Electrical engineering is a professional engineering discipline that generally deals with the study and application of electricity, electronics, and electromagnetism.This field first became an identifiable occupation in the later half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use.Electrical engineering has now subdivided into a wide range of subfields including electronics, digital computers, computer engineering, power engineering, telecommunications, control systems, radio-frequency engineering, signal processing, instrumentation, and microelectronics.Electrical engineers typically hold a degree in electrical engineering or electronic engineering. Practicing engineers may have professional certification and be members of a professional body.Electrical engineers work in a very wide range of industries and the skills required are likewise variable. These range from basic circuit theory to the management skills required of a project manager. Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
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Electrical Engineering Mcqs Online With Answers for NTS PPSC PTS Entry Test Classes
Electrical Engineering
Electrical Engineering Mcqs with Answers Solved
Capacitance sensor can measure very small displacement. It can be formed by varying?
A. Separation
B. Area
C. Permittivity
D. Either a or b or c
Right Answer: D. Either a or b or c
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Gauss’s law is applicable for?
A. Only point charge
B. Infinite line charge
C. Infinite sheet of charge
D. All of these
Right Answer: D. All of these
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The basic function of electronic ballast is?
A. To ignite the lamp
B. To stabilize the gas discharge
C. To supply the power to the lamp
D. All of these
Right Answer: D. All of these
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The man made noise sources is / are?
A. Motors
B. Switches, radio interferences
C. Computers, digital electronics
D. All of these
Right Answer: D. All of these
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Among the following damping method, the most effective and efficient damping is?
A. Air friction damping
B. Fluid friction damping
C. Eddy current damping
D. None of these
Right Answer: C. Eddy current damping
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A fuse wire of circular cross section has a radius of 0.8mm. The wire blows off at a current of 9A. What will be the radius of the wire that will blow off at a current of 1A?
A. 0.2 mm
B. 0.18 mm
C. 0.28 mm
D. 0.3 mm
Right Answer: B. 0.18 mm
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Which equipment is used for EHV lines to improve power transferability?
A. Shunt capacitor
B. Shunt reactor
C. Series capacitor
D. All of these
Right Answer: C. Series capacitor
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When an ac power is applied to a reactive load, then the voltage is?
A. In phase with the current
B. 90 degree out of phase with the current
C. 180 degree out of phase with the current
D. 270 degree out of phase with the current
Right Answer: B. 90 degree out of phase with the current
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Protective relays can be designed to respond to?
A. Light intensity, impedance
B. Temperature, resistance, reactance
C. Voltage and current
D. All of these
Right Answer: D. All of these
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In cascade control method, the set cannot be operated if?
A. PA > PB
B. PA < PB
C. PA = PB
D. None of these
Right Answer: C. PA = PB
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The Graetz bridge makes excellent use of?
A. Current transformer
B. Potential transformer
C. Power transformer
D. SCR
Right Answer: C. Power transformer
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In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes?
A. Positive
B. Negative
C. Zero
D. None of these
Right Answer: A. Positive
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When a 100 V moving iron voltmeter is of accuracy class 1 – 0 is used in a circuit, it reads 50 V. Then the maximum possible percentage error in the reading is?
A. 1 %
B. 2 %
C. 2.5 %
D. 3 %
Right Answer: B. 2 %
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In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of ?
A. 1:2
B. 2:1
C. 3:1
D. 1:3
Right Answer: C. 3:1
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In a fuel cell, electrical energy is produced by?
A. Reaction of hydrogen with oxygen
B. Thermionic action
C. Combustion of fuel in the absence of oxygen
D. All of the above
Right Answer: A. Reaction of hydrogen with oxygen
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Where is the synchronous motor drive with cycloconverters used?
A. Compressors
B. Ball mills in cement plants
C. Fans
D. All of these
Right Answer: B. Ball mills in cement plants
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The constant voltage transformers are most commonly used in?
A. Personal computers
B. Arc welding
C. Power distribution
D. Electric cars
Right Answer: A. Personal computers
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For very small cavities, discharge inception voltage?
A. Decreases as the cavity depth increases
B. Increases as the cavity depth increases
C. Remains unaffected as the cavity depth increases
D. None of these
Right Answer: A. Decreases as the cavity depth increases
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On what basis is the selection of fuse done?
A. Steady load
B. Fluctuating load
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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The electrodes used for projection welding are?
A. Flat and smaller in diameter
B. Flat and larger in diameter
C. Round and smaller in diameter
D. Round and larger in diameter
Right Answer: B. Flat and larger in diameter
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For Y – Δ and Δ – Y transformers, the phase shift between the transformer windings is equal to “ n * 30° “. What does ‘n’ represent in the equation?
A. Number of windings
B. Number of turns
C. Turn ratio
D. Hour number
Right Answer: D. Hour number
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What should be the insulation resistance in case of PVC wires?
A. 12.5 MΩ / number of outlet
B. 82.5 MΩ / number of outlet
C. 2.5 MΩ / number of outlet
D. 10.5 MΩ / number of outlet
Right Answer: A. 12.5 MΩ / number of outlet
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The emf of the dry cell is about?
A. 0 V
B. 0.5 V
C. 1 V
D. 1.5 V
Right Answer: D. 1.5 V
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The effects of EMI can be reduced by?
A. Suppressing emissions
B. Reducing the efficiency of the coupling path
C. Reducing the susceptibility of the receptor
D. All of these
Right Answer: D. All of these
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A trolley bus runs on tyres driven by?
A. A DC compound motor
B. A DC series motor
C. An AC series motor
D. An AC shunt motor
Right Answer: A. A DC compound motor
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What is restriking voltage?
A. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction.
B. The transient voltage that appears across the circuit breaker contacts at the end of arc extinction.
C. Both a and b
D. None of these
Right Answer: A. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction.
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In an electrodynamic instrument, the number of control springs present is / are?
A. Zero
B. One
C. Two
D. Four
Right Answer: D. Four
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The overload release protects the motor against?
A. Over voltage
B. Over current
C. Over load
D. All of these
Right Answer: C. Over load
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The Laser Beam Machining process can be carried out, when the media for energy transfer between tool and workpiece is?
A. Air
B. Liquid
C. Vacuum
D. Any of the above medium
Right Answer: D. Any of the above medium
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What is the unit of transmission loss coefficient?
A. MW
B. Unit less
C. (MW)-1
D. (MW)2
Right Answer: C. (MW)-1
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An SCR can be used?
A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. All of these
Right Answer: D. All of these
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Double edge modulation eliminates certain harmonics when the reference is a?
A. Sine wave
B. Square wave
C. Triangular wave
D. Trapezoidal wave
Right Answer: A. Sine wave
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In HRC fuses, the space within the body surrounding the element is usually filled with?
A. Silver
B. Zinc
C. Quartz
D. Copper
Right Answer: C. Quartz
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Electric heaters is made up of?
A. Chromed iron
B. Brass
C. Steel
D. Both a and b
Right Answer: D. Both a and b
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If a shunt motor is started with its field winding open then?
A. It will rotate at the same speed as that with its field winding closed
B. It will rotate at less speed as that with its field winding closed
C. It will rotate at dangerously high speed
D. None of these
Right Answer: C. It will rotate at dangerously high speed
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In a circuit breaker the contact space is ionised by what?
A. Field emission from the contact surface
B. Thermal emission from the contact surface
C. Thermal ionisation of gas
D. None of these
Right Answer: C. Thermal ionisation of gas
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An ideal diode is?
A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only a and c
Right Answer: D. Only a and c
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The flow meter which is replacing the differential pressure meters in its applications is?
A. Vortex-shedding flow meter
B. Electromagnetic flow meters
C. Ultrasonic flow meters
D. All of these
Right Answer: A. Vortex-shedding flow meter
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What should be the minimum depth of trench from the ground level for cables carrying a voltage between 3.3 kV and 11 kV?
A. 0.75 m plus radius of complete cable
B. 0.45 m plus radius of complete cable
C. 1.0 m plus radius of complete cable
D. All of these
Right Answer: A. 0.75 m plus radius of complete cable
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In a square – wave operation of 3 phase CSIs, the power values are on for?
A. 60 degree
B. 90 degree
C. 120 degree
D. 150 degree
Right Answer: C. 120 degree
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A step – down choppers can be used in?
A. Electric traction
B. Electric vehicles
C. Machine tools
D. All of these
Right Answer: D. All of these
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A variable charge is based on what?
A. Energy consumption
B. Maximum demand
C. Peak load demand
D. All of the above
Right Answer: A. Energy consumption
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In AC bridges, the Wagner earth devices are used to?
A. Remove all the earth capacitances from the bridge circuit
B. Remove harmonics
C. Reduce error caused by stray electric field
D. All of these
Right Answer: D. All of these
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What is the modern trend in electric power generation?
A. To have a large number of small size thermal plants located at different places.
B. To have large size thermal plants near load centre.
C. To have large size thermal plants located near coal fields.
D. None of the above.
Right Answer: C. To have large size thermal plants located near coal fields.
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Phase advancers are used to improve the power factor of?
A. Induction motors
B. Induction generators
C. Synchronous motors
D. Synchronous generators
Right Answer: A. Induction motors
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For a typical AC power supply, the secondary transmission carries the voltage of?
A. 11kV
B. 33kV
C. 66kV
D. 132kV
Right Answer: B. 33kV
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The product of rms values of current and voltage is called as?
A. Real power
B. Apparent power
C. Reactive power
D. Polar curves
Right Answer: B. Apparent power
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Transmission of power by ac cables is impossible beyond?
A. 35 – 45 km
B. 500 km
C. 300 km
D. 10 – 15 km
Right Answer: A. 35 – 45 km
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What is the relation between the fusing current and the diameter of the wire?
A. I = k d3
B. I = k d3/2
C. I = k d2
D. I = k d2/3
Right Answer: B. I = k d3/2
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Which among these is the least expensive protection for over current in low voltage system?
A. Rewirable fuse
B. Isolator
C. Circuit Breaker
D. Air breaker switch
Right Answer: A. Rewirable fuse
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The example of plastic welding is?
A. Resistance welding
B. Gas welding
C. Arc welding
D. Thermit welding without pressure
Right Answer: A. Resistance welding
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Transmission efficiency of a transmission line increases with the?
A. decrease in power factor and voltage
B. increase in power factor and voltage
C. increase in power factor but decrease in voltage
D. increase in voltage and decrease in power factor
Right Answer: B. increase in power factor and voltage
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If the frequency of electrodynamic power factor meter is doubled then its reading will become?
A. Twice of the original reading
B. Half of the original reading
C. Four times of the original reading
D. Remains unaffected
Right Answer: D. Remains unaffected
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At low temperature, the semi conductor behaves as a?
A. Perfect insulator
B. Perfect conductor
C. Perfect consulator
D. None of these
Right Answer: C. Perfect consulator
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he AC Bridge which is used for the measurement of frequency is?
A. Schering bridge
B. Wien bridge
C. Hay’s bridge
D. Anderson bridge
Right Answer: B. Wien bridge
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The electric power from primary distribution line is delivered to distribution substations by using?
A. 1 phase wire
B. 3 phase, 3 wire
C. 3 phase, 4 wire
D. All of these
Right Answer: C. 3 phase, 4 wire
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The coefficient of coupling is given by?
A. M / √(L2L1)
B. M / (L2 L1)
C. √(L2 L1) / M
D. (L2 L1) / M
Right Answer: A. M / √(L2L1)
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The high leakage impedance transformers are suitable for the applications of?
A. Arc welding
B. Personal computers
C. Street lights
D. Electric lamp
Right Answer: A. Arc welding
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Which type of cable does not require bedding?
A. Paper insulated lead covered cables
B. PVC cables
C. Both a and b
D. None of these
Right Answer: B. PVC cables
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The maximum firing angle in the half wave controlled regulator is?
A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree
Right Answer: D. 210 degree
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The ac voltage controller can be used for?
A. Lighting and heating control
B. On – line transformer tap changing
C. Soft starting
D. All of these
Right Answer: D. All of these
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In ac circuitμ the maximum current required is?
A. Equal to the effective current
B. 1.414 times the effective current
C. Twice the effective current
D. 1.732 times the effective current
Right Answer: B. 1.414 times the effective current
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Which among these is the application of universal motors?
A. Vacuum cleaners
B. Fans
C. Hair dryers
D. Washing machines
Right Answer: A. Vacuum cleaners
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What is the expression for the amplitude of the reflected wave?
A. Ir = [ (R + Z) / (R – Z) ] It
B. Ir = [ (R – Z) / Z ] It
C. Ir = [ (R – Z) / (R + Z) ] It
D. Ir = [ (R + Z) / Z ] It
Right Answer: C. Ir = [ (R – Z) / (R + Z) ] It
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In Daniel cell,?
A. Layer of hydrogen bubbles is formed
B. Polarization takes place
C. Negative pole is a copper vessel
D. None of these
Right Answer: D. None of these
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In leclanche cell, anode is packed in a porous pot containing ?
A. manganese dioxide
B. charcoal powder
C. sulphur dioxide
D. Only and b
Right Answer: D. Only a and b
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Leclanche cell Daniel cell is an example of?
A. Both dry cell
B. Both wet cell
C. dry cell, wet cell
D. wet cell, dry cell
Right Answer: B. Both wet cell
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The earth resistance can be measured by ?
A. Fall of potential method
B. Using an earth tester
C. Ducter ohmmeter method
D. Only a and b
Right Answer: D. Only a and b
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The fusing current of a fuse depends on its?
A. Material and its length
B. Length and its diameter
C. Material and diameter
D. Material, length and diameter
Right Answer: D. Material, length and diameter
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The transfer function of PWM is generally developed in?
A. Time domain
B. Frequency domain
C. Either a or b
D. None of these
Right Answer: C. Either a or b
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Swamping resistance is a resistance made up of ?
A. Alloy of manganin and copper
B. Alloy of aluminium and copper
C. Alloy of nickel and cobalt
D. Alloy of manganin and aluminium
Right Answer: A. Alloy of manganin and copper
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What is the maximum number of lighting points that can be connected in a circuit?
A. 5
B. 10
C. 8
D. 12
Right Answer: B. 10
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The zero drift is measured in units of?
A. Volts – °C
B. Volts / °C
C. °C / volts
D. (volts)2 / °C
Right Answer: B. Volts / °C
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Which type of cable is used for underground service connections?
A. Low tension 3 ¼ core cable
B. Low tension 3 ½ core cable
C. Low tension 2 ¼ core cable
D. Low tension 2 ½ core cable
Right Answer: B. Low tension 3 ½ core cable
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The cut – in voltage for silicon and germanium are?
A. 0.3 V, 0.3 V
B. 0.3 V, 0.7 V
C. 0.7 V, 0.7 V
D. 0.7 V, 0.3 V
Right Answer: D. 0.7 V, 0.3 V
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Primary current in a current transformer is determined by?
A. The load on the system
B. The load on its own secondary
C. The load on its own primary
D. All of these
Right Answer: A. The load on the system
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If an instrument transformer is used to extend the ranges of AC instrument, then its reading will depend on?
A. R
B. L
C. C
D. None of these
Right Answer: D. None of these
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A Capacitance Voltage Transformer can be connected to a?
A. High impedance device
B. Low impedance device
C. Relay coil
D. Only b and c
Right Answer: D. Only b and c
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The rotational speed of an AC induction motor depends on the?
A. Number of poles in stator
B. Frequency of the applied AC power
C. Both a and b
D. None of these
Right Answer: D. None of these
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Proximity effect is due to the current flowing in the?
A. Earth
B. Sheath
C. Nearby conductors
D. All of these
Right Answer: C. Nearby conductors
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In fibre – optic level sensors, the amount of light loss depends on?
A. The proportion of cable that is submerged in the liquid
B. Amount of light which is reflected back
C. The proportion of cable that is not in the liquid
D. Amount of light which is not reflected back
Right Answer: A. The proportion of cable that is submerged in the liquid
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Resins and varnishes are commonly used in?
A. Generators and motors
B. Cables
C. Transformers
D. Circuit breakers
Right Answer: A. Generators and motors
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If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic field set up by the conductors?
A. Attract each other
B. Repels each other
C. Perpendicular to each other
D. Parallel to each other
Right Answer: B. Repels each other
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In voltaic cell, anode and cathode of the cell is?
A. copper electrode, zinc
B. zinc, copper
C. aluminium, zinc
D. nickel, cobalt
Right Answer: A. copper electrode, zinc
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The linear variable differential transformer transducer is?
A. Inductive transducer
B. Non – inductive transducer
C. Capacitive transducer
D. Resistive transducer
Right Answer: A. Inductive transducer
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What is the cut off current in the fuse?
A. Maximum value actually reached
B. Rms value actually reached
C. Average value actually reached
D. None of the above
Right Answer: A. Maximum value actually reached
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What is the normal life of a fluorescent lamp?
A. 2000 hours
B. 3500 hours
C. 7500 hours
D. 10000 hours
Right Answer: C. 7500 hours
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In four – point starter, the no volt release is connected across the?
A. Supply line through a protective resistance
B. In series with field circuit through a protective resistance
C. Either (a) or (b)
D. None of these
Right Answer: A. Supply line through a protective resistance
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The resistance of an electric arc can be increased by?
A. Increasing the concentration of ionised particles
B. Reducing the arc length
C. Splitting the arc
D. Increasing the arc cross section
Right Answer: C. Splitting the arc
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The temperature errors in induction instruments can be compensated by?
A. Hunting in both ammeters and voltmeters
B. Combination of shunt and swamping resistance in both ammeters and voltmeters
C. Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters
D. Combination of shunt and swamping resistance in case of ammeters and hunting in case of voltmeters
Right Answer: C. Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters
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In percussion welding, the heat is produced by a rapid discharge of stored electrical energy from?
A. Capacitor
B. Inductor
C. Resistor
D. Transformer
Right Answer: A. Capacitor
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Reduced voltage can be applied across the stator circuit by?
A. Using an autotransformer
B. Connecting resistor in series with stator winding
C. Connecting inductor in series with stator winding
D. All of these
Right Answer: D. All of these
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What is the breaking capacity of the air blast circuit breaker?
A. 5000 MVA
B. 6000 MVA
C. 7000 MVA
D. 10000 MVA
Right Answer: C. 7000 MVA
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Which lamp is used in the outdoor illumination of buildings and airport runway?
A. Halogen lamp
B. Gaseous discharge lamp
C. Sodium vapour lamp
D. All of these
Right Answer: A. Halogen lamp
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Proximity effect?
A. Is more in large conductors, high frequency
B. Increases the resistance of the conductor
C. Reduces the self reactance
D. All of these
Right Answer: D. All of these
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The switching function of semiconductor devices can be characterized with?
A. Duty ratio only
B. Frequency only
C. Duty ratio and frequency
D. Duty ratio, frequency and time delay
Right Answer: D. Duty ratio, frequency and time delay
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The induced emf sets up the direction of current in such a way that the magnetic field produced by it?
A. Supports the cause producing it
B. Opposes the cause producing it
C. Increases
D. Decreases
Right Answer: B. Opposes the cause producing it
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For the measurement of low resistances from few ohms down to one micro ohm, which of the following instrument is not suitable?
A. Potentiometer method
B. Ammeter – voltmeter method
C. Ohmmeter
D. Kelvin double bridge method
Right Answer: C. Ohmmeter
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In capacitor start capacitor run induction motor, the capacitor remains in circuit?
A. Only at start
B. Only during running condition
C. At start as well as during running condition
D. None of these
Right Answer: C. At start as well as during running condition
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The braking torque of induction type single – phase energy meter is?
A. Directly proportional to the flux
B. Inversely proportional to the flux
C. Directly proportional to the square of the flux
D. Inversely proportional to the square of the flux
Right Answer: C. Directly proportional to the square of the flux
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