ELECTRONICS ENGINEERING
ELECTRONICS ENGINEERING MCQs
1:-A BCD-to-Decimal decoder converts
A:-BCD code to decimal digits
B:-Binary code to decimal digits
C:-BCD code to binary code
D:-BCD code to grey code
Ans: B
2:-The number of flip-flops required to construct a decade counter is ___________.
A:-2
B:-3
C:-4
D:-6
Ans: C
3:-The number of NOR gates required to construct R-S flip-flop is ____________.
A:-1
B:-2
C:-3
D:-4
Ans: B
4:-The basic building block of a counter is ___________.
A:-AND gate
B:-OR gate
C:-NAND gate
D:-Flip-flops
Ans: D
5:-ROM is a non-volatile memory. The name of volatile memory is _______________.
A:-PROM
B:-SRAM
C:-EPROM
D:-RAM
Ans: D
6:-Modern data storage device named 'pen drive' has a capacity of storing 16 GB data, what does it mean
A:-16 × `"10^9"` ` `bytes
B:-16 × `"10^6"` bytes
C:-16 × `"10^9"` bits
D:-16 × `"10^6"` bits
Ans: A
7:-An OP-AMP is designed to amplify
A:-AC voltage
B:-DC voltage
C:-Both AC and DC voltage
D:-Pulse signals only
Ans: C
8:-DC operating voltage of IC 555 is
A:-+5 to +18 V
B:-+18 to +36 V
C:-+5 to +28 V
D:-+18 to +48 V
Ans: A
9:-Approximately what is the frequency limit of the optical fibre
A:-20 GHz
B:-1 MHz
C:-100 MHz
D:-40 GHz
Ans: D
10:-The higher the index number of a fibre optic cable _____________.
A:-The higher the speed of light
B:-The lower the speed of light
C:-Has no effect on the speed of light
D:-The shorter the wavelength propagation
Ans: B
11:-The three major groups in the optical system are
A:-The components, the data rate and response time
B:-The source, the link and the receiver
C:-The transmitter, the cable and the receiver
D:-The source, the link and the detector
Ans: C
A:-BCD code to decimal digits
B:-Binary code to decimal digits
C:-BCD code to binary code
D:-BCD code to grey code
Ans: B
2:-The number of flip-flops required to construct a decade counter is ___________.
A:-2
B:-3
C:-4
D:-6
Ans: C
3:-The number of NOR gates required to construct R-S flip-flop is ____________.
A:-1
B:-2
C:-3
D:-4
Ans: B
4:-The basic building block of a counter is ___________.
A:-AND gate
B:-OR gate
C:-NAND gate
D:-Flip-flops
Ans: D
5:-ROM is a non-volatile memory. The name of volatile memory is _______________.
A:-PROM
B:-SRAM
C:-EPROM
D:-RAM
Ans: D
6:-Modern data storage device named 'pen drive' has a capacity of storing 16 GB data, what does it mean
A:-16 × `"10^9"` ` `bytes
B:-16 × `"10^6"` bytes
C:-16 × `"10^9"` bits
D:-16 × `"10^6"` bits
Ans: A
7:-An OP-AMP is designed to amplify
A:-AC voltage
B:-DC voltage
C:-Both AC and DC voltage
D:-Pulse signals only
Ans: C
8:-DC operating voltage of IC 555 is
A:-+5 to +18 V
B:-+18 to +36 V
C:-+5 to +28 V
D:-+18 to +48 V
Ans: A
9:-Approximately what is the frequency limit of the optical fibre
A:-20 GHz
B:-1 MHz
C:-100 MHz
D:-40 GHz
Ans: D
10:-The higher the index number of a fibre optic cable _____________.
A:-The higher the speed of light
B:-The lower the speed of light
C:-Has no effect on the speed of light
D:-The shorter the wavelength propagation
Ans: B
11:-The three major groups in the optical system are
A:-The components, the data rate and response time
B:-The source, the link and the receiver
C:-The transmitter, the cable and the receiver
D:-The source, the link and the detector
Ans: C
12:-High speed switching can be obtained using a ____________.
A:-Power IGBT
B:-PNP transistor
C:-Diode
D:-Vibrator
Ans: A
13:-Power MOSFET and power IGBT are __________
A:-One and the same device
B:-Quite different devices
C:-Similar semiconductor devices
D:-Replaceable devices
Ans: C
14:-Which one of the following semiconductor device may be used as a light sensor?
A:-Photo diode
B:-Photo transistor
C:-LDR
D:-Any one of the above
Ans: D
15:-The material used for making optic-fibre cable in general is ___________.
A:-Copper
B:-Transparent plastic
C:-Aluminium
D:-Steel
Ans: B
16:-Which one of the following IC contains NOT gates ___________?
A:-IC 7400
B:-IC 7404
C:-IC 7402
D:-IC 7408
Ans: B
17:-Which of the following gates gives a high output with all its inputs high
A:-NOT
B:-NOR
C:-OR
D:-X-OR
Ans: C
18:-The logic gate which has 'high' output when its inputs are different is ___________.
A:-NOR
B:-EX-OR
C:-NAND
D:-EX-NOR
Ans: B
19:-The biggest advantage of ECL is ___________.
A:-High fan out
B:-High speed
C:-Low power consumption
D:-High density
Ans: B
20:-The term CMOS stands for
A:-Capacitance Metal Oxide Semiconductor
B:-Complimentary Metal Oxide Semiconductor
C:-Charged Metal Oxide Semiconductor
D:-Copper Metal Oxide Semiconductor
Ans: B
A:-Power IGBT
B:-PNP transistor
C:-Diode
D:-Vibrator
Ans: A
13:-Power MOSFET and power IGBT are __________
A:-One and the same device
B:-Quite different devices
C:-Similar semiconductor devices
D:-Replaceable devices
Ans: C
14:-Which one of the following semiconductor device may be used as a light sensor?
A:-Photo diode
B:-Photo transistor
C:-LDR
D:-Any one of the above
Ans: D
15:-The material used for making optic-fibre cable in general is ___________.
A:-Copper
B:-Transparent plastic
C:-Aluminium
D:-Steel
Ans: B
16:-Which one of the following IC contains NOT gates ___________?
A:-IC 7400
B:-IC 7404
C:-IC 7402
D:-IC 7408
Ans: B
17:-Which of the following gates gives a high output with all its inputs high
A:-NOT
B:-NOR
C:-OR
D:-X-OR
Ans: C
18:-The logic gate which has 'high' output when its inputs are different is ___________.
A:-NOR
B:-EX-OR
C:-NAND
D:-EX-NOR
Ans: B
19:-The biggest advantage of ECL is ___________.
A:-High fan out
B:-High speed
C:-Low power consumption
D:-High density
Ans: B
20:-The term CMOS stands for
A:-Capacitance Metal Oxide Semiconductor
B:-Complimentary Metal Oxide Semiconductor
C:-Charged Metal Oxide Semiconductor
D:-Copper Metal Oxide Semiconductor
Ans: B
21:-Silicon has an atomic number of 14, this means the atom has 14 ____________.
A:-Neutrons
B:-Electrons
C:-Protons and neutrons combined together
D:-Valence electrons
Ans: B
22:-The most commonly used electrical conductor is ___________.
A:-Lead
B:-Tin
C:-Brass
D:-Copper
Ans: D
23:-The opposition offered to the movement of electrons/current flow is known as __________.
A:-Electric resistance
B:-Current
C:-Voltage
D:-None of these
Ans: A
24:-In a meter one main scale division is 5 volts, and it is divided into 10 small scale divisions. The meter can measure a minimum voltage of _____________.
A:-5 V
B:-0.5 V
C:-0.1 V
D:-1 V
Ans: B
25:-As the field intensity (H) in the core is increased, the flux density (B) ___________.
A:-Increases
B:-Decreases
C:-Becomes zero
D:-Does not change
Ans: A
26:-Material which can be strongly magnetised are known as ____________ materials.
A:-Paramagnetic
B:-Diamagnetic
C:-Ferro magnetic
D:-Pure magnet
Ans: C
27:-What material is used for making armature core?
A:-Silicon steel
B:-Aluminium
C:-Copper
D:-Mild steel
Ans: A
28:-The speed of a universal motor ____________.
A:-Remains constant to the applied load
B:-Is directly proportional to the applied load
C:-Is inversely proportional to the applied load
D:-Becomes zero when load is applied
Ans: C
29:-The basic unit of inductance is ___________.
A:-Farad
B:-Webber
C:-Henry
D:-Hertz
Ans: C
30:-Inductive reactance of a coil is directly proportional to the ___________.
A:-Alternating current following through it
B:-Induced emf in it
C:-Frequency of AC flowing through it
D:-All the parameters mentioned at A, B and C
Ans: D
31:-Two capacitors C1 = 1 nf and C2 = 10 nf, are connected in series and applied to the battery voltage V = 11 V. What are the voltages across the capacitors?
A:-VC1 = 5.5 V; VC2 = 5.5 V
B:-VC1 = 10 V; VC2 = 1 V
C:-VC1 = 1 V; VC2 = 10 V
D:-VC1 = 0 V; VC2 = 11 V
Ans: B
32:-Mutual induction is obtained by placing two current carrying coils ___________.
A:-Side by side close to each other
B:-Perpendicular to each other
C:-Far away from each other
D:-Both (1) and (2) above
Ans: A
33:-The fundamental unit of measurement of resistance is ____________.
A:-Ohm
B:-Milli ohm
C:-Kilo ohm
D:-Mega ohm
Ans: A
34:-For measuring unknown resistance, initially choose ____________.
A:-The highest ohms range
B:-The lowest ohms range
C:-Any ohms range
D:-R × 10 ohms range
Ans: A
35:-When three resistors R1, R2 and R3 are connected in series, the total resistance `"R_T" =`
A:-R1 + R2 + R3
B:-R1 × R2 × R3
C:-1/R1 + 1/R2 + 1/R3
D:-1/R1 × 1/R2 × 1/R3
Ans: A
36:-Magnetic lines are concentrated at ___________.
A:-At the centre of magnet
B:-Any one end of the magnet
C:-Along the magnet uniformly
D:-Both the ends of the magnet
Ans: D
37:-Generation and distribution of AC power in India is normally ___________.
A:-Single phase
B:-3 phase
C:-2 phase
D:-Either 2 phase or 3 phase
Ans: B
38:-The principle of operation of universal motor, similar to __________.
A:-DC shunt motor
B:-DC series motor
C:-DC short-shunt compound motor
D:-DC long-shunt compound motor
Ans: B
39:-The flux density of a coil can be increased by inserting a __________.
A:-Brass core
B:-Iron core
C:-Rubber core
D:-Plastic core
Ans: B
40:-The frequency of induced emf in an AC generator is given by ___________.
A:-120/PN
B:-120P/N
C:-PN/120
D:-120N/P
Ans: C
41:-A charged capacitor acts like a ____________.
A:-Temporary voltage source
B:-Magnetic energy source
C:-Constant current source
D:-Switch
Ans: A
42:-The relation between frequency of an AC signal (F) and time period (T) is __________.
A:-`"F=T^2"`
B:-F = 2T
C:-F = 1/T
D:-F = 1/2T
Ans: C
43:-A motor converts electrical energy into _____________.
A:-Magnetic energy
B:-Mechanical energy
C:-Potential energy
D:-Chemical energy
Ans: B
44:-When 2 inductors are in parallel, the effective value of inductance is given by LT = __________.
A:-L1 + L2
B:-L1 × L2/L1 + L2
C:-L1 × L2
D:-L1 + L2/L1 × L2
Ans: B
45:-A transformer is an electrical device used to __________.
A:-change the frequency of applied AC voltage
B:-transfer electrical energy from one circuit to another without any direct electrical connection
C:-convert applied DC into AC
D:-convert applied AC into DC
Ans: B
46:-A 3-phase transformer has ____________.
A:-1 primary and 3 secondary windings
B:-3 primary and 1 secondary windings
C:-3 primary and 3 secondary windings
D:-3 primary and 6 secondary windings
Ans: C
47:-A transformer has 800 turns in its primary winding and 200 in its secondary what is the primary voltage, if the secondary voltage is 40 V? Assume transformer losses as negligible?
A:-8 V
B:-16 V
C:-40 V
D:-160 V
Ans: D
48:-Efficiency of a transformer is the ratio of ___________.
A:-Output power to input power
B:-Input power to output power
C:-Input current to output current
D:-Output current to input current
Ans: A
49:-The basic unit of capacitance is ____________.
A:-Ohm
B:-Farad
C:-Henry
D:-Mho
Ans: B
50:-The relationship between charge (Q), voltage (V) and capacitance (C) of a capacitor is ____________.
A:-C = Q/V
B:-C = QV
C:-`"C=Q^2 V"`
D:-C = V/Q
Ans: A
51:-Identify the instrument which is NOT used for measurement of capacitance _________.
A:-Digital capacitance meter
B:-AC bridge
C:-RLC meter
D:-Kelvin bridge
Ans: D
A:-Neutrons
B:-Electrons
C:-Protons and neutrons combined together
D:-Valence electrons
Ans: B
22:-The most commonly used electrical conductor is ___________.
A:-Lead
B:-Tin
C:-Brass
D:-Copper
Ans: D
23:-The opposition offered to the movement of electrons/current flow is known as __________.
A:-Electric resistance
B:-Current
C:-Voltage
D:-None of these
Ans: A
24:-In a meter one main scale division is 5 volts, and it is divided into 10 small scale divisions. The meter can measure a minimum voltage of _____________.
A:-5 V
B:-0.5 V
C:-0.1 V
D:-1 V
Ans: B
25:-As the field intensity (H) in the core is increased, the flux density (B) ___________.
A:-Increases
B:-Decreases
C:-Becomes zero
D:-Does not change
Ans: A
26:-Material which can be strongly magnetised are known as ____________ materials.
A:-Paramagnetic
B:-Diamagnetic
C:-Ferro magnetic
D:-Pure magnet
Ans: C
27:-What material is used for making armature core?
A:-Silicon steel
B:-Aluminium
C:-Copper
D:-Mild steel
Ans: A
28:-The speed of a universal motor ____________.
A:-Remains constant to the applied load
B:-Is directly proportional to the applied load
C:-Is inversely proportional to the applied load
D:-Becomes zero when load is applied
Ans: C
29:-The basic unit of inductance is ___________.
A:-Farad
B:-Webber
C:-Henry
D:-Hertz
Ans: C
30:-Inductive reactance of a coil is directly proportional to the ___________.
A:-Alternating current following through it
B:-Induced emf in it
C:-Frequency of AC flowing through it
D:-All the parameters mentioned at A, B and C
Ans: D
31:-Two capacitors C1 = 1 nf and C2 = 10 nf, are connected in series and applied to the battery voltage V = 11 V. What are the voltages across the capacitors?
A:-VC1 = 5.5 V; VC2 = 5.5 V
B:-VC1 = 10 V; VC2 = 1 V
C:-VC1 = 1 V; VC2 = 10 V
D:-VC1 = 0 V; VC2 = 11 V
Ans: B
32:-Mutual induction is obtained by placing two current carrying coils ___________.
A:-Side by side close to each other
B:-Perpendicular to each other
C:-Far away from each other
D:-Both (1) and (2) above
Ans: A
33:-The fundamental unit of measurement of resistance is ____________.
A:-Ohm
B:-Milli ohm
C:-Kilo ohm
D:-Mega ohm
Ans: A
34:-For measuring unknown resistance, initially choose ____________.
A:-The highest ohms range
B:-The lowest ohms range
C:-Any ohms range
D:-R × 10 ohms range
Ans: A
35:-When three resistors R1, R2 and R3 are connected in series, the total resistance `"R_T" =`
A:-R1 + R2 + R3
B:-R1 × R2 × R3
C:-1/R1 + 1/R2 + 1/R3
D:-1/R1 × 1/R2 × 1/R3
Ans: A
36:-Magnetic lines are concentrated at ___________.
A:-At the centre of magnet
B:-Any one end of the magnet
C:-Along the magnet uniformly
D:-Both the ends of the magnet
Ans: D
37:-Generation and distribution of AC power in India is normally ___________.
A:-Single phase
B:-3 phase
C:-2 phase
D:-Either 2 phase or 3 phase
Ans: B
38:-The principle of operation of universal motor, similar to __________.
A:-DC shunt motor
B:-DC series motor
C:-DC short-shunt compound motor
D:-DC long-shunt compound motor
Ans: B
39:-The flux density of a coil can be increased by inserting a __________.
A:-Brass core
B:-Iron core
C:-Rubber core
D:-Plastic core
Ans: B
40:-The frequency of induced emf in an AC generator is given by ___________.
A:-120/PN
B:-120P/N
C:-PN/120
D:-120N/P
Ans: C
41:-A charged capacitor acts like a ____________.
A:-Temporary voltage source
B:-Magnetic energy source
C:-Constant current source
D:-Switch
Ans: A
42:-The relation between frequency of an AC signal (F) and time period (T) is __________.
A:-`"F=T^2"`
B:-F = 2T
C:-F = 1/T
D:-F = 1/2T
Ans: C
43:-A motor converts electrical energy into _____________.
A:-Magnetic energy
B:-Mechanical energy
C:-Potential energy
D:-Chemical energy
Ans: B
44:-When 2 inductors are in parallel, the effective value of inductance is given by LT = __________.
A:-L1 + L2
B:-L1 × L2/L1 + L2
C:-L1 × L2
D:-L1 + L2/L1 × L2
Ans: B
45:-A transformer is an electrical device used to __________.
A:-change the frequency of applied AC voltage
B:-transfer electrical energy from one circuit to another without any direct electrical connection
C:-convert applied DC into AC
D:-convert applied AC into DC
Ans: B
46:-A 3-phase transformer has ____________.
A:-1 primary and 3 secondary windings
B:-3 primary and 1 secondary windings
C:-3 primary and 3 secondary windings
D:-3 primary and 6 secondary windings
Ans: C
47:-A transformer has 800 turns in its primary winding and 200 in its secondary what is the primary voltage, if the secondary voltage is 40 V? Assume transformer losses as negligible?
A:-8 V
B:-16 V
C:-40 V
D:-160 V
Ans: D
48:-Efficiency of a transformer is the ratio of ___________.
A:-Output power to input power
B:-Input power to output power
C:-Input current to output current
D:-Output current to input current
Ans: A
49:-The basic unit of capacitance is ____________.
A:-Ohm
B:-Farad
C:-Henry
D:-Mho
Ans: B
50:-The relationship between charge (Q), voltage (V) and capacitance (C) of a capacitor is ____________.
A:-C = Q/V
B:-C = QV
C:-`"C=Q^2 V"`
D:-C = V/Q
Ans: A
51:-Identify the instrument which is NOT used for measurement of capacitance _________.
A:-Digital capacitance meter
B:-AC bridge
C:-RLC meter
D:-Kelvin bridge
Ans: D
52:-The capacitive reactance Xc is given by __________.
A:-2`Pi`FC
B:-1/2`Pi`FC
C:-2`Pi`/FC
D:-FC/2`Pi`
Ans: B
53:-Current flowing through a capacitor is given by ___________.
A:-`"V.X_c"`
B:-`"V^2/X_c"`
C:-`"V/X_c"`
D:-`"V^2.C"`
Ans: C
54:-A semi conductor in its pure form is referred to as __________.
A:-Intrinsic semiconductor
B:-Extrinsic semiconductor
C:-Crystal semiconductor
D:-Doped semiconductor
Ans: A
55:-The process of adding impurities to a pure semiconductor __________.
A:-Diffusion
B:-Forming
C:-Etching
D:-Doping
Ans: D
56:-The potential difference across a PN junction is referred to as _________.
A:-Potential difference
B:-Barrier potential
C:-Reverse potential
D:-PN potential
Ans: B
57:-When a germanium diode is connected in forward biased mode the voltage across the diode will be ___________.
A:-0.7 V
B:-0.3 V
C:-Is equal to applied voltage
D:-0 V
Ans: B
58:-When a diode is tested using an ohm meter. It indicates the low resistance in both direction. The condition of
the diode is ___________.
A:-Open
B:-Short
C:-Leaky
D:-Good
Ans: B
59:-A forward biased diode starts conducting when the applied voltage reaches certain voltage known as
____________.
A:-End-in voltage
B:-Barrier voltage
C:-Peak voltage
D:-Saturation voltage
Ans: B
60:-What value of the voltage is obtained directly from the wave form shown on a C.R.O when connected across the secondary of a transformer?
A:-Peak value
B:-R.M.S. value
C:-Peak-to-peak value
D:-Average value
Ans: C
61:-The main component used in a ripple filter circuit is the ___________.
A:-Capacitor
B:-Resistor
C:-Diode
D:-Transformer
Ans: A
62:-The maximum forward current of an LED is about ____________.
A:-10 mA
B:-50 mA
C:-.5 A
D:-1.0 A
Ans: B
63:-Which colour LED has the lowest forward voltage drop?
A:-Red
B:-Orange
C:-Green
D:-Yellow
Ans: A
64:-The time taken for etching PCB is in the range of ___________.
A:-5 to 20 minutes
B:-20 to 40 minutes
C:-1 to 2 hours
D:-More than 2 hour
Ans: A
65:-The PCB side on which components are mounted is referred to as ___________.
A:-Copper side
B:-Component side
C:-Solder side
D:-Track side
Ans: B
66:-The chemical used for removing copper from copper clad boards is called __________.
A:-Thinner
B:-Remover
C:-Eraser
D:-Etchant
Ans: D
67:-In amplifiers, transistors are used for ___________.
A:-Enlarging small electronic signals
B:-Switching purposes
C:-Reducing electronic signals
D:-Both the purposes mentioned in (1) and (2)
Ans: A
68:-A transistor can be thought of as two PN junction diodes connected as ____________.
A:-PNPN
B:-PNNP
C:-NPNP
D:-NNPP
Ans: B
69:-The advantage of transistors over vacuum tubes is ____________.
A:-Very small size
B:-Minimum power loss in the form of heat
C:-Low operating voltage
D:-All the three, mentioned above
Ans: D
70:-NPN transistors are preferred to PNP transistors for ___________.
A:-Higher switching speed
B:-Easy use in +ve supply rail
C:-A wide range of operating temperature
D:-The reasons mentioned in (1) and (2)
Ans: A
71:-Small signal amplifiers are also known as ___________.
A:-Large power amplifiers
B:-Medium power amplifiers
C:-Low power amplifiers
D:-Both medium power and low power amplifiers
Ans: C
72:-In transistors, the width of the collector layer is __________.
A:-Much less than the base region
B:-Much wider than the base region
C:-Much less than the emitter region
D:-Same as that of the base region
Ans: B
73:-The resistance measured by a multimeter between the anode and the cathode of good SCR should be ____________.
A:-Low
B:-Medium
C:-High
D:-Infinity
Ans: D
74:-In speed control circuits for DC motors using two SCR's _____________.
A:-Each SCR conducts at any time
B:-One SCR conducts in positive half cycle and the other in negative half cycle
C:-Both SCR's conduct at a time
D:-Only one SCR conducts and the other does not conduct
Ans: B
75:-Most common application of UJT is ____________.
A:-Schmitt trigger
B:-Bistable multivibrator
C:-Relaxation oscillator
D:-Timer
Ans: C
76:-DIAC is basically ____________.
A:-A PNP/NPN transistor
B:-A PNP/NPN transistor with no base connection
C:-A 4 layered NPNP device
D:-None of the above
Ans: B
77:-The speed of an AC motor can be controlled by using ____________.
A:-SCR
B:-TRIAC
C:-DIAC with SCR
D:-DIAC with TRIAC
Ans: D
78:-A power MOSFET is capable to handle current upto ___________.
A:-1 A
B:-50 A
C:-10 A
D:-100 A
Ans: D
79:-An IGBT is a hybrid form of ____________.
A:-A diode and a transistor
B:-A transistor and SCR
C:-A bipolar transistor and a MOSFET
D:-A FET and a MOSFET
Ans: C
80:-MOSFET's are used in ______________.
A:-Inverters
B:-SMPS
C:-UPS
D:-All the above
Ans: D
A:-2`Pi`FC
B:-1/2`Pi`FC
C:-2`Pi`/FC
D:-FC/2`Pi`
Ans: B
53:-Current flowing through a capacitor is given by ___________.
A:-`"V.X_c"`
B:-`"V^2/X_c"`
C:-`"V/X_c"`
D:-`"V^2.C"`
Ans: C
54:-A semi conductor in its pure form is referred to as __________.
A:-Intrinsic semiconductor
B:-Extrinsic semiconductor
C:-Crystal semiconductor
D:-Doped semiconductor
Ans: A
55:-The process of adding impurities to a pure semiconductor __________.
A:-Diffusion
B:-Forming
C:-Etching
D:-Doping
Ans: D
56:-The potential difference across a PN junction is referred to as _________.
A:-Potential difference
B:-Barrier potential
C:-Reverse potential
D:-PN potential
Ans: B
57:-When a germanium diode is connected in forward biased mode the voltage across the diode will be ___________.
A:-0.7 V
B:-0.3 V
C:-Is equal to applied voltage
D:-0 V
Ans: B
58:-When a diode is tested using an ohm meter. It indicates the low resistance in both direction. The condition of
the diode is ___________.
A:-Open
B:-Short
C:-Leaky
D:-Good
Ans: B
59:-A forward biased diode starts conducting when the applied voltage reaches certain voltage known as
____________.
A:-End-in voltage
B:-Barrier voltage
C:-Peak voltage
D:-Saturation voltage
Ans: B
60:-What value of the voltage is obtained directly from the wave form shown on a C.R.O when connected across the secondary of a transformer?
A:-Peak value
B:-R.M.S. value
C:-Peak-to-peak value
D:-Average value
Ans: C
61:-The main component used in a ripple filter circuit is the ___________.
A:-Capacitor
B:-Resistor
C:-Diode
D:-Transformer
Ans: A
62:-The maximum forward current of an LED is about ____________.
A:-10 mA
B:-50 mA
C:-.5 A
D:-1.0 A
Ans: B
63:-Which colour LED has the lowest forward voltage drop?
A:-Red
B:-Orange
C:-Green
D:-Yellow
Ans: A
64:-The time taken for etching PCB is in the range of ___________.
A:-5 to 20 minutes
B:-20 to 40 minutes
C:-1 to 2 hours
D:-More than 2 hour
Ans: A
65:-The PCB side on which components are mounted is referred to as ___________.
A:-Copper side
B:-Component side
C:-Solder side
D:-Track side
Ans: B
66:-The chemical used for removing copper from copper clad boards is called __________.
A:-Thinner
B:-Remover
C:-Eraser
D:-Etchant
Ans: D
67:-In amplifiers, transistors are used for ___________.
A:-Enlarging small electronic signals
B:-Switching purposes
C:-Reducing electronic signals
D:-Both the purposes mentioned in (1) and (2)
Ans: A
68:-A transistor can be thought of as two PN junction diodes connected as ____________.
A:-PNPN
B:-PNNP
C:-NPNP
D:-NNPP
Ans: B
69:-The advantage of transistors over vacuum tubes is ____________.
A:-Very small size
B:-Minimum power loss in the form of heat
C:-Low operating voltage
D:-All the three, mentioned above
Ans: D
70:-NPN transistors are preferred to PNP transistors for ___________.
A:-Higher switching speed
B:-Easy use in +ve supply rail
C:-A wide range of operating temperature
D:-The reasons mentioned in (1) and (2)
Ans: A
71:-Small signal amplifiers are also known as ___________.
A:-Large power amplifiers
B:-Medium power amplifiers
C:-Low power amplifiers
D:-Both medium power and low power amplifiers
Ans: C
72:-In transistors, the width of the collector layer is __________.
A:-Much less than the base region
B:-Much wider than the base region
C:-Much less than the emitter region
D:-Same as that of the base region
Ans: B
73:-The resistance measured by a multimeter between the anode and the cathode of good SCR should be ____________.
A:-Low
B:-Medium
C:-High
D:-Infinity
Ans: D
74:-In speed control circuits for DC motors using two SCR's _____________.
A:-Each SCR conducts at any time
B:-One SCR conducts in positive half cycle and the other in negative half cycle
C:-Both SCR's conduct at a time
D:-Only one SCR conducts and the other does not conduct
Ans: B
75:-Most common application of UJT is ____________.
A:-Schmitt trigger
B:-Bistable multivibrator
C:-Relaxation oscillator
D:-Timer
Ans: C
76:-DIAC is basically ____________.
A:-A PNP/NPN transistor
B:-A PNP/NPN transistor with no base connection
C:-A 4 layered NPNP device
D:-None of the above
Ans: B
77:-The speed of an AC motor can be controlled by using ____________.
A:-SCR
B:-TRIAC
C:-DIAC with SCR
D:-DIAC with TRIAC
Ans: D
78:-A power MOSFET is capable to handle current upto ___________.
A:-1 A
B:-50 A
C:-10 A
D:-100 A
Ans: D
79:-An IGBT is a hybrid form of ____________.
A:-A diode and a transistor
B:-A transistor and SCR
C:-A bipolar transistor and a MOSFET
D:-A FET and a MOSFET
Ans: C
80:-MOSFET's are used in ______________.
A:-Inverters
B:-SMPS
C:-UPS
D:-All the above
Ans: D
81:-LED
A:-is usually made from Ge
B:-Uses a reverse biased junction
C:-Emits light due to recombination of holes and electrons
D:-Gives light output which increases with increase in temperature
Ans: C
82:-SPST, SPDT, DPDT and DPST are
A:-Solid state relays
B:-Input-output interface modules
C:-Solid state switches
D:-Electrical relay contact types
Ans: D
83:-The 8 bit micro controller has
A:-Data bus of 8 bits
B:-Address bus of 8 bits
C:-8K ROM
D:-Both data and address bus 8 bits
Ans: A
84:-The additional features of 3G that are not available with 2G are
i) Mobile TV
ii) MMS
iii) Video transfers
iv) GPS
A:-i, ii, iii
B:-i, iii, iv
C:-ii, iii, iv
D:-i, ii, iii, iv
Ans: B
85:-5Ah in an UPS battery specification means
A:-5A for 1 hour
B:-1A for 5 hours
C:-The output power is 5 watts
D:-It requires 5 hours to charge fully
Ans: A
86:-The 43-grade cement means that the compressive strength of the cement mortar cube after 28 days is
A:-43 GPa
B:-43 Pa
C:-43 MPa
D:-None of the above
Ans: C
87:-The process of establishing intermediate points on a survey line joining the end points is called
A:-Chaining
B:-Ranging
C:-Pacing
D:-Surveying
Ans: B
88:-Choice of type of foundation depends on
A:-Soil type
B:-Super imposed load
C:-Material used
D:-All the above
Ans: D
89:-The following one is an example of electronic distance meter
A:-Total station
B:-Distomat
C:-Electronic theodolite
D:-Tacheometer
Ans: B
90:-The manufacturing process of concrete is in the following order
A:-Proportioning, batching, mixing, transporting, placing, compacting and curing
B:-Proportioning, mixing, batching, transporting, placing, compacting and curing
C:-Proportioning, mixing, batching, transporting, placing, curing and compacting
D:-Proportioning, transporting, mixing, batching, placing, compacting and curing
Ans: A
91:-In a four stroke cycle engine, the cam shaft completes
A:-Half the revolution of crank shaft
B:-Twice the revolutions of crank shaft
C:-The same revolutions as crank shaft
D:-Revolutions irrespective of crank shaft revolutions
Ans: A
92:-The thermal efficiency of a four stroke petrol engine as compared to two stroke petrol engine is
A:-Less
B:-More
C:-Same for same speed
D:-Same for same compression ratio
Ans: B
93:-While starting the engine, the pinion gear of the starter motor meshes with
A:-Fly wheel ring gear
B:-Gears in gear box
C:-Gears in differential
D:-None of these
Ans: A
94:-Rankine cycle consists of
A:-Two isothermal processes and two constant pressure processes
B:-Two isothermal processes and two constant volume processes
C:-Two isentropic processes and two constant volume processes
D:-Two isentropic processes and two constant pressure processes
Ans: D
95:-The correct order of the path of flue gas is
A:-superheater, economiser, precipitator, air preheater
B:-superheater, precipitator, economiser, air preheater
C:-superheater, economiser, air heater, precipitator
D:-superheater, air preheater, economiser, precipitator
Ans: C
96:-A DC source is supplying two resistors connected in parallel. If `R_(1)` = `2R_(2)`, determine the relation between the power dissipated in them
A:-`P_(1)` =`0.5 P_(2)`
B:-`P_(1)` =`P_(2)`
C:-`P_(1)` =`2 P_(2)`
D:-`P_(1)` =` ` `4 P_(2)`
Ans: A
97:-If an ac voltage source of magnitude 100`sqrt(2)` sinwt is causing a current flow of 10 sin (wt-45) A, determine the load.
A:-10+j10Ω
B:-10-j10Ω
C:-10`sqrt(2)` +j10`sqrt(2)`Ω
D:-10`sqrt(2)` -j10`sqrt(2)`Ω
Ans: A
98:-Which one among the following is not an over voltage protective system ?
A:-Lightning arrester
B:-Arcing horn
C:-Surge arrestor
D:-Earth-leakage circuit breaker
Ans: D
99:-If a dielectric slab of thickness 't' relative permeability of 2 is inserted between the parallel plates of an air capacitor, the capacitance of the new arrangement will
A:-Not change
B:-Decrease
C:-Increase
D:-Become zero
Ans: C
100:-Which one among the following is not a transmission voltage in Kerala ?
A:-33 kV
B:-55 kV
C:-220 kV
D:-400 kV
Ans: B
A:-is usually made from Ge
B:-Uses a reverse biased junction
C:-Emits light due to recombination of holes and electrons
D:-Gives light output which increases with increase in temperature
Ans: C
82:-SPST, SPDT, DPDT and DPST are
A:-Solid state relays
B:-Input-output interface modules
C:-Solid state switches
D:-Electrical relay contact types
Ans: D
83:-The 8 bit micro controller has
A:-Data bus of 8 bits
B:-Address bus of 8 bits
C:-8K ROM
D:-Both data and address bus 8 bits
Ans: A
84:-The additional features of 3G that are not available with 2G are
i) Mobile TV
ii) MMS
iii) Video transfers
iv) GPS
A:-i, ii, iii
B:-i, iii, iv
C:-ii, iii, iv
D:-i, ii, iii, iv
Ans: B
85:-5Ah in an UPS battery specification means
A:-5A for 1 hour
B:-1A for 5 hours
C:-The output power is 5 watts
D:-It requires 5 hours to charge fully
Ans: A
86:-The 43-grade cement means that the compressive strength of the cement mortar cube after 28 days is
A:-43 GPa
B:-43 Pa
C:-43 MPa
D:-None of the above
Ans: C
87:-The process of establishing intermediate points on a survey line joining the end points is called
A:-Chaining
B:-Ranging
C:-Pacing
D:-Surveying
Ans: B
88:-Choice of type of foundation depends on
A:-Soil type
B:-Super imposed load
C:-Material used
D:-All the above
Ans: D
89:-The following one is an example of electronic distance meter
A:-Total station
B:-Distomat
C:-Electronic theodolite
D:-Tacheometer
Ans: B
90:-The manufacturing process of concrete is in the following order
A:-Proportioning, batching, mixing, transporting, placing, compacting and curing
B:-Proportioning, mixing, batching, transporting, placing, compacting and curing
C:-Proportioning, mixing, batching, transporting, placing, curing and compacting
D:-Proportioning, transporting, mixing, batching, placing, compacting and curing
Ans: A
91:-In a four stroke cycle engine, the cam shaft completes
A:-Half the revolution of crank shaft
B:-Twice the revolutions of crank shaft
C:-The same revolutions as crank shaft
D:-Revolutions irrespective of crank shaft revolutions
Ans: A
92:-The thermal efficiency of a four stroke petrol engine as compared to two stroke petrol engine is
A:-Less
B:-More
C:-Same for same speed
D:-Same for same compression ratio
Ans: B
93:-While starting the engine, the pinion gear of the starter motor meshes with
A:-Fly wheel ring gear
B:-Gears in gear box
C:-Gears in differential
D:-None of these
Ans: A
94:-Rankine cycle consists of
A:-Two isothermal processes and two constant pressure processes
B:-Two isothermal processes and two constant volume processes
C:-Two isentropic processes and two constant volume processes
D:-Two isentropic processes and two constant pressure processes
Ans: D
95:-The correct order of the path of flue gas is
A:-superheater, economiser, precipitator, air preheater
B:-superheater, precipitator, economiser, air preheater
C:-superheater, economiser, air heater, precipitator
D:-superheater, air preheater, economiser, precipitator
Ans: C
96:-A DC source is supplying two resistors connected in parallel. If `R_(1)` = `2R_(2)`, determine the relation between the power dissipated in them
A:-`P_(1)` =`0.5 P_(2)`
B:-`P_(1)` =`P_(2)`
C:-`P_(1)` =`2 P_(2)`
D:-`P_(1)` =` ` `4 P_(2)`
Ans: A
97:-If an ac voltage source of magnitude 100`sqrt(2)` sinwt is causing a current flow of 10 sin (wt-45) A, determine the load.
A:-10+j10Ω
B:-10-j10Ω
C:-10`sqrt(2)` +j10`sqrt(2)`Ω
D:-10`sqrt(2)` -j10`sqrt(2)`Ω
Ans: A
98:-Which one among the following is not an over voltage protective system ?
A:-Lightning arrester
B:-Arcing horn
C:-Surge arrestor
D:-Earth-leakage circuit breaker
Ans: D
99:-If a dielectric slab of thickness 't' relative permeability of 2 is inserted between the parallel plates of an air capacitor, the capacitance of the new arrangement will
A:-Not change
B:-Decrease
C:-Increase
D:-Become zero
Ans: C
100:-Which one among the following is not a transmission voltage in Kerala ?
A:-33 kV
B:-55 kV
C:-220 kV
D:-400 kV
Ans: B
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