ELECTRICAL ENGINEERING- PAGE 2
ELECTRICAL ENGINEERING MCQs- PAGE 2
1:-Which type of motor is generally used in a portable drilling machine ?
A:-Repulsion motor
B:-Universal motor
C:-Capacitor run motor
D:-Shaded pole motor
Ans: B
2:-Lead is prepared from the ore of :
A:-Bauxite
B:-Blast
C:-Hematite
D:-Galena
Ans: D
3:-Which of the material is used to fix the screw on concrete wall and ceiling ?
A:-Link clips
B:-Bushings
C:-Rowl plug
D:-Saddles
Ans: C
4:-Insulation resistance is measured in :
A:-Kilo ohms
B:-Mega ohms
C:-Megawatts
D:-Kilowatts
Ans: B
5:-In an energy meter the holes on the aluminum disc helps to :
A:-Reduce the friction
B:-Reduce the weight of the disc
C:-Prevent creeping
D:-Reduce the resistance
Ans: C
6:-Watt hour meter is classified as a :
A:-Integrating Instrument
B:-Deflecting Instrument
C:-Recording Instrument
D:-Indicating Instrument
Ans: A
7:-Efficiency of a Secondary cell is :
A:-Impedance hour efficiency
B:-Ampere hour efficiency
C:-Resistance hour efficiency
D:-Volt hour efficiency
Ans: B
8:-Which class of insulator is Mica ?
A:-Class F
B:-Class A
C:-Class B
D:-Class C
Ans: D
9:-The slip rings are made of :
A:-Aluminium
B:-Silver
C:-Copper
D:-Cast iron
Ans: C
10:-The operating temperature of a gas filled lamp is about __________.
A:-2500° C
B:-3000° C
C:-2000° C
D:-2700° C
Ans: D
11:-If the speed of DC shunt motor increases the back emf :
A:-Decreases
B:-Constant
C:-Decreases and then increases
D:-Increases
Ans: D
12:-To check the Internal and External radius of work pieces which tool is used ?
A:-Radius gauges
B:-Centre punch
C:-Scriber
D:-Callipers
Ans: A
13:-Universal Motor requires :
A:-AC only
B:-DC only
C:-AC and DC
D:-DC and shunt type
Ans: C
14:-All the sides of parallelogram are equal is called __________.
A:-Trapezium
B:-Rhombus
C:-Polygon
D:-Rectangle
Ans: B
15:-Gun Metal is an alloy of __________, __________ and __________.
A:-Copper, Aluminium, Zinc
B:-Copper, Tin, Zinc
C:-Iron, Copper, Tin
D:-Iron, Tin, Zinc
Ans: B
A:-Repulsion motor
B:-Universal motor
C:-Capacitor run motor
D:-Shaded pole motor
Ans: B
2:-Lead is prepared from the ore of :
A:-Bauxite
B:-Blast
C:-Hematite
D:-Galena
Ans: D
3:-Which of the material is used to fix the screw on concrete wall and ceiling ?
A:-Link clips
B:-Bushings
C:-Rowl plug
D:-Saddles
Ans: C
4:-Insulation resistance is measured in :
A:-Kilo ohms
B:-Mega ohms
C:-Megawatts
D:-Kilowatts
Ans: B
5:-In an energy meter the holes on the aluminum disc helps to :
A:-Reduce the friction
B:-Reduce the weight of the disc
C:-Prevent creeping
D:-Reduce the resistance
Ans: C
6:-Watt hour meter is classified as a :
A:-Integrating Instrument
B:-Deflecting Instrument
C:-Recording Instrument
D:-Indicating Instrument
Ans: A
7:-Efficiency of a Secondary cell is :
A:-Impedance hour efficiency
B:-Ampere hour efficiency
C:-Resistance hour efficiency
D:-Volt hour efficiency
Ans: B
8:-Which class of insulator is Mica ?
A:-Class F
B:-Class A
C:-Class B
D:-Class C
Ans: D
9:-The slip rings are made of :
A:-Aluminium
B:-Silver
C:-Copper
D:-Cast iron
Ans: C
10:-The operating temperature of a gas filled lamp is about __________.
A:-2500° C
B:-3000° C
C:-2000° C
D:-2700° C
Ans: D
11:-If the speed of DC shunt motor increases the back emf :
A:-Decreases
B:-Constant
C:-Decreases and then increases
D:-Increases
Ans: D
12:-To check the Internal and External radius of work pieces which tool is used ?
A:-Radius gauges
B:-Centre punch
C:-Scriber
D:-Callipers
Ans: A
13:-Universal Motor requires :
A:-AC only
B:-DC only
C:-AC and DC
D:-DC and shunt type
Ans: C
14:-All the sides of parallelogram are equal is called __________.
A:-Trapezium
B:-Rhombus
C:-Polygon
D:-Rectangle
Ans: B
15:-Gun Metal is an alloy of __________, __________ and __________.
A:-Copper, Aluminium, Zinc
B:-Copper, Tin, Zinc
C:-Iron, Copper, Tin
D:-Iron, Tin, Zinc
Ans: B
16:-1 kg weight = __________.
A:-9 Newtons
B:-10.8 Newtons
C:-9.8 Newtons
D:-8.5 Newtons
Ans: C
17:-Torque `=` ` `
A:-Force `xx` Acceleration
B:-Force `xx` Distance
C:-Force `xx` Radius
D:-Force `xx` Speed
Ans: C
18:-Aluminium ore is __________.
A:-Bauxite
B:-Antimony
C:-Graphite
D:-Galena
Ans: A
19:-Freezing point of mercury is __________.
A:-35°C
B:-36°C
C:-38°C
D:-39°C
Ans: D
20:-The ability of material to deform without breaking is called :
A:-Plasticity
B:-Elasticity
C:-Ductility
D:-Malleability
Ans: A
21:-Whenever heat is developed in a conductor it is governed by the :
A:-Lenz's Law
B:-Ampere's Law
C:-Joule's Law
D:-Newton's Law
Ans: C
22:-Squirrel cage induction motor is a :
A:-High starting torque motor
B:-Low starting torque motor
C:-Both (1) and (2)
D:-None of the above
Ans: B
23:-Which are fundamental units ?
A:-CGS, FPS and MKS
B:-MKS, MKSA and CGS
C:-CGS, FPS and SI
D:-FPS and MKS
Ans: A
24:-The flux density is the flux divided by :
A:-Conductivity
B:-Permeability
C:-Area of cross section
D:-Area of the current carrying conductor
Ans: C
25:-A pure resistive circuit in AC follows the :
A:-Ohm's Law
B:-Lenz's Law
C:-Faraday's Law of electrolysis
D:-Kirchhoff's Law
Ans: A
26:-Which of the following material has a negative temperature co-efficient of resistance ?
A:-Brass
B:-Copper
C:-Carbon
D:-Aluminium
Ans: C
27:-100 W and 40 W lamps are of the same voltage rating the resistance of 40 W lamp is __________.
A:-Higher
B:-Lower
C:-The same
D:-Lower with AC higher with DC
Ans: A
28:-Metric HP `=`
A:-746 watts
B:-746.5 watts
C:-735.5 watts
D:-735 watts
Ans: C
29:-Which lamp will take more current ?
A:-40 watts 200 V
B:-100 watts 24 V
C:-1000 watts 230 V
D:-100 watts 230 V
Ans: C
30:-Star/Delta starter used in a :
A:-DC series
B:-DC Shunt
C:-AC single phase
D:-Three phase Induction Motor
Ans: D
31:-It is difficult to magnetise steel because of its :
A:-Low permeability
B:-High permeability
C:-High density
D:-High retentivity
Ans: A
32:-One Farad is :
A:-One Coulomb per volt
B:-One volt per Coulomb
C:-Joule per volt
D:-Coulomb-Joules
Ans: A
33:-Which of the following acts as depolarizer in a Lechlanche cell ?
A:-Zinc Chloride
B:-Carbon Powder
C:-Manganese dioxide
D:-Ammonium Chloride
Ans: C
34:-What is the method of heat transfer accomplished in a hot water boiler ?
A:-Convection
B:-Conduction
C:-Radiation
D:-None of the above
Ans: A
35:-Which motor is suitable for rolling mills ?
A:-DC shunt motor
B:-DC series motor
C:-DC cumulative motor
D:-DC differential motor
Ans: C
36:-Composition of fuse wire :
A:-Lead 40 tin 60
B:-Lead 80 tin 20
C:-Lead 50 tin 50
D:-Lead 60 tin 40
Ans: D
37:-Rated capacities of IC TP 300A switch :
A:-500 V
B:-1000 V
C:-230 V
D:-250 V
Ans: A
38:-XC `=` ``
A:-R-XL
B:-`2pi `Fl
C:-2`pi`FC
D:-`(1)/(2piFC)`
Ans: D
39:-The power factor of a purely resistive circuit is :
A:-Zero
B:-Unity
C:-Leading
D:-Lagging
Ans: B
40:-In star connection line current `=` ``
A:-Phase current
B:-√3 Phase current
C:-√2 Phase current
D:-None of the above
Ans: A
A:-9 Newtons
B:-10.8 Newtons
C:-9.8 Newtons
D:-8.5 Newtons
Ans: C
17:-Torque `=` ` `
A:-Force `xx` Acceleration
B:-Force `xx` Distance
C:-Force `xx` Radius
D:-Force `xx` Speed
Ans: C
18:-Aluminium ore is __________.
A:-Bauxite
B:-Antimony
C:-Graphite
D:-Galena
Ans: A
19:-Freezing point of mercury is __________.
A:-35°C
B:-36°C
C:-38°C
D:-39°C
Ans: D
20:-The ability of material to deform without breaking is called :
A:-Plasticity
B:-Elasticity
C:-Ductility
D:-Malleability
Ans: A
21:-Whenever heat is developed in a conductor it is governed by the :
A:-Lenz's Law
B:-Ampere's Law
C:-Joule's Law
D:-Newton's Law
Ans: C
22:-Squirrel cage induction motor is a :
A:-High starting torque motor
B:-Low starting torque motor
C:-Both (1) and (2)
D:-None of the above
Ans: B
23:-Which are fundamental units ?
A:-CGS, FPS and MKS
B:-MKS, MKSA and CGS
C:-CGS, FPS and SI
D:-FPS and MKS
Ans: A
24:-The flux density is the flux divided by :
A:-Conductivity
B:-Permeability
C:-Area of cross section
D:-Area of the current carrying conductor
Ans: C
25:-A pure resistive circuit in AC follows the :
A:-Ohm's Law
B:-Lenz's Law
C:-Faraday's Law of electrolysis
D:-Kirchhoff's Law
Ans: A
26:-Which of the following material has a negative temperature co-efficient of resistance ?
A:-Brass
B:-Copper
C:-Carbon
D:-Aluminium
Ans: C
27:-100 W and 40 W lamps are of the same voltage rating the resistance of 40 W lamp is __________.
A:-Higher
B:-Lower
C:-The same
D:-Lower with AC higher with DC
Ans: A
28:-Metric HP `=`
A:-746 watts
B:-746.5 watts
C:-735.5 watts
D:-735 watts
Ans: C
29:-Which lamp will take more current ?
A:-40 watts 200 V
B:-100 watts 24 V
C:-1000 watts 230 V
D:-100 watts 230 V
Ans: C
30:-Star/Delta starter used in a :
A:-DC series
B:-DC Shunt
C:-AC single phase
D:-Three phase Induction Motor
Ans: D
31:-It is difficult to magnetise steel because of its :
A:-Low permeability
B:-High permeability
C:-High density
D:-High retentivity
Ans: A
32:-One Farad is :
A:-One Coulomb per volt
B:-One volt per Coulomb
C:-Joule per volt
D:-Coulomb-Joules
Ans: A
33:-Which of the following acts as depolarizer in a Lechlanche cell ?
A:-Zinc Chloride
B:-Carbon Powder
C:-Manganese dioxide
D:-Ammonium Chloride
Ans: C
34:-What is the method of heat transfer accomplished in a hot water boiler ?
A:-Convection
B:-Conduction
C:-Radiation
D:-None of the above
Ans: A
35:-Which motor is suitable for rolling mills ?
A:-DC shunt motor
B:-DC series motor
C:-DC cumulative motor
D:-DC differential motor
Ans: C
36:-Composition of fuse wire :
A:-Lead 40 tin 60
B:-Lead 80 tin 20
C:-Lead 50 tin 50
D:-Lead 60 tin 40
Ans: D
37:-Rated capacities of IC TP 300A switch :
A:-500 V
B:-1000 V
C:-230 V
D:-250 V
Ans: A
38:-XC `=` ``
A:-R-XL
B:-`2pi `Fl
C:-2`pi`FC
D:-`(1)/(2piFC)`
Ans: D
39:-The power factor of a purely resistive circuit is :
A:-Zero
B:-Unity
C:-Leading
D:-Lagging
Ans: B
40:-In star connection line current `=` ``
A:-Phase current
B:-√3 Phase current
C:-√2 Phase current
D:-None of the above
Ans: A
41:-Resistance above _________ Ω is called high resistance.
A:-100000 Ω
B:-10000 Ω
C:-10000000 Ω
D:-1000000 Ω
Ans: A
42:-Regenerative braking is possible when the speed of the motor is
A:-Bellow synchronous speed
B:-Above synchronous speed
C:-Same as synchronous speed
D:-All of the above
Ans: B
43:-V-curve of a synchronous motor is the relation between
A:-supply voltage and current
B:-armature current and field current
C:-armature voltage and armature current
D:-field voltage and field current
Ans: B
44:-Series type ohm meter is best suited for measuring
A:-medium resistance
B:-high resistance
C:-low resistance
D:-all of the above
Ans: A
45:-Fourth colour band of a resistance is brown in four colour band system, the tolerance of the resistance is
A:-2%
B:-5%
C:-1%
D:-3%
Ans: C
46:-A semiconducting material numbered as BC 149, the device is
A:-Germanium transistor
B:-Silicon diode
C:-Silicon transistor
D:-Silicon photo diode
Ans: C
47:-The capacity of cells are usually expressed in
A:-Watt-hour
B:-Kilo volt ampere
C:- Kilo watt hour
D:-Ampere hour
Ans: D
48:-Melting point of copper is
A:-1083° C
B:-660° C
C:-2200° C
D:-490° C
Ans: A
49:-Efficiency of full wave rectifier is about
A:-40.80 %
B:-82.10 %
C:-81.20 %
D:-83.10 %
Ans: C
50:-The maximum safe temperature can with stand class H insulating material is
A:-200° C
B:-180° C
C:-155° C
D:-120° C
Ans: B
51:-Pitch factor of a winding is the ratio of
A:-No of slote/pole pitch
B:-Winding pitch/pole pitch
C:-Pole pitch/winding pitch
D:-None of the above
Ans: B
52:-The type of motor used in vacuum cleaner is
A:-Capacitor start induction run motor
B:-Capacitor start capacitor run motor
C:-Induction run motor
D:-Universal motor
Ans: D
53:-Fluorescent lamp is a
A:-High pressure sodium vapour lamp
B:-Low pressure mercury vapour lamp
C:-Arc lamp
D:-High pressure mercury vapour lamp
Ans: B
54:-G series MCB's are used for protecting
A:-Inductive load
B:-Resistive load
C:-Capacitive load
D:-All of the above
Ans: A
55:-Nickel iron cell is also known as
A:-Primary cell
B:-Junger cell
C:-Voltaic cell
D:-Edison cell
Ans: D
56:-Nickel Iron cell are widly used in Aircraft engineering because of its
A:-Heavy rate discharging capacity
B:-High voltage
C:-High efficiency
D:-Good mechanical strength
Ans: D
57:-Widly used semiconducting material is
A:-Carbon
B:-Germanium
C:-Bismuth
D:-Silicon
Ans: D
58:-The out put of harmonic oscillators is
A:-Square wave
B:-Triangular wave
C:-Sine wave
D:-All of the above
Ans: C
59:-In a winding the number of coils/pole/phase is one, the winding is called
A:-Distributed winding
B:-Concentrated winding
C:-Whole coil winding
D:-Balanced winding
Ans: B
60:-The type of file used in ordinary filing purpose is
A:-Bastard
B:-Rough
C:-Smooth
D:-Second cut
Ans: A
61:-The joint used in over head line where for increasing the length of conductor where considerable tensile stress acted is
A:-T-Joint
B:-Brittania Joint
C:-Married Joint
D:-Western Union Joint
Ans: D
62:-Double squirrel cage Induction rotors are used in Induction motors for getting
A:-High starting torque
B:-Smooth operation
C:-High power
D:-Avoid magnetic locking
Ans: A
63:-The main purpose Twin Tube connections in a industries to
A:-Avoid glair
B:-Avoid stroboscopic effect
C:-Get more light
D:-All of the above
Ans: B
64:-The frequency equation of Hartley oscillator is
A:-1/2`pi` √`LC_(T)`
B:-1/2`pi` √`CL_(T)`
C:-1/2`pi` √`6RC`
D:-1/2`pi` √`L_(T)C_(T)`
Ans: B
65:-Buchholz relay is a
A:-Thermal relay
B:-Electronic relay
C:-Gas operated relay
D:-Phenumatic relay
Ans: C
66:-In semi direct lighting system _________ % of light reaches to the working plane.
A:-90 – 100 %
B:-50 – 90 %
C:-10 – 40 %
D:-60 – 90 %
Ans: D
67:-In EHT line the maximum permissible voltage drop is
A:-5 %
B:-3 %
C:-12.50 %
D:-10 %
Ans: C
68:-Solar cell is a
A:-Photo resistor
B:-Photo diode
C:-Varactor diode
D:-Thermister
Ans: B
69:-To get different colour in same LED different fixed voltage want to be applied across it. To get red colour in LED the fixed voltage want to applied across it is
A:-2.1 V
B:-2 V
C:-2.2 V
D:-1.8 V
Ans: D
70:-XLPE cable is a type of cable. XLPE stands for
A:-Cross-Linked Poly Ester Cable
B:-Cross-Linked Poly Ethylene Cable
C:-Cable-Linked Poly Ester Cable
D:-Cable-Linked Poly Ethylene Cable
Ans: B
71:-When Induction motor are started with star-delta starter the voltage applied across the winding when put in star position is
A:-57.70 %
B:-50 %
C:-67.70 %
D:-75 %
Ans: A
72:-The minimum horizontal clearance between when the line passing through adjesent building is
A:-1.112 M
B:-1.713 M
C:-1.219 M
D:-3.962 M
Ans: C
73:-Unit of inductive reactance is
A:-Coloumb
B:-Fared
C:-Henry
D:-Ohm
Ans: D
74:-The type of capacitor used in capacitor start induction run motor is
A:-Paper Capacitor
B:-Mica Capacitor
C:-Ceramic Capacitor
D:-Air Capacitor
Ans: A
75:-The commercial method of making Permanent Magnet is
A:-Induction method
B:-Single touch method
C:-Double touch method
D:-Divider touch method
Ans: A
76:-Most efficient and effective damping method is
A:-Air friction damping
B:-Eddy current damping
C:-Fluid friction damping
D:-All of the above
Ans: B
77:-The purpose of bedding provided in cable is
A:-Protect the cable from mechanical injury
B:-Protect the cable from atmosphere
C:-Protect metallic sheet from mechanical injury
D:-Prevent entering moisture to the cable
Ans: C
78:-Silver plated mica capacitors are best suited for ______ application.
A:-High frequency application
B:-High voltage application
C:-Radio frequency application
D:-Power factor correction
Ans: A
79:-When Dynamo meter type meters are used as watt meters, the fixed and movable coils are
A:-Fixed coil is pressure coil and moving coil is current coil
B:-Fixed coil is current coil and moving coil is pressure coil
C:-Both coils are movable
D:-Can be arranged as either current coil is fixed and pressure coil movable and vice-versa
Ans: B
80:-A 50 volt meter want to be extend to measure 250 volt meter. The resistance of the meter is 5000 Ω, what will be the value of multiplier required
A:-40000 Ω
B:-20000 Ω
C:-50000 Ω
D:-25000 Ω
Ans: B
81:-The instrument used for measuring insulation resistance of equipments is
A:-Contact resistance meter
B:-Earth tester
C:-Ohm meter
D:-Megger
Ans: D
82:-Among the following which cable is used for Railway signaling purpose
A:-PVC cable
B:-Lead sheet cable
C:-Torpodure cable
D:-Armed cable
Ans: C
83:-In Geyser the type of insulation provided in between the inner and outer chamber is
A:-Mica
B:-Rubber
C:-Glass wool
D:-Asbestose
Ans: C
84:-Among them which material is shows strong Dia magnetism
A:-Copper
B:-Silver
C:-Bismuth
D:-Aluminum
Ans: C
85:-Ear to Ear resistance of wet human body is about
A:-100 ohm
B:-150 ohm
C:-400 ohm
D:-300 ohm
Ans: A
86:-The major cause of creeping error in induct in type energy meter is
A:-Over voltage
B:-Over compensation friction
C:-Stray magnetic field
D:-Vibration
Ans: B
87:-The frequency of electricity supply in India is
A:-60 Hz
B:-45 Hz
C:-55 Hz
D:-50 Hz
Ans: D
88:-The size of copper plate used in plate earthing system is
A:-60 cm × 60 cm × 3.15 mm
B:-60 cm × 60 cm × 6.3 mm
C:-30 cm × 30 cm × 3.15 mm
D:-60 cm × 60 cm × 3.3 mm
Ans: A
89:-One Webber is equal to _____ Maxwell.
A:-10000
B:-100000
C:-10000000
D:-1000000
Ans: C
90:-The standard secondary out put of a current transformer is
A:-10A
B:-5A
C:-7A
D:-3A
Ans: B
91:-In two watt meter method of power measurement one watt meter shows negative reading the power factor of the load is
A:-unity
B:-bellow 0.5 lagging
C:-0.8 lagging
D:-in between 0.5 and 0.8 lagging
Ans: B
92:-The working principle of earth tester is
A:-Fall of potential method
B:-Wheatstone bridge principle
C:-Voltage divider method
D:-Meter bridge principle
Ans: A
93:-The polarity of interpole is in the case of DC generator and motor is
A:-same as next main pole ahead in the case of motor and generator in the direction of rotation
B:-same as the next main pole behind in the case of motor and generator in the direction of rotation of motor and generator
C:-same as next main pole behind in the case of generator and next main pole ahead in the motor in the direction of rotation
D:-same as next main pole behind in the case of motor and same as next main pole ahead in the generator in the direction of rotation
Ans: D
94:-The distance between earth electrode and adjacent building should not less than
A:-2 m
B:-1 m
C:-5 m
D:-1.5 m
Ans: D
95:-Type of cooling used in Distribution transformer is
A:-AN
B:-AN, OFN
C:-OB, AB
D:-AN, ON
Ans: D
96:-In a transistor both collector base junction and emitter base junction is reverse bias the transistor is said to be
A:-Saturation state
B:-Active state
C:-Cut off state
D:-None of the above
Ans: C
97:-The most commonly used AC motor is
A:-Slip ring induction motor
B:-Universal motor
C:-Repulsion motor
D:-Squirrelcage induction motor
Ans: D
98:-Barrier voltage of silicon crystal is
A:-0.7 v
B:-0.3 v
C:-1.1 v
D:-0.9 v
Ans: A
99:-FET is a
A:-current controlled device
B:-bipolar device
C:-power control device
D:-voltage control device
Ans: D
100:-The speed of DC shunt motor is drops slightly from no load to full load is due to
A:-Increase in back emf
B:-Decrease in field flux
C:-IaRa drop in armature
D:-Increase in field flux
Ans: C
A:-100000 Ω
B:-10000 Ω
C:-10000000 Ω
D:-1000000 Ω
Ans: A
42:-Regenerative braking is possible when the speed of the motor is
A:-Bellow synchronous speed
B:-Above synchronous speed
C:-Same as synchronous speed
D:-All of the above
Ans: B
43:-V-curve of a synchronous motor is the relation between
A:-supply voltage and current
B:-armature current and field current
C:-armature voltage and armature current
D:-field voltage and field current
Ans: B
44:-Series type ohm meter is best suited for measuring
A:-medium resistance
B:-high resistance
C:-low resistance
D:-all of the above
Ans: A
45:-Fourth colour band of a resistance is brown in four colour band system, the tolerance of the resistance is
A:-2%
B:-5%
C:-1%
D:-3%
Ans: C
46:-A semiconducting material numbered as BC 149, the device is
A:-Germanium transistor
B:-Silicon diode
C:-Silicon transistor
D:-Silicon photo diode
Ans: C
47:-The capacity of cells are usually expressed in
A:-Watt-hour
B:-Kilo volt ampere
C:- Kilo watt hour
D:-Ampere hour
Ans: D
48:-Melting point of copper is
A:-1083° C
B:-660° C
C:-2200° C
D:-490° C
Ans: A
49:-Efficiency of full wave rectifier is about
A:-40.80 %
B:-82.10 %
C:-81.20 %
D:-83.10 %
Ans: C
50:-The maximum safe temperature can with stand class H insulating material is
A:-200° C
B:-180° C
C:-155° C
D:-120° C
Ans: B
51:-Pitch factor of a winding is the ratio of
A:-No of slote/pole pitch
B:-Winding pitch/pole pitch
C:-Pole pitch/winding pitch
D:-None of the above
Ans: B
52:-The type of motor used in vacuum cleaner is
A:-Capacitor start induction run motor
B:-Capacitor start capacitor run motor
C:-Induction run motor
D:-Universal motor
Ans: D
53:-Fluorescent lamp is a
A:-High pressure sodium vapour lamp
B:-Low pressure mercury vapour lamp
C:-Arc lamp
D:-High pressure mercury vapour lamp
Ans: B
54:-G series MCB's are used for protecting
A:-Inductive load
B:-Resistive load
C:-Capacitive load
D:-All of the above
Ans: A
55:-Nickel iron cell is also known as
A:-Primary cell
B:-Junger cell
C:-Voltaic cell
D:-Edison cell
Ans: D
56:-Nickel Iron cell are widly used in Aircraft engineering because of its
A:-Heavy rate discharging capacity
B:-High voltage
C:-High efficiency
D:-Good mechanical strength
Ans: D
57:-Widly used semiconducting material is
A:-Carbon
B:-Germanium
C:-Bismuth
D:-Silicon
Ans: D
58:-The out put of harmonic oscillators is
A:-Square wave
B:-Triangular wave
C:-Sine wave
D:-All of the above
Ans: C
59:-In a winding the number of coils/pole/phase is one, the winding is called
A:-Distributed winding
B:-Concentrated winding
C:-Whole coil winding
D:-Balanced winding
Ans: B
60:-The type of file used in ordinary filing purpose is
A:-Bastard
B:-Rough
C:-Smooth
D:-Second cut
Ans: A
61:-The joint used in over head line where for increasing the length of conductor where considerable tensile stress acted is
A:-T-Joint
B:-Brittania Joint
C:-Married Joint
D:-Western Union Joint
Ans: D
62:-Double squirrel cage Induction rotors are used in Induction motors for getting
A:-High starting torque
B:-Smooth operation
C:-High power
D:-Avoid magnetic locking
Ans: A
63:-The main purpose Twin Tube connections in a industries to
A:-Avoid glair
B:-Avoid stroboscopic effect
C:-Get more light
D:-All of the above
Ans: B
64:-The frequency equation of Hartley oscillator is
A:-1/2`pi` √`LC_(T)`
B:-1/2`pi` √`CL_(T)`
C:-1/2`pi` √`6RC`
D:-1/2`pi` √`L_(T)C_(T)`
Ans: B
65:-Buchholz relay is a
A:-Thermal relay
B:-Electronic relay
C:-Gas operated relay
D:-Phenumatic relay
Ans: C
66:-In semi direct lighting system _________ % of light reaches to the working plane.
A:-90 – 100 %
B:-50 – 90 %
C:-10 – 40 %
D:-60 – 90 %
Ans: D
67:-In EHT line the maximum permissible voltage drop is
A:-5 %
B:-3 %
C:-12.50 %
D:-10 %
Ans: C
68:-Solar cell is a
A:-Photo resistor
B:-Photo diode
C:-Varactor diode
D:-Thermister
Ans: B
69:-To get different colour in same LED different fixed voltage want to be applied across it. To get red colour in LED the fixed voltage want to applied across it is
A:-2.1 V
B:-2 V
C:-2.2 V
D:-1.8 V
Ans: D
70:-XLPE cable is a type of cable. XLPE stands for
A:-Cross-Linked Poly Ester Cable
B:-Cross-Linked Poly Ethylene Cable
C:-Cable-Linked Poly Ester Cable
D:-Cable-Linked Poly Ethylene Cable
Ans: B
71:-When Induction motor are started with star-delta starter the voltage applied across the winding when put in star position is
A:-57.70 %
B:-50 %
C:-67.70 %
D:-75 %
Ans: A
72:-The minimum horizontal clearance between when the line passing through adjesent building is
A:-1.112 M
B:-1.713 M
C:-1.219 M
D:-3.962 M
Ans: C
73:-Unit of inductive reactance is
A:-Coloumb
B:-Fared
C:-Henry
D:-Ohm
Ans: D
74:-The type of capacitor used in capacitor start induction run motor is
A:-Paper Capacitor
B:-Mica Capacitor
C:-Ceramic Capacitor
D:-Air Capacitor
Ans: A
75:-The commercial method of making Permanent Magnet is
A:-Induction method
B:-Single touch method
C:-Double touch method
D:-Divider touch method
Ans: A
76:-Most efficient and effective damping method is
A:-Air friction damping
B:-Eddy current damping
C:-Fluid friction damping
D:-All of the above
Ans: B
77:-The purpose of bedding provided in cable is
A:-Protect the cable from mechanical injury
B:-Protect the cable from atmosphere
C:-Protect metallic sheet from mechanical injury
D:-Prevent entering moisture to the cable
Ans: C
78:-Silver plated mica capacitors are best suited for ______ application.
A:-High frequency application
B:-High voltage application
C:-Radio frequency application
D:-Power factor correction
Ans: A
79:-When Dynamo meter type meters are used as watt meters, the fixed and movable coils are
A:-Fixed coil is pressure coil and moving coil is current coil
B:-Fixed coil is current coil and moving coil is pressure coil
C:-Both coils are movable
D:-Can be arranged as either current coil is fixed and pressure coil movable and vice-versa
Ans: B
80:-A 50 volt meter want to be extend to measure 250 volt meter. The resistance of the meter is 5000 Ω, what will be the value of multiplier required
A:-40000 Ω
B:-20000 Ω
C:-50000 Ω
D:-25000 Ω
Ans: B
81:-The instrument used for measuring insulation resistance of equipments is
A:-Contact resistance meter
B:-Earth tester
C:-Ohm meter
D:-Megger
Ans: D
82:-Among the following which cable is used for Railway signaling purpose
A:-PVC cable
B:-Lead sheet cable
C:-Torpodure cable
D:-Armed cable
Ans: C
83:-In Geyser the type of insulation provided in between the inner and outer chamber is
A:-Mica
B:-Rubber
C:-Glass wool
D:-Asbestose
Ans: C
84:-Among them which material is shows strong Dia magnetism
A:-Copper
B:-Silver
C:-Bismuth
D:-Aluminum
Ans: C
85:-Ear to Ear resistance of wet human body is about
A:-100 ohm
B:-150 ohm
C:-400 ohm
D:-300 ohm
Ans: A
86:-The major cause of creeping error in induct in type energy meter is
A:-Over voltage
B:-Over compensation friction
C:-Stray magnetic field
D:-Vibration
Ans: B
87:-The frequency of electricity supply in India is
A:-60 Hz
B:-45 Hz
C:-55 Hz
D:-50 Hz
Ans: D
88:-The size of copper plate used in plate earthing system is
A:-60 cm × 60 cm × 3.15 mm
B:-60 cm × 60 cm × 6.3 mm
C:-30 cm × 30 cm × 3.15 mm
D:-60 cm × 60 cm × 3.3 mm
Ans: A
89:-One Webber is equal to _____ Maxwell.
A:-10000
B:-100000
C:-10000000
D:-1000000
Ans: C
90:-The standard secondary out put of a current transformer is
A:-10A
B:-5A
C:-7A
D:-3A
Ans: B
91:-In two watt meter method of power measurement one watt meter shows negative reading the power factor of the load is
A:-unity
B:-bellow 0.5 lagging
C:-0.8 lagging
D:-in between 0.5 and 0.8 lagging
Ans: B
92:-The working principle of earth tester is
A:-Fall of potential method
B:-Wheatstone bridge principle
C:-Voltage divider method
D:-Meter bridge principle
Ans: A
93:-The polarity of interpole is in the case of DC generator and motor is
A:-same as next main pole ahead in the case of motor and generator in the direction of rotation
B:-same as the next main pole behind in the case of motor and generator in the direction of rotation of motor and generator
C:-same as next main pole behind in the case of generator and next main pole ahead in the motor in the direction of rotation
D:-same as next main pole behind in the case of motor and same as next main pole ahead in the generator in the direction of rotation
Ans: D
94:-The distance between earth electrode and adjacent building should not less than
A:-2 m
B:-1 m
C:-5 m
D:-1.5 m
Ans: D
95:-Type of cooling used in Distribution transformer is
A:-AN
B:-AN, OFN
C:-OB, AB
D:-AN, ON
Ans: D
96:-In a transistor both collector base junction and emitter base junction is reverse bias the transistor is said to be
A:-Saturation state
B:-Active state
C:-Cut off state
D:-None of the above
Ans: C
97:-The most commonly used AC motor is
A:-Slip ring induction motor
B:-Universal motor
C:-Repulsion motor
D:-Squirrelcage induction motor
Ans: D
98:-Barrier voltage of silicon crystal is
A:-0.7 v
B:-0.3 v
C:-1.1 v
D:-0.9 v
Ans: A
99:-FET is a
A:-current controlled device
B:-bipolar device
C:-power control device
D:-voltage control device
Ans: D
100:-The speed of DC shunt motor is drops slightly from no load to full load is due to
A:-Increase in back emf
B:-Decrease in field flux
C:-IaRa drop in armature
D:-Increase in field flux
Ans: C
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