ELECTRICAL AND ELECTRONICS ENGINEERING
ELECTRICAL AND ELECTRONICS ENGINEERING MCQs
1. The input voltage, current and power to a balanced 3-phase system is measured as 415 V, 16.4 A and 6 kW respectively. The power factor of the system is approximately :
(A) 1 (B) 0.8 (C) 0.9 (D) 0.5
Ans: D
2.Two wire A and B of the same material and length I and 2l have radius r and Zr respectively, the ratio of their specific resistance will be A:-1:1
B:-1:2
C:-1:4
D:-1:8
Ans: A
3. A fuel cell, in order to produce electricity, burns :
(A) Carbon (B) Hydrogen (C) Nitrogen (D) Helium
Ans: B
4. The most nuclear fuel used in the world is :
(A) Thorium-232 (B) Uranium-238 (C) Uranium-235 (D) Plutonium-239
Ans: C
5. If the supply frequency to the transformer is increased, the iron loss will :
(A) Not change (B) Decreases (C) Increase (D) Any of the above
Ans: C
6. The transformer ratings are usually expressed in :
(A) Volts (B) Amperes (C) kW (D) kVA
Ans: D
7. Buchholz’s relay gives warning and protection against :
(A) Fault inside transformer (B) Fault outside transformer (C) For both outside and inside (D) None of the above
Ans: A
8. The ratio of starting torque to full load torque is least in :
(A) Shunt motor (B) Series motor (C) Differential compound motor (D) Cumulative compound motor
Ans: C
9:-Across the surface of a charged conductor, the electric
A:-the field is continuous B:-potentia| is discontinuous
C:-field is discontinuous D:-none of the above
Ans: C
10. Three 100 Ω resistances are connected in delta across 400 V, 50 Hz, 3-phase line. If one of the resistor is disconnected, the power taken by the load is :
(A) 3.2 kW (B) 4.8 kW (C) 2.7 kW (D) 5.54 kW
Ans: A
11. Two equal resistance are connected in series across a constant voltage source the total power consumed is P. If the same resistance are connected in parallel the new total power is given by :
(A) 4 P (B) 2 P (C) P/2 (D) P/4
Ans: A
12. When the charge on a capacitor is doubled, the energy stored, :
(A) increases by a factor of 2 (B) increases by a factor of 4 (C) decreases by a factor of 4 (D) remains the same
Ans: B
13. The axial field strength of a solenoid increases :
(A) with increase its length (B) independent of length (C) with decrease in length (D) decrease in number of turns
Ans: C
14. Aluminium can be classified as a :
(A) Soft magnetic material (B) Diamagnetic material (C) Paramagnetic material (D) Ferromagnetic material
Ans: C
15. Two long single layer solenoids have the same length and same number of turns but are placed co-axially one within other. The diameter of inner coil is 4 cm and that of outer coil is 8 cm. The coefficient of coupling between the coils is :
(A) 0.5 (B) 0.2 (C) 0.6 (D) 0.12
Ans: A
16. Salient poles alternators are generally used on :
(A) Low speed prime movers only (B) High speed prime movers only
(C) Medium speed prime movers only (D) Low and medium speed prime movers
Ans: D
17. The main disadvantage of using short-pitch winding in alternators is that it :
(A) Reduces harmonics in the generated voltage (B) Reduces the total voltage around the armature coils
(C) Produces asymmetry in the three phase windings (D) Increases Cu of end connections
Ans: B
18. For resistance measurement using a digital multimeter, it contains :
(A) High voltage source (B) Low current source (C) High resistance (D) Low capacitance
Ans: B
19. When a p-n junction is reverse biased, :
(A) holes and electrons move towards the junction (B) holes and electrons move away from the junction
(C) movement of holes and electrons are seized (D) width of depletion region decreases
Ans: B
20. The type of output generated in a thermocouple sensor is :
(A) Current (B) Voltage (C) Resistance (D) Capacitance
Ans: B
21. Pressure can be measured using :
(A) Venturimeter (B) Differential pressure transmitter (C) Potentiometer (D) Manometer
Ans: D
22. GPRS stands for :
(A) Global Parallel Radio Service (B) Guided Public Radio Service (C) General Packet Radio Service (D) None of the above
Ans: C
23. Bluetooth operates around the frequency :
(A) 4.8 GHz (B) 4.8 MHz (C) 2.4 MHz (D) 2.4 GHz
Ans: D
24. An ideal insulating material should have low
A:-insulation resistance B:-die|ectric strength
C:-dielectric loss angle D:-mechanical strength
Ans: C
25. A zener diode with high breakdown voltage has :
(A) both p and n regions are lightly doped (B) both p and n regions are heavily doped
(C) either p or n regions is lightly doped (D) none of the above
Ans: A
26. In a zener diode, the current is controlled by :
(A) potential barrier (B) reverse bias voltage (C) external circuits (D) zener diode resistance
Ans: C
27. Type of microphone which converts acoustic signals to change in capacitance is :
(A) Condenser microphone (B) Ribbon microphone (C) Dynamic microphone (D) Omni microphone
Ans: A
28. For a parallel plate capacitor with circular cross section, if the radius of the plate surface is halved, then the capacitance value :
(A) reduces by a factor of 2 (B) reduces by a factor of 4
(C) increases by a factor of 2 (D) increases by a factor of 4
Ans: B
29. AC voltages are measured using a digital multimeter using :
(A) Capacitor and Resistors (B) Inductor and Resistors (C) Rectifiers and Filters (D) Oscillator and Amplifiers
Ans: C
30. Material used for making solar cells is :
(A) Germanium (B) Silicon (C) Silver (D) Aluminium
Ans: B
31. If an amplifier produces an output power 10 times greater than its input power, what will be the gain in decibels?
(A) 3 dB (B) 6 dB (C) 10 dB (D) 20 dB
Ans: C
32:-Which is the necessary condition for generating sinusoidal voltage in a feedback type oscillator
A:-Tota| loop gain should be one
B:-Tota| phase shift should be 360° or 0°
C:-Either A or B
D:-Both A and B
Ans: D
33:-The binary equivalent of the Hexadecimal number ‘(18)_(16) is‘
A:-00010010b B:-00010011b C:-10000010b D:-00011000b
Ans: D
34:-The output of a logic gate is "1" when all its inputs are at logic "0", the gate is
A:-A NOR or an EX-OR gate
B:-A NAND or OR gate
C:-An AND or an EX-NOR gate
D:-None of above
Ans: D
35:-If a mod 9 counter is constructed using 4 flip flops the counter will skip
A:-7 Counts B:-8 Counts C:-9 Counts D:-none of the above
Ans: A
36:-The two input OR gate is
A:-7400 B:-7483 C:-7432 D:-7423
Ans: C
37:-Which of the following statement about RAM is not correct
A:-It stands for Random Access Memory
B:-|t is R/W memory
C:-It is volatile memory
D:-The data's are entered or stored in the chip during manufacturing
Ans: D
38:-The PIV of diode in a half wave rectifier circuit with shunt capacitor filter is
A:-2Vm B:-Vm C:-Vm/2 D:-3Vm
Ans: A
39:-The number of comparators required in a 3 bit comparator type ADC is
A:-6 B:-7 C:-3 D:-8
Ans: B
40:-The rotor of a stepper motor has no
A:-Windings B:-Commutator C:-Brushes D:-All of these
Ans: D
41:-Which method of speed control cannot be used in a permanent magnet dc motor
A:-Armature voltage variation B:-Armature resistance control
C:-Varying the field current D:-All of the above
Ans: C
42:-Which test on a transformer provides information about regulation, efficiency and heading under load conditions.
A:-open circuit test B:-short circuit test C:-Hopkinsons test D:-back to back test
Ans: D
43:-In a transformer the resistance between primary and secondary must be
A:-zero B:-1 kQ C:-100 kQ D:-infinite
Ans: D
44:-V curves for a synchronous motor represent relation between
A:-fie|d current and speed B:-fie|d current and power factor
C:-Armature current & field current D:-Power factor and speed
Ans: C
45:-An induction motor is expected to take largest starting current under which method of starting
A:-Direct online starting B:-Starter-rotor starting
C:-star-delta starting D:-Auto-transformer starting
Ans: A
46:-A synchronous motor is found to be more economical when the load is above
A:-1 kW B:-10 kW C:-20 kW D:-100 kW
Ans: D
47:-According to Indian Electricity rules, extra high voltage implies voltage exceeding.
A:-440 V
B:-650 V
C:-33 kV
D:-110kV
Ans: C
48:-The first type of variable speed drive ever used on lifts was the so-called
A:-Two speed system B:-Ward-Leonard system C:-DC SCR D:-VVVF
Ans: B
49:-What type of elevator is used for low rise buildings where speed is not the main consideration?
A:-Gear-|ess traction elevator B:-Geared elevator C:-Hydraulic D:-Deck elevator
Ans: C
50:-Which motors are invariably used in lift systems to achieve good starting torques and enable good speed control using variable voltage systems
A:-synchronous motor B:-Doub|e cage rotor induction motors
C:-dc series motor D:-dc compound motor
Ans: B
(A) 1 (B) 0.8 (C) 0.9 (D) 0.5
Ans: D
2.Two wire A and B of the same material and length I and 2l have radius r and Zr respectively, the ratio of their specific resistance will be A:-1:1
B:-1:2
C:-1:4
D:-1:8
Ans: A
3. A fuel cell, in order to produce electricity, burns :
(A) Carbon (B) Hydrogen (C) Nitrogen (D) Helium
Ans: B
4. The most nuclear fuel used in the world is :
(A) Thorium-232 (B) Uranium-238 (C) Uranium-235 (D) Plutonium-239
Ans: C
5. If the supply frequency to the transformer is increased, the iron loss will :
(A) Not change (B) Decreases (C) Increase (D) Any of the above
Ans: C
6. The transformer ratings are usually expressed in :
(A) Volts (B) Amperes (C) kW (D) kVA
Ans: D
7. Buchholz’s relay gives warning and protection against :
(A) Fault inside transformer (B) Fault outside transformer (C) For both outside and inside (D) None of the above
Ans: A
8. The ratio of starting torque to full load torque is least in :
(A) Shunt motor (B) Series motor (C) Differential compound motor (D) Cumulative compound motor
Ans: C
9:-Across the surface of a charged conductor, the electric
A:-the field is continuous B:-potentia| is discontinuous
C:-field is discontinuous D:-none of the above
Ans: C
10. Three 100 Ω resistances are connected in delta across 400 V, 50 Hz, 3-phase line. If one of the resistor is disconnected, the power taken by the load is :
(A) 3.2 kW (B) 4.8 kW (C) 2.7 kW (D) 5.54 kW
Ans: A
11. Two equal resistance are connected in series across a constant voltage source the total power consumed is P. If the same resistance are connected in parallel the new total power is given by :
(A) 4 P (B) 2 P (C) P/2 (D) P/4
Ans: A
12. When the charge on a capacitor is doubled, the energy stored, :
(A) increases by a factor of 2 (B) increases by a factor of 4 (C) decreases by a factor of 4 (D) remains the same
Ans: B
13. The axial field strength of a solenoid increases :
(A) with increase its length (B) independent of length (C) with decrease in length (D) decrease in number of turns
Ans: C
14. Aluminium can be classified as a :
(A) Soft magnetic material (B) Diamagnetic material (C) Paramagnetic material (D) Ferromagnetic material
Ans: C
15. Two long single layer solenoids have the same length and same number of turns but are placed co-axially one within other. The diameter of inner coil is 4 cm and that of outer coil is 8 cm. The coefficient of coupling between the coils is :
(A) 0.5 (B) 0.2 (C) 0.6 (D) 0.12
Ans: A
16. Salient poles alternators are generally used on :
(A) Low speed prime movers only (B) High speed prime movers only
(C) Medium speed prime movers only (D) Low and medium speed prime movers
Ans: D
17. The main disadvantage of using short-pitch winding in alternators is that it :
(A) Reduces harmonics in the generated voltage (B) Reduces the total voltage around the armature coils
(C) Produces asymmetry in the three phase windings (D) Increases Cu of end connections
Ans: B
18. For resistance measurement using a digital multimeter, it contains :
(A) High voltage source (B) Low current source (C) High resistance (D) Low capacitance
Ans: B
19. When a p-n junction is reverse biased, :
(A) holes and electrons move towards the junction (B) holes and electrons move away from the junction
(C) movement of holes and electrons are seized (D) width of depletion region decreases
Ans: B
20. The type of output generated in a thermocouple sensor is :
(A) Current (B) Voltage (C) Resistance (D) Capacitance
Ans: B
21. Pressure can be measured using :
(A) Venturimeter (B) Differential pressure transmitter (C) Potentiometer (D) Manometer
Ans: D
22. GPRS stands for :
(A) Global Parallel Radio Service (B) Guided Public Radio Service (C) General Packet Radio Service (D) None of the above
Ans: C
23. Bluetooth operates around the frequency :
(A) 4.8 GHz (B) 4.8 MHz (C) 2.4 MHz (D) 2.4 GHz
Ans: D
24. An ideal insulating material should have low
A:-insulation resistance B:-die|ectric strength
C:-dielectric loss angle D:-mechanical strength
Ans: C
25. A zener diode with high breakdown voltage has :
(A) both p and n regions are lightly doped (B) both p and n regions are heavily doped
(C) either p or n regions is lightly doped (D) none of the above
Ans: A
26. In a zener diode, the current is controlled by :
(A) potential barrier (B) reverse bias voltage (C) external circuits (D) zener diode resistance
Ans: C
27. Type of microphone which converts acoustic signals to change in capacitance is :
(A) Condenser microphone (B) Ribbon microphone (C) Dynamic microphone (D) Omni microphone
Ans: A
28. For a parallel plate capacitor with circular cross section, if the radius of the plate surface is halved, then the capacitance value :
(A) reduces by a factor of 2 (B) reduces by a factor of 4
(C) increases by a factor of 2 (D) increases by a factor of 4
Ans: B
29. AC voltages are measured using a digital multimeter using :
(A) Capacitor and Resistors (B) Inductor and Resistors (C) Rectifiers and Filters (D) Oscillator and Amplifiers
Ans: C
30. Material used for making solar cells is :
(A) Germanium (B) Silicon (C) Silver (D) Aluminium
Ans: B
31. If an amplifier produces an output power 10 times greater than its input power, what will be the gain in decibels?
(A) 3 dB (B) 6 dB (C) 10 dB (D) 20 dB
Ans: C
32:-Which is the necessary condition for generating sinusoidal voltage in a feedback type oscillator
A:-Tota| loop gain should be one
B:-Tota| phase shift should be 360° or 0°
C:-Either A or B
D:-Both A and B
Ans: D
33:-The binary equivalent of the Hexadecimal number ‘(18)_(16) is‘
A:-00010010b B:-00010011b C:-10000010b D:-00011000b
Ans: D
34:-The output of a logic gate is "1" when all its inputs are at logic "0", the gate is
A:-A NOR or an EX-OR gate
B:-A NAND or OR gate
C:-An AND or an EX-NOR gate
D:-None of above
Ans: D
35:-If a mod 9 counter is constructed using 4 flip flops the counter will skip
A:-7 Counts B:-8 Counts C:-9 Counts D:-none of the above
Ans: A
36:-The two input OR gate is
A:-7400 B:-7483 C:-7432 D:-7423
Ans: C
37:-Which of the following statement about RAM is not correct
A:-It stands for Random Access Memory
B:-|t is R/W memory
C:-It is volatile memory
D:-The data's are entered or stored in the chip during manufacturing
Ans: D
38:-The PIV of diode in a half wave rectifier circuit with shunt capacitor filter is
A:-2Vm B:-Vm C:-Vm/2 D:-3Vm
Ans: A
39:-The number of comparators required in a 3 bit comparator type ADC is
A:-6 B:-7 C:-3 D:-8
Ans: B
40:-The rotor of a stepper motor has no
A:-Windings B:-Commutator C:-Brushes D:-All of these
Ans: D
41:-Which method of speed control cannot be used in a permanent magnet dc motor
A:-Armature voltage variation B:-Armature resistance control
C:-Varying the field current D:-All of the above
Ans: C
42:-Which test on a transformer provides information about regulation, efficiency and heading under load conditions.
A:-open circuit test B:-short circuit test C:-Hopkinsons test D:-back to back test
Ans: D
43:-In a transformer the resistance between primary and secondary must be
A:-zero B:-1 kQ C:-100 kQ D:-infinite
Ans: D
44:-V curves for a synchronous motor represent relation between
A:-fie|d current and speed B:-fie|d current and power factor
C:-Armature current & field current D:-Power factor and speed
Ans: C
45:-An induction motor is expected to take largest starting current under which method of starting
A:-Direct online starting B:-Starter-rotor starting
C:-star-delta starting D:-Auto-transformer starting
Ans: A
46:-A synchronous motor is found to be more economical when the load is above
A:-1 kW B:-10 kW C:-20 kW D:-100 kW
Ans: D
47:-According to Indian Electricity rules, extra high voltage implies voltage exceeding.
A:-440 V
B:-650 V
C:-33 kV
D:-110kV
Ans: C
48:-The first type of variable speed drive ever used on lifts was the so-called
A:-Two speed system B:-Ward-Leonard system C:-DC SCR D:-VVVF
Ans: B
49:-What type of elevator is used for low rise buildings where speed is not the main consideration?
A:-Gear-|ess traction elevator B:-Geared elevator C:-Hydraulic D:-Deck elevator
Ans: C
50:-Which motors are invariably used in lift systems to achieve good starting torques and enable good speed control using variable voltage systems
A:-synchronous motor B:-Doub|e cage rotor induction motors
C:-dc series motor D:-dc compound motor
Ans: B
51:-|n terms of energy bands, semiconductors can be defined as those material which at room temperature have
A:-Partia||y filled conduction band B:-Partia||y filled valance band C:-A very narrow energy gap D:-All of the above
Ans: D
52:-In an N type semiconductor there are
A:-No minority carriers B:-Immobile negative ions C:-Immobile positive ions D:-ho|es as majority carriers
Ans: C
53:-A square wave oscillator is
A:-Bistab|e multivibrator B:-An Astable multivibrator
C:-A Monostable multivibrator D:-None of the above
Ans: B
54:-In a transistor the reverse saturation current ICo
A:-Doub|es for every 10°C rise in temperature
B:-Doub|es for every 1°C rise in temperature
C:-Increase linearly with temperature
D:-Doub|es for every 15°C rise in temperature
Ans: A
55:-An SCR can be turned OFF by
A:-Removing the gate voltage B:-Reducing the Anode to Cathode voltage
C:-Reducing the Anode current below the holding current D:-All of the above
Ans: C
56:-DIAC is a
A:-One terminal device B:-Two terminal device C:-Three terminal device D:-Four terminal device
Ans: B
57:-Which one of the following is not a characteristics of the UJT
A:-Negative resistance B:-|ntrinsic stand off ratio C:-Gate current D:-Peak point voltage
Ans: C
58:-A TRIAC can be triggered
A:-Only by the positive half cycle of the supply
B:-Only by the negative half cycle of the supply
C:-By positive & negative cycle of the supply
D:-None of the above
Ans: C
59:-The procedure used for controlling the speed of a 3 phase induction motor is
A:-Fixed voltage -variable frequency method
B:-variable voltage -fixed frequency method
C:-variable voltage -variable frequency method
D:-Fixed voltage -fixed frequency method
Ans: C
60:-The purpose of the synchronizing control in a CRO is to
A:-Focus the spot on screen B:-Adjust the amplitude of the display
C:-Control the intensity of spot D:-Lock the display of the signal
Ans: D
61:-In magnetic circuits, an air gap is usually inserted so as to
A:-increase in mmf B:-prevent saturation
C:-increase in flux D:-the increase in inductance
Ans: B
62:-An Electromagnetic field is radiated from a
A:-stationary point charge B:-a capacitor with the DC voltage
C:-a conductor carrying in a DC current D:-an oscillating dipole
Ans: D
63:-In a series RLC circuit, the maximum voltage across the capacitor occurs at a frequency
A:-doub|e the resonant frequency B:-below the resonant frequency
C:-1.414 times the resonant frequency D:-equa| to resonant frequency
Ans: B
64:-Wave winding is employed in a DC Machine of
A:-high current and low voltage rating B:-|ow current and high voltage rating
C:-high current and high voltage rating D:-|ow current and voltage rating
Ans: B
65:-The flux in transformer core
A:-increases with load B:-decreases with load
C:-remains constant irrespective of Load D:-none of the above
Ans: C
66:-In cylindrical Rotor ............ portion of the rotor is wound
A:-one third B:-two third C:-one half D:-whole
Ans: B
67:-Protection by fuses is generally not used beyond
A:-200 A B:-50 A
C:-25 A D:-10 A
Ans: A
68:-Aluminum conductor cables can be joined by
A:-gas welding B:-so|dering C:-compression D:-thermite welding
Ans: C
69:-Minimum distance of underground cable from the foundation of the building should be
A:-100 cm B:-50 cm C:-10 cm D:-5 cm
Ans: C
70:-Resolution of an instrument is
A:-the minimum quantity it can measure B:-the maximum quantity that can measure
C:-the maximum non linearity D:-abi|ity to distinguish polarity
Ans: A
71:-The response of a galvanometer is independent of its
A:-contro||ing torque B:-number of turns C:-circuit resistance D:-none of these
Ans: C
72:-A dynamometer type wattmeter response to the
A:-average value of active power B:-average value of reactive power
C:-peak value of active power D:-peak value of reactive power
Ans: A
73:-Permission for addition/alteration in the lift installation is granted in
A:-Form F B:-Form B C:-Form D D:-Form H
Ans: B
74:-The license for existing lift/escalator is issued in?
A:-Form F B:-Form B C:-Form D D:-Form H
Ans: A
75:-Motor used for elevators is generally
A:-synchronous motor B:-induction motor
C:-capacitor start single phase motor D:-any of the above
Ans: B
76:-The starting capacitor of a single phase motor is
A:-E|ectro|ytic capacitor B:-Ceramic capacitor C:-Paper capacitor D:-none of these
Ans: A
77:-An elevator drive is required to operate in
A:-One quadrant only B:-Two quadrant only
C:-Three quadrants only D:-Four quadrants only
Ans: D
A:-Partia||y filled conduction band B:-Partia||y filled valance band C:-A very narrow energy gap D:-All of the above
Ans: D
52:-In an N type semiconductor there are
A:-No minority carriers B:-Immobile negative ions C:-Immobile positive ions D:-ho|es as majority carriers
Ans: C
53:-A square wave oscillator is
A:-Bistab|e multivibrator B:-An Astable multivibrator
C:-A Monostable multivibrator D:-None of the above
Ans: B
54:-In a transistor the reverse saturation current ICo
A:-Doub|es for every 10°C rise in temperature
B:-Doub|es for every 1°C rise in temperature
C:-Increase linearly with temperature
D:-Doub|es for every 15°C rise in temperature
Ans: A
55:-An SCR can be turned OFF by
A:-Removing the gate voltage B:-Reducing the Anode to Cathode voltage
C:-Reducing the Anode current below the holding current D:-All of the above
Ans: C
56:-DIAC is a
A:-One terminal device B:-Two terminal device C:-Three terminal device D:-Four terminal device
Ans: B
57:-Which one of the following is not a characteristics of the UJT
A:-Negative resistance B:-|ntrinsic stand off ratio C:-Gate current D:-Peak point voltage
Ans: C
58:-A TRIAC can be triggered
A:-Only by the positive half cycle of the supply
B:-Only by the negative half cycle of the supply
C:-By positive & negative cycle of the supply
D:-None of the above
Ans: C
59:-The procedure used for controlling the speed of a 3 phase induction motor is
A:-Fixed voltage -variable frequency method
B:-variable voltage -fixed frequency method
C:-variable voltage -variable frequency method
D:-Fixed voltage -fixed frequency method
Ans: C
60:-The purpose of the synchronizing control in a CRO is to
A:-Focus the spot on screen B:-Adjust the amplitude of the display
C:-Control the intensity of spot D:-Lock the display of the signal
Ans: D
61:-In magnetic circuits, an air gap is usually inserted so as to
A:-increase in mmf B:-prevent saturation
C:-increase in flux D:-the increase in inductance
Ans: B
62:-An Electromagnetic field is radiated from a
A:-stationary point charge B:-a capacitor with the DC voltage
C:-a conductor carrying in a DC current D:-an oscillating dipole
Ans: D
63:-In a series RLC circuit, the maximum voltage across the capacitor occurs at a frequency
A:-doub|e the resonant frequency B:-below the resonant frequency
C:-1.414 times the resonant frequency D:-equa| to resonant frequency
Ans: B
64:-Wave winding is employed in a DC Machine of
A:-high current and low voltage rating B:-|ow current and high voltage rating
C:-high current and high voltage rating D:-|ow current and voltage rating
Ans: B
65:-The flux in transformer core
A:-increases with load B:-decreases with load
C:-remains constant irrespective of Load D:-none of the above
Ans: C
66:-In cylindrical Rotor ............ portion of the rotor is wound
A:-one third B:-two third C:-one half D:-whole
Ans: B
67:-Protection by fuses is generally not used beyond
A:-200 A B:-50 A
C:-25 A D:-10 A
Ans: A
68:-Aluminum conductor cables can be joined by
A:-gas welding B:-so|dering C:-compression D:-thermite welding
Ans: C
69:-Minimum distance of underground cable from the foundation of the building should be
A:-100 cm B:-50 cm C:-10 cm D:-5 cm
Ans: C
70:-Resolution of an instrument is
A:-the minimum quantity it can measure B:-the maximum quantity that can measure
C:-the maximum non linearity D:-abi|ity to distinguish polarity
Ans: A
71:-The response of a galvanometer is independent of its
A:-contro||ing torque B:-number of turns C:-circuit resistance D:-none of these
Ans: C
72:-A dynamometer type wattmeter response to the
A:-average value of active power B:-average value of reactive power
C:-peak value of active power D:-peak value of reactive power
Ans: A
73:-Permission for addition/alteration in the lift installation is granted in
A:-Form F B:-Form B C:-Form D D:-Form H
Ans: B
74:-The license for existing lift/escalator is issued in?
A:-Form F B:-Form B C:-Form D D:-Form H
Ans: A
75:-Motor used for elevators is generally
A:-synchronous motor B:-induction motor
C:-capacitor start single phase motor D:-any of the above
Ans: B
76:-The starting capacitor of a single phase motor is
A:-E|ectro|ytic capacitor B:-Ceramic capacitor C:-Paper capacitor D:-none of these
Ans: A
77:-An elevator drive is required to operate in
A:-One quadrant only B:-Two quadrant only
C:-Three quadrants only D:-Four quadrants only
Ans: D
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