D:-Information sign
Ans: A
2:-Three phase two element watt meter method is best suited for the measurement of power in
A:-Three phase balanced load
B:-Three phase unbalanced load
C:-Three phase balanced and unbalanced load
D:-None of the above
Ans: C
3:-Polarisation is the problem of _______ type of cell.
A:-Lead acid cell
B:-Nickel iron cell
C:-Dry cell
D:-Voltaic cell
Ans: D
4:-Fusing factor of HRC fuse is
A:-1.4
B:-1.2
C:-1.1
D:-1.3
Ans: C
5:-The yoke of large DC machine is made of
A:-cast iron
B:-wrought iron
C:-cast steel
D:-soft iron
Ans: C
6:-The process by which isolate the supply of oxygen to the fire is known as
A:-smothering
B:-cooling
C:-starving
D:-extinguishing
Ans: A
7:-Valancy of aluminum atom is
A:-3
B:-4
C:-2
D:-1
Ans: A
8:-When capacitor testing with ohm meter, the ohm meter shows infinite resistance, the capacitor is
A:-Good
B:-Open
C:-Leakey
D:-Shorted
Ans: B
9:-Among them which motor has highest starting torque
A:-Shaded pole motor
B:-Universal motor
C:-Capacitor start induction run motor
D:-Permanent capacitor motor
Ans: B
10:-Composition of plumbers solder is _______ % Tin and _______ % Lead.
A:-35 and 65
B:-60 and 40
C:-65 and 35
D:-50 and 60
Ans: A
11:-The speed control method used in domestic mixer grinder is
A:-voltage control method
B:-tapped field control method
C:-adding series resistance
D:-all of the above
Ans: B
12:-A moving coil volt meter shows 220 volt when it is connected across an AC supply. What will be the voltage shows when it is measured using CRO ?
A:-220 V
B:-380 V
C:-244 V
D:-311 V
Ans: D
13:-Copper loss of a transformer is 120 watt at it's 1/4th load watt will be the copper loss 1/8th full load
A:-30 watt
B:-64 watt
C:-240 watt
D:-192 watt
Ans: A
14:-To change DOR of Repulsion motor
A:-change the supply terminal of motor
B:-change the brush position of motor
C:-change the motor terminals
D:-all of the above
Ans: B
15:-The type DC generator used for electoplating is
A:-series generator
B:-long shunt compound generator
C:-shunt generator
D:-cumulative compound generator
Ans: C
16:-The type of DC compound generator used for arc welding is
A:-Over compound generator
B:-Under compound generator
C:-Differential compound generator
D:-Level compound generator
Ans: C
17:-A circuit contain R and L in series, R = 8'Ω and L = 0.02 henry, what will be the power factor of the circuit when is connected across 50 Hz, 50 volt ac supply
A:-0.821
B:-0.752
C:-0.886
D:-0.786
Ans: D
18:-Over load coil of 3 point DC motor starter is connected
A:-in series with shunt field
B:-in parallel with shunt field
C:-in series with armature coil
D:-in parallel with series field
Ans: C
19. Collector - feedback bias is
A based on the principle of positive feedback
B based on the beta multiplication
C based on the principle of negative feedback
D not very stable
Ans: C
20. A single phase fully controlled thyristor bridge rectifier is fed from a 230 V, 50 Hz single phase AC mains. If it is delivering a constant DC current of 10 A at a firing angle of 30°, then the value of power factor at AC mains is
A 0.87
B 0.9
C 0.78
D 0.45
Ans: C
21. The constant current region of a JFET lies between
A cutoff and saturation
B cutoff and pinch off
C 0 & I DSS
D pinch off and break down
Ans: D
22. A single phase full bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half cycle. The rms value of the fundamental component of the output voltage in volts is
A 234
B 245
C 300
D 331
Ans: A
23. In an 8085 microprocessor system with memory mapped I/O,
A I/O devices have 16-bit addresses
B I/O devices are accessed using IN and OUT instructions
C there can be a maximum of 256 input devices and 256 output devices
D I/O devices have 8-bit addresses
Ans: A
24. The device used to convert a binary number to a 7-segment display format is the
A Multiplexer
B Encoder
C Decoder
D Register
Ans: C
25. In a microprocessor, when a CPU is interrupted, it
A Stops execution of instructions
B Acknowledges interrupt and branches to subroutine
C Acknowledges interrupt and continue
D Acknowledges interrupt and waits for the next instruction from the interrupting device
Ans: D
26. An I/O processor controls the flow of information between
A cache memory and I/O devices
B main memory and I/O devices
C two I/O devices
D cache and main memories
Ans: B
27. A 4-bit parallel adder can add
A two 4-bit binary numbers
B two 2-bit binary numbers
C four bits at a time
D four bits in a sequence
Ans: A
28. The number of hard ware interrupts present in 8085 microprocessor are
A 1
B 4
C 5
D 13
Ans: C
29. An asynchronous counter differs from a synchronous counter in
A the number of states in its sequence
B the method of clocking
C the type of flip-flops used
D the value of the modules
Ans: B
30. A modulus -10 ring counter require a minimum of
A ten flip-flops
B five flip-flops
C four flip-flops
D twelve flip-flops
Ans: A
31. A ROM is a
A nonvolatile memory
B volatile memory
C read / write memory
D byte - organized memory
Ans: A
32. The phenomenon of overlap in converter operation occurs due to
A source resistance
B source inductance
C both source resistance and source inductance
D high value of firing angle
Ans: B
33. The average load current supplied by a thyristor depends on
A firing angle
B firing frequency
C magnitude of gate current
D all of the above
Ans: A
34. In register index addressing mode, the effective address is given by
A the index register value
B the sum of the index register value and the operand
C the operand
D the difference of the index register value and the operand
Ans: A
35. In a constant v/f induction motor drive, the slip at the maximum torque
A is directly proportional to the synchronous speed
B remains constant with respect to the synchronous speed
C has an inverse relation with the synchronous speed
D has no relation with the synchronous speed
Ans: C
36. No load current in a transformer
A lags the applied voltage by 90°
B lags the applied voltage by somewhat less than 90°
C leads the applied voltage by 90°
D leads the applied voltage by somewhat less than 90°
Ans: B
37. On the two sides of a star/delta transformer
A the voltages and currents are both in phase
B the voltages and currents both differ in phase by 30°
C the voltages differ in phase by 30° but currents are in phase
D the currents differ in phase by 30° but voltages are in phase
Ans: B
38. Short - pitching armature winding in an AC machine
A increase phase voltage but reduces its harmonic content
B increase phase voltage and its harmonic content
C reduces phase voltage and its harmonic content
D reduces phase voltage but increase its harmonic content
Ans: C
39. Field control of a DC shunt motor gives
A constant torque drive
B constant power drive
C constant speed drive
D variable load speed drive
Ans: B
40. In a synchronous machine, the voltage induced by armature reaction flux acts like
A The voltage drop in inductive reactance
B The voltage drop in resistance
C The voltage drop in capacitive reactance
D None of the above
Ans: A
41. By adding a resistance in the rotor circuit of a slip ring induction motor
A The starting current and torque both reduce (compared to DOL start)
B The starting current and torque both increase
C The starting current reduces but starting torque increases
D The starting current increases but starting torque decreases
Ans: C
42. A capacitor start single phase induction motor is used
A For easy to start loads
B For medium start loads
C For hard to start loads
D For any type of start loads
Ans: C
43. If the length of a cable is doubled, its capacitance
A Becomes one-fourth
B Becomes one-half
C Becomes double
D Remaines unchanged
Ans: C
44. The arc voltage produced in AC circuit breaker is always
A In phase with the arc current
B Lagging the arc current by 90°
C Leading the arc current by 90°
D None of the above
Ans: A
45. Burden of a protective relay is the power
A required to operate the circuit breaker
B absorbed by the circuit of relay
C developed by the relay circuit
D None of the above
Ans: B
46. A synchronous condenser is
A an induction motor
B under excited synchronous motor
C over excited synchronous motor
D DC generator
Ans: C
47.The FACTS device which uses voltage source converter in it is
A TCSC
B SVC
C TCR
D SSSC
Ans: D
48. The condition for a stable system in z - domain can be given as
A |z| > 1
B |z| < 1
C |z| = 1
D |z| ≠1
Ans: B
49. The other name of common collector amplifier is
A Source follower
B Collector follower
C Emitter follower
D Base follower
Ans: C
50. A low pass filter can behave as follows:
A Differentiator
B Integrator
C Differentiator and integrator
D Neither Differentiator nor integrator
Ans: B
51. Common mode rejection ratio (CMRR) for an operational amplifier should have value
A Equal to 1
B Near to 1
C Very less
D As maximum as possible
Ans: D
52. In operational amplifier circuit, suppose we ground non-inverting input, in that case the inverting input
A Becomes zero
B Behaves like a virtual ground
C Becomes very high
D None of the above
Ans: B
53. In a 100 bus power system ,there are 10 generators. In Particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration ,
A The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two
B the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two
C The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two
D the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two
Ans: B
54. If two sinusoidal vectors with different amplitudes and phases are added together, then the resulting vector is polarized
A Linearly
B Elliptically
C Circularly
D None of the above
Ans: B
55. The Boolean expression A = Z(Y+Z) (X+Y+Z) can be simplified to
A X
B Y
C Z
D XY
Ans: C
56. In JK flip flop, the race round condition takes place when,
A J=0,K=0
B J=0,K=1
C J=1,K=0
D J=1,K=1
Ans: D
57. The half adder circuit has the following number of inputs and outputs respectively
A 1,2
B 2,1
C 2,2
D 2,3
Ans: C
58. Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an over excited condition and a directly grid connected induction generator. Consider capacitive VAr to be source and inductive VAr to be sink of reactive power. Which one of the following statement is true ?
A Synchronous motor and synchronous generators are sources and induction generator is a sink of reactive power
B Synchronous motor and induction generator are sources and synchronous generator is a sink of reactive power.
C Synchronous motor is a source and induction generator and synchronous generator are sinks of reactive power
D All are sources of reactive power
Ans: A
59. The lag compensator can be considered as:
A A low pass filter
B A high pass filter
C A band pass filter
D A band stop filter
Ans: A
60. Transducer is a device which is
A Useful for converting power from one form to other form
B Useful for converting energy from one form to other form
C Useful in measurement of electrical signals
D Useful in amplification of the signals
Ans: B
61. In an ideal Ammeter, the internal resistance should be
A Infinite
B High value
C Zero
D Medium
Ans: C
62. The following bridge can be used for measuring the dielectric loss of the capacitor
A Owen bridge
B Wien bridge
C Schering bridge
D Maxwell bridge
Ans: C
63. Q-meter works on the following principle:
A Parallel resonance circuit
B Series resonance circuit
C Mutual inductance
D Self inductance
Ans: B
64. Pre emphasis in frequency modulated (FM) communication system is generally used for
A Amplifying low-frequency components
B Amplifying high-frequency components
C Amplifying low and high frequency components
D Amplifying DC component
Ans: B
65. A linear discrete time system has the characteristic equation, z3-0.81z = 0. The system is
A Stable
B Marginally Stable
C Unstable
D Stability cannot be assessed from the given information
Ans: A
66. The following modulation system requires minimum channel bandwidth:
A Vestigial side band (VSB)
B Double side band suppressed carrier (DSB-SC)
C Single side band (SSB)
D Amplitude modulation (AM)
Ans: C
67. In television system, the following modulation schemes are used for picture and sound respectively
A Frequency modulation, Amplitude modulation
B Amplitude modulation , Frequency modulation
C Amplitude modulation, Amplitude modulation
D Frequency modulation, Frequency modulation
Ans: B
68. The following type of system can be represented in unique way with the help of transfer function:
A Linear time - variant systems
B Non linear time - variant systems
C Non linear time - invariant systems
D Linear time - invariant systems
Ans: D
69. The phase cross over frequency is derived where the phase angle has following value:
A – π radian
B π radian
C π /2 radian
D 0
Ans: B
70. The phase margin of a stable feedback system is
A Always negative
B Always positive
C May be positive or negative
D None of the above
Ans: B
71. The following type of systems has tendency to generate oscillations:
A Closed loop system
B Open loop system
C Open and closed loop system
D None of the above
Ans: A
72. In Amplitude Modulation (AM) communication systems, the oscillator frequency in receiver is as:
A Always 455 Hz
B More than signal frequency
C Less than signal frequency
D Same as signal frequency
Ans: B
73. Quantization error takes place in the following process:
A Pulse width modulation
B Pulse code modulation
C Frequency division multiplexing
D Time division multiplexing
Ans: B
74. The Quantization noise can be reduced by
A Using radio frequency amplifier in the receiver
B Increasing number of quantization levels
C Sending sloping pulses
D Applying de-emphasis circuit
Ans: B
75. In Amplitude modulation (AM) system, a carrier is modulated by two sinusoidal message signals with modulation index of 0.6 and 0.8 respectively. Then, the resulting modulation index will be as:
A 1.4
B 0.8
C 1.0
D 0.2
Ans: C
76. In the amplitude modulation (AM) communication system, the modulation index should be in the following range:
A 0 to 1
B -1 to 1
C 1 to 2
D -1 to 0
Ans: A
77. For a narrow-band frequency modulated (FM) signal, the generated bandwidth for 5 KHz audio signal will be
A 5 KHz
B 10 KHz
C 20 KHz
D 30 KHz
Ans: B
78. If signal energy (E) satisfies the following condition 0 < E < , then this signal will be called as:
A Energy signal
B Power signal
C Stationary signal
D Non-stationary signal
Ans: A
79. For two events A and B that are independent and mutually exclusive then the probability P(AB) will be
A 1
B 0
C D
0.5
Ans: B
80. The mean of the random process
Z(t)= Y(t)- Y(t-T)
can be given as
A 1
B 0
C T
D 2T
Ans: B
81.The following statement is true:
A JFET can be represented as a current controlled current source
B JFET can be represented as a current controlled voltage source
C JFET can be represented as a voltage controlled voltage source
D JFET can be represented as a voltage controlled current source
Ans: C
82. Nyquist rate (NR) of the signal and maximum frequency (MF) are related as:
A NR = MF
B NR = 2MF
C NR = 1/MF
D NR = MF/2
Ans: B
83 Ripple factor is defined as:
A RMS Value / Peak value
B Peak value / RMS value
C Peak Value / DC value
D RMS Value / DC value
Ans: D
84. Diffraction in electromagnetic waves takes place due to
A Spherical waveforms
B Edge of a sharp obstacle
C Waves pass through a large slot
D Reflections from the ground
Ans: B
85. In parabolic reflector, the Cassegrain feed is used for the following purpose:
A In order to make high gain of the system
B In order to make higher bandwidth of the system
C In order to decrease size of the main reflector
D In order to place the feed at a convenient point
Ans: D
86. A PIN diode finds application as
A Microwave switch
B Microwave detector
C Microwave mixer diode
D Metal semiconductor point-contact diode
Ans: A
A Equal to 1
B Near to 1
C Very less
D As maximum as possible
Ans: D
52. In operational amplifier circuit, suppose we ground non-inverting input, in that case the inverting input
A Becomes zero
B Behaves like a virtual ground
C Becomes very high
D None of the above
Ans: B
53. In a 100 bus power system ,there are 10 generators. In Particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration ,
A The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two
B the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two
C The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two
D the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two
Ans: B
54. If two sinusoidal vectors with different amplitudes and phases are added together, then the resulting vector is polarized
A Linearly
B Elliptically
C Circularly
D None of the above
Ans: B
55. The Boolean expression A = Z(Y+Z) (X+Y+Z) can be simplified to
A X
B Y
C Z
D XY
Ans: C
56. In JK flip flop, the race round condition takes place when,
A J=0,K=0
B J=0,K=1
C J=1,K=0
D J=1,K=1
Ans: D
57. The half adder circuit has the following number of inputs and outputs respectively
A 1,2
B 2,1
C 2,2
D 2,3
Ans: C
58. Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an over excited condition and a directly grid connected induction generator. Consider capacitive VAr to be source and inductive VAr to be sink of reactive power. Which one of the following statement is true ?
A Synchronous motor and synchronous generators are sources and induction generator is a sink of reactive power
B Synchronous motor and induction generator are sources and synchronous generator is a sink of reactive power.
C Synchronous motor is a source and induction generator and synchronous generator are sinks of reactive power
D All are sources of reactive power
Ans: A
59. The lag compensator can be considered as:
A A low pass filter
B A high pass filter
C A band pass filter
D A band stop filter
Ans: A
60. Transducer is a device which is
A Useful for converting power from one form to other form
B Useful for converting energy from one form to other form
C Useful in measurement of electrical signals
D Useful in amplification of the signals
Ans: B
61. In an ideal Ammeter, the internal resistance should be
A Infinite
B High value
C Zero
D Medium
Ans: C
62. The following bridge can be used for measuring the dielectric loss of the capacitor
A Owen bridge
B Wien bridge
C Schering bridge
D Maxwell bridge
Ans: C
63. Q-meter works on the following principle:
A Parallel resonance circuit
B Series resonance circuit
C Mutual inductance
D Self inductance
Ans: B
64. Pre emphasis in frequency modulated (FM) communication system is generally used for
A Amplifying low-frequency components
B Amplifying high-frequency components
C Amplifying low and high frequency components
D Amplifying DC component
Ans: B
65. A linear discrete time system has the characteristic equation, z3-0.81z = 0. The system is
A Stable
B Marginally Stable
C Unstable
D Stability cannot be assessed from the given information
Ans: A
66. The following modulation system requires minimum channel bandwidth:
A Vestigial side band (VSB)
B Double side band suppressed carrier (DSB-SC)
C Single side band (SSB)
D Amplitude modulation (AM)
Ans: C
67. In television system, the following modulation schemes are used for picture and sound respectively
A Frequency modulation, Amplitude modulation
B Amplitude modulation , Frequency modulation
C Amplitude modulation, Amplitude modulation
D Frequency modulation, Frequency modulation
Ans: B
68. The following type of system can be represented in unique way with the help of transfer function:
A Linear time - variant systems
B Non linear time - variant systems
C Non linear time - invariant systems
D Linear time - invariant systems
Ans: D
69. The phase cross over frequency is derived where the phase angle has following value:
A – π radian
B π radian
C π /2 radian
D 0
Ans: B
70. The phase margin of a stable feedback system is
A Always negative
B Always positive
C May be positive or negative
D None of the above
Ans: B
71. The following type of systems has tendency to generate oscillations:
A Closed loop system
B Open loop system
C Open and closed loop system
D None of the above
Ans: A
72. In Amplitude Modulation (AM) communication systems, the oscillator frequency in receiver is as:
A Always 455 Hz
B More than signal frequency
C Less than signal frequency
D Same as signal frequency
Ans: B
73. Quantization error takes place in the following process:
A Pulse width modulation
B Pulse code modulation
C Frequency division multiplexing
D Time division multiplexing
Ans: B
74. The Quantization noise can be reduced by
A Using radio frequency amplifier in the receiver
B Increasing number of quantization levels
C Sending sloping pulses
D Applying de-emphasis circuit
Ans: B
75. In Amplitude modulation (AM) system, a carrier is modulated by two sinusoidal message signals with modulation index of 0.6 and 0.8 respectively. Then, the resulting modulation index will be as:
A 1.4
B 0.8
C 1.0
D 0.2
Ans: C
76. In the amplitude modulation (AM) communication system, the modulation index should be in the following range:
A 0 to 1
B -1 to 1
C 1 to 2
D -1 to 0
Ans: A
77. For a narrow-band frequency modulated (FM) signal, the generated bandwidth for 5 KHz audio signal will be
A 5 KHz
B 10 KHz
C 20 KHz
D 30 KHz
Ans: B
78. If signal energy (E) satisfies the following condition 0 < E < , then this signal will be called as:
A Energy signal
B Power signal
C Stationary signal
D Non-stationary signal
Ans: A
79. For two events A and B that are independent and mutually exclusive then the probability P(AB) will be
A 1
B 0
C D
0.5
Ans: B
80. The mean of the random process
Z(t)= Y(t)- Y(t-T)
can be given as
A 1
B 0
C T
D 2T
Ans: B
81.The following statement is true:
A JFET can be represented as a current controlled current source
B JFET can be represented as a current controlled voltage source
C JFET can be represented as a voltage controlled voltage source
D JFET can be represented as a voltage controlled current source
Ans: C
82. Nyquist rate (NR) of the signal and maximum frequency (MF) are related as:
A NR = MF
B NR = 2MF
C NR = 1/MF
D NR = MF/2
Ans: B
83 Ripple factor is defined as:
A RMS Value / Peak value
B Peak value / RMS value
C Peak Value / DC value
D RMS Value / DC value
Ans: D
84. Diffraction in electromagnetic waves takes place due to
A Spherical waveforms
B Edge of a sharp obstacle
C Waves pass through a large slot
D Reflections from the ground
Ans: B
85. In parabolic reflector, the Cassegrain feed is used for the following purpose:
A In order to make high gain of the system
B In order to make higher bandwidth of the system
C In order to decrease size of the main reflector
D In order to place the feed at a convenient point
Ans: D
86. A PIN diode finds application as
A Microwave switch
B Microwave detector
C Microwave mixer diode
D Metal semiconductor point-contact diode
Ans: A
87. A 10 Ω resistor, a 1 H inductor and 1µ F capacitor are connected in parallel . The combination is driven by a unit step current.
Under steady state conditions , the source current flows through
A the resistor
B the inductor
C the capacitor
D all the three elements
Ans: B
88. Norton's theorem states that a complex network conncected to a load can be replaced with an equivalent impedance
A in series with a current source
B in parallel with a voltage source
C in series with a voltage source
D in parallel with a current source
Ans: D
89. The condition AD - BC = 1 for a two port network implies that the network is a
A reciprocal network
B lumped element network
C lossless network
D unilateral element network
Ans: A
90. For which of the following materials, the relative permeability is much greater than unity ?
A Diamagnetic materials
B Paramagnetic materials
C Ferromagnetic materials
D None of the above
Ans: C
91. Dielectric materials are essentially
A Insulating materials
B Conducting materials
C Semi conducting materials
D Ferro electric materials
Ans: A
92. Super conductors are becoming popular for use in
A Manufacturing of memories
B Generating a very strong magnetic field
C Generating a very strong electrostatic field
D Generating regions free from magnetic field
Ans: A
93. Power consumed by a simple dc circuit can be measured with the help of a single ammeter if
A the load resistance is known
B the supply voltage is known
C the supply current is known
D cannot be measured
Ans: A
94. Harmonic distortions in power supply does not affect the performance of Maxwell's bridge since
A Filters are used to remove harmonics
B Final expression for unknown inductance contains only fundamental frequency
C Mechanical resonance frequency of null detectors are beyond the range of harmonic frequencies
D Final expression for unknown inductance is independent of frequency
Ans: D
95. A meggar is used for measurement of
A low value resistance
B medium value resistance
C high value particularly insulation resistance
D All of the above
Ans: C
96. Purely mechanical instruments cannot be used for dynamic measurements because they have
A Large time constant
B Higher response time
C High inertia
D All of the above
Ans: D
97. The time base signal in a CRO is
A a sinusoidal signal
B a sawtooth signal
C a square wave signal
D a triangular wave signal
Ans: B
98. Line regulation is determined by
A load current
B zener current and load current
C changes in load resistance and output voltage
D changes in output voltage and input voltage
Ans: D
Under steady state conditions , the source current flows through
A the resistor
B the inductor
C the capacitor
D all the three elements
Ans: B
88. Norton's theorem states that a complex network conncected to a load can be replaced with an equivalent impedance
A in series with a current source
B in parallel with a voltage source
C in series with a voltage source
D in parallel with a current source
Ans: D
89. The condition AD - BC = 1 for a two port network implies that the network is a
A reciprocal network
B lumped element network
C lossless network
D unilateral element network
Ans: A
90. For which of the following materials, the relative permeability is much greater than unity ?
A Diamagnetic materials
B Paramagnetic materials
C Ferromagnetic materials
D None of the above
Ans: C
91. Dielectric materials are essentially
A Insulating materials
B Conducting materials
C Semi conducting materials
D Ferro electric materials
Ans: A
92. Super conductors are becoming popular for use in
A Manufacturing of memories
B Generating a very strong magnetic field
C Generating a very strong electrostatic field
D Generating regions free from magnetic field
Ans: A
93. Power consumed by a simple dc circuit can be measured with the help of a single ammeter if
A the load resistance is known
B the supply voltage is known
C the supply current is known
D cannot be measured
Ans: A
94. Harmonic distortions in power supply does not affect the performance of Maxwell's bridge since
A Filters are used to remove harmonics
B Final expression for unknown inductance contains only fundamental frequency
C Mechanical resonance frequency of null detectors are beyond the range of harmonic frequencies
D Final expression for unknown inductance is independent of frequency
Ans: D
95. A meggar is used for measurement of
A low value resistance
B medium value resistance
C high value particularly insulation resistance
D All of the above
Ans: C
96. Purely mechanical instruments cannot be used for dynamic measurements because they have
A Large time constant
B Higher response time
C High inertia
D All of the above
Ans: D
97. The time base signal in a CRO is
A a sinusoidal signal
B a sawtooth signal
C a square wave signal
D a triangular wave signal
Ans: B
98. Line regulation is determined by
A load current
B zener current and load current
C changes in load resistance and output voltage
D changes in output voltage and input voltage
Ans: D
99. In MCB overload tripping is executed by
A) Magnetic coil B) Overload coil
C) Bimetal strip D) Solenoid
Ans: C
100. When silica gel in breather is saturated with moisture its colour changes from
A) Blue to pink B) Pink to blue
C) Blue to yellow D) Blue to red
Ans: A
A) Magnetic coil B) Overload coil
C) Bimetal strip D) Solenoid
Ans: C
100. When silica gel in breather is saturated with moisture its colour changes from
A) Blue to pink B) Pink to blue
C) Blue to yellow D) Blue to red
Ans: A
- UPSC Exam Syllabus- Electrical Engineering
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