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.
Here we have large collection of Electrical Engineering Mcqs for all Students and jobs test preparation purpose. These Electrical Engineering Mcqs will be updated on daily basis and added more multiple choice question about Electrical Engineering frequently.You can prepare your Electrical Engineering Subject for different classes like 9th class, 10th class ,11th class 12th class exams, Entry Test like MCAT NTS ,OTS ,PTS ,BTS, GTS, Jobs Test,Recruitment Test like PPSC CSS FPSC SPSC KPPSC and interviews here.
Electrical Engineering Mcqs Online With Answers for NTS PPSC PTS Entry Test Classes
If the transformer is loaded then the secondary terminal voltage falls for and rises for?
A. Lagging power factor, leading power factor
B. Lagging power factor, unity power factor
C. Unity power factor, lagging power factor
D. Leading power factor, lagging power factor
Right Answer: A. Lagging power factor, leading power factor
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If the transformation ratio of an autotransformer is given by V2 / V1 then the ratio of power transferred to that of input power is given by?
A. (V2-V1) / V1
B. (V2+V1) / V1
C. (V1-V2) / V1
D. V2 / V1
Right Answer: D. V2 / V1
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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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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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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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EPRI stands for?
A. European power research institute
B. Electrical power Russian institute
C. Electrical power research institute
D. Electrical power research industries
Right Answer: C. Electrical power research institute
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When a solenoid attracts an iron bar,?
A. They leave the south pole to go around to the north pole
B. They leave the north pole to go around to the south pole
C. They leave the north pole to go to infinity
D. They leave the south pole to go to the infinity
Right Answer: B. They leave the north pole to go around to the south pole
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If an extra resistance is connected in the rotor circuit of slip ring induction motor, then?
A. Starting current and torque decreases
B. Starting current increases and torque decreases
C. Starting current decreases and torque increases
D. Starting current and torque increases
Right Answer: C. Starting current decreases and torque increases
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The resin bonded paper bushings are designed to operate at a maximum radial stress of?
A. 5 kV/cm
B. 10 kV/cm
C. 15 kV/cm
D. 20 kV/cm
Right Answer: D. 20 kV/cm
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In double delta transformation, a double delta refers to the case where there are two delta transformations in?
A. Parallel
B. Series
C. Both series and parallel
D. Neither series nor parallel
Right Answer: B. Series
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To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5 Ω in the unknown arm of bridge is required. The sensitivity is?
A. 0.2 mm / Ω
B. 0.3 mm / Ω
C. 0.4 mm / Ω
D. 0.5 mm / Ω
Right Answer: B. 0.3 mm / Ω
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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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The wrong statement among the following is?
A. A fuse can be fitted in an outlet socket
B. A fuse should not get overheated
C. The current rating of fuse should not exceed the rating of the smallest cable protected
D. Fuse having rating less than 3 A can be used in radio
Right Answer: A. A fuse can be fitted in an outlet socket
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What is tariff?
A. The rate at which electrical energy is produced in the plant.
B. The rate at which electrical energy is supplied to the consumers.
C. Both a and b
D. None of these
Right Answer: B. The rate at which electrical energy is supplied to the consumers.
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For carrying out parallel operation, transformers should have same X / R ratio in order to avoid?
A. Leakage reactance
B. Insulation failure
C. Circulating current
D. Inrush current
Right Answer: C. Circulating current
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The motor which is most suitable for the traction work is / are?
A. DC series motor
B. DC shunt motor
C. Single phase ac series motor
D. Three phase induction motor
Right Answer: A. DC series motor
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Reactive power is measured in terms of?
A. kW
B. kVA
C. kVAR
D. None of these
Right Answer: C. kVAR
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If the firing angle becomes negative, then the rectifier begins to work as?
A. A rectifier
B. An inverter
C. A chopper
D. A regulator
Right Answer: B. An inverter
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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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Current transformers and potential transformers are used to increase the ranges of?
A. AC ammeter and AC voltmeter respectively
B. AC ammeter and DC voltmeter respectively
C. DC ammeter and DC voltmeter respectively
D. DC ammeter and AC voltmeter respectively
Right Answer: A. AC ammeter and AC voltmeter respectively
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The current sensitive instruments are?
A. PMMC
B. Hot wire instruments
C. Electrostatic instruments
D. Both a and b
Right Answer: D. Both a and b
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The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is?
A. Zero
B. Infinity
C. One
D. Two
Right Answer: A. Zero
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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 power absorbed by a pure inductive circuit and pure capacitive circuit is?
A. Zero and non zero
B. Non zero and zero
C. Non zero and non zero
D. Zero and zero
Right Answer: D. Zero and zero
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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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What is the voltage characteristic of a differential compound DC motor?
A. Rising
B. Dropping
C. Flat
D. Exponential
Right Answer: Dropping
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Induction type instruments are generally used as?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. All of these
Right Answer: D. All of these
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What type of insulation is preferred for DC smoothing Reactors?
A. Oil
B. Air
C. Paper
D. Vanish
Right Answer: A. Oil
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3 – point starter is used to start the?
A. Series motor
B. Shunt motor
C. Compound motor
D. Only b and c
Right Answer: D. Only b and c
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1
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What is the reason for excess reading of the energy meter?
A. Defective wiring
B. Meter defects
C. Over voltage
D. Both a and b
Right Answer: D. Both a and b
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The load carried by V – V connection is?
A. 47.7% of the original load
B. 57.7% of the original load
C. 67.7% of the original load
D. 87.7% of the original load
Right Answer: B. 57.7% of the original load
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1
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What will be the capacitance of a 100 km long, 3 phase, 50Hz overhead transmission line consisting of 3 conductors, each of 2 cm and spaced 2.5 m at the corners of an equilateral triangle?
A. 1.007 μ F/phase
B. 2.0075 μ F/phase
C. 2.5 μ F/phase
D. 1.45 μ F/phase
Right Answer: A. 1.007 μ F/phase
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The capacitance effect can be neglected in which among the transmission lines?
A. Short transmission lines
B. Medium transmission lines
C. Long transmission lines
D. All of these
Right Answer: A. Short transmission lines
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Electrostatic voltmeter instruments are suitable for?
A. AC work only
B. DC work only
C. Both AC and DC work
D. None of these
Right Answer: C. Both AC and DC work
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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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Which among the following buses constitute the maximum number in a power system?
A. Slack bus
B. P Q bus
C. P V bus
D. All of these
Right Answer: B. P Q bus
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The primary reason for the low power factor is due to the installation of?
A. Induction motors
B. DC motors
C. Synchronous motors
D. Commutator motors
Right Answer: A. Induction motors
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Slip of an induction motor increases with?
A. increase in current and decrease in torque
B. increase in current and torque
C. decrease in current and torque
D. decrease in current and increase in torque
Right Answer: B. increase in current and torque
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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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0
1
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What is the use of current transformers?
A. Stepping up AC current
B. Measuring and protection
C. Stepping down AC current
D. Both b and c
Right Answer: D. Both b and c
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For extinguishing arc in an high voltage fuses, the element can be immersed in?
A. Oil
B. Carbon tetrachloride
C. Carbon tetrafloride
D. Only a and b
Right Answer: A. Only a and b
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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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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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A single phase transmission line of impedance j0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is?
A. Unity
B. 0.8 lagging
C. 0.8 leading
D. 0.6 lagging
Right Answer: D. 0.6 lagging
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AC power in a load can be controlled by using?
A. two SCR’s in parallel opposition
B. two SCR’s in series
C. three SCR’s in series
D. four SCR’s in series
Right Answer: A. two SCR’s in parallel opposition
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1
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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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Which among these is the cause of sparking at brushes in DC motor?
A. Defective brushes
B. Defect in Commutator
C. Excessive load
D. All of these
Right Answer: D. All of these
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What data is provided from the no load test on induction motors?
A. Core loss only
B. Magnetising current
C. No load power factor
D. All of these
Right Answer: D. All of these
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The power required for electro-deposition is?
A. DC and very low voltage
B. DC and high voltage
C. AC and very low voltage
D. AC and high voltage
Right Answer: A. DC and very low voltage
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Which method is used for locating cable fault?
A. Bridge method
B. Tracer method
C. Both bridge and tracer method
D. None of these
Right Answer: C. Both bridge and tracer method
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Which among these waves is called a standard lightning impulse wave?
A. 1.2 / 100 microsecond wave
B. 1.2 / 50 microsecond wave
C. 2.4 / 100 microsecond wave
D. 2.4 / 50 microsecond wave
Right Answer: B. 1.2 / 50 microsecond wave
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The non coincidence between loading and unloading curves is known as?
A. Zero drift characteristics
B. Sensitivity drift characteristics
C. Hysteresis
D. Zero drift plus sensitivity drift characteristics
Right Answer: C. Hysteresis
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The potential transformers are used to measure large voltage using?
A. High range voltmeter
B. Low range voltmeter
C. High range ammeter
D. Low range ammeter
Right Answer: B. Low range voltmeter
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Why are the ternary lead cables used near the railway tracks?
A. Because they have high tensile strength
B. Have a low coefficient of thermal expansion
C. Have low specific gravity
D. Can withstand shocks and vibrations
Right Answer: C. Have low specific gravity
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To detect an over – current fault condition, the most reliable method is to connect a?
A. Current sensor across IGBT
B. Voltage sensor across IGBT
C. Current sensor in series with IGBT
D. Voltage sensor in series with IGBT
Right Answer: Current sensor in series with IGBT
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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 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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Why is the transmission lines transposed?
A. Reduce corona loss
B. Reduce skin effect
C. Prevent interference with the neighbouring telephone lines
D. Prevent short circuit between any two lines
Right Answer: C. Prevent interference with the neighbouring telephone lines
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The leakage current must not be more than ____________ of maximum supply current.
A. 1 / 1000
B. 1 / 100
C. 1 / 5000
D. 1 / 500
Right Answer: C. 1 / 5000
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In electrodynamic instruments, the operating field is produced by?
A. Permanent magnet
B. Fixed coil
C. Moving coil
D. All of these
Right Answer: B. Fixed coil
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What should be the value of earthing resistance for large power stations?
A. 1 Ω
B. 0.5 Ω
C. 2 Ω
D. 5 Ω
Right Answer: B. 0.5 Ω
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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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At what rated voltage is the shielded cable provided in a low voltage system?
A. Rated voltage < 1kV
B. Rated voltage < 500V
C. Rated voltage > 1 kV
D. Any of these
Right Answer: A. Rated voltage < 1kV
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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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What is the limit of the conductor cross section when paper insulation is used?
A. 50 mm2
B. 250 mm2
C. 600 mm2
D. 1200 mm2
Right Answer: C. 600 mm2
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The positive plates of nickel iron cell is made up of?
A. Nickel hydroxide
B. Lead peroxide
C. Ferrous hydroxide
D. Potassium hydroxide
Right Answer: A. Nickel hydroxide
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For which among the following the current ratings are not required?
A. Circuit breakers
B. Relays
C. Isolators
D. Load break switch
Right Answer: C. Isolators
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What happens to the zero sequence currents, if the neutral in the Y connection is absent?
A. Minimum
B. Maximum
C. Zero
D. ∞
Right Answer: C. Zero
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The multiplying factor of electrostatic voltmeters is given by?
A. ( C + C v ) / C
B. ( C + C v ) / C v
C. C / ( C + C v )
D. C v / ( C + C v )
Right Answer: A. ( C + C v ) / C
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What happens in a load shedding?
A. System voltage is reduced.
B. System frequency is reduced.
C. System loads are switched off.
D. System power factor is changed.
Right Answer: C. System loads are switched off
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Impurities are generally added in the pure semiconductor to?
A. increase the number of electrons
B. increase the number of holes
C. increase their conductivity
D. All of these
Right Answer: C. increase their conductivity
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Secondary’s cells are?
A. lead acid cell
B. alkaline cell
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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The transformer ratio of the transformer depends upon the?
A. Exciting current
B. Secondary current
C. Power factor of secondary circuit
D. All of these
Right Answer: D. All of these
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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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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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Which factor is controlled by turbine and governor?
A. Voltage
B. Frequency
C. Power Factor
D. All of these
Right Answer: B. Frequency
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The making and breaking currents of a 3 phase ac circuit breakers in power systems are respectively in ________form.
A. rms value, rms value
B. instantaneous value, rms value
C. rms value, instantaneous value
D. instantaneous value, instantaneous value
Right Answer: D. instantaneous value, instantaneous value
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With the use of high speed circuit breakers, which among the following stability is increased?
A. Steady state stability
B. Transient stability
C. Frequency stability
D. All of these
Right Answer: B. Transient stability
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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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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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Which material has a lower dielectric strength at 50 Hz?
A. Bakelite
B. Glass
C. Air
D. None of these
Right Answer: C. Air
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Slip ring induction motor has?
A. Low starting torque
B. Medium starting torque
C. High starting torque
D. None of these
Right Answer: C. High starting torque
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The starting torque and power factor of shaded pole induction motor?
A. High, low
B. Low, high
C. Low, low
D. High, high
Right Answer: C. Low, low
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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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The dielectric strength of air gap is?
A. 2.11kV/cm
B. 21.1kV/m
C. 21.1kV/cm
D. 2.11kV/m
Right Answer: C. 21.1kV/cm
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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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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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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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If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become?
A. Thrice of the current drawn when connected in delta
B. Twice of the current drawn when connected in delta
C. One third of the current drawn when connected in delta
D. Half of the current drawn when connected in delta
Right Answer: C. One third of the current drawn when connected in delta
Total 0 Votes:
0
0
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Which among the following is not the type of digital voltmeters?
A. Ramp type
B. Integrating
C. Potentiometric type
D. None of these
Right Answer: D. None of these
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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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The electrodes used in carbon arc welding are made up of?
A. Carbon
B. Graphite
C. Either carbon or graphite
D. Zinc
Right Answer: C. Either carbon or graphite
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0
1
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The current flowing through the resistance is given by?
A. I cos∅
B. I sin∅
C. I tan∅
D. I cot∅
Right Answer: A. I cos∅
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1
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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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Which material is used for wiring continuous bus bar?
A. Aluminium
B. Copper
C. Both a and b
D. None of these
Right Answer: A. Aluminium
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0
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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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“ Total electric flux through any closed surface is equal to the charge enclosed by that surface ”. This is?
A. Lenz’s law
B. Gauss’s law
C. Maxwell’s law
D. Faraday’s law
Right Answer: B. Gauss’s law
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The positive sequence current is always equal to?
A. 1/3 of the negative sequence current
B. Always zero
C. Negative sequence current
D. 3 times the negative sequence current
Right Answer: C. Negative sequence current
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The potential difference between two points is given by?
A. V = E / Q
B. V = W / Q
C. V = Q / E
D. V = Q / W
Right Answer: B. V = W / Q
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0
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Lithium cells operates ranging from?
A. -25 ° C to 25 ° C
B. -50 ° C to 25 ° C
C. -50 ° C to 75 ° C
D. -75 ° C to 75 ° C
Right Answer: C. -50 ° C to 75 ° C
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