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
Which among the following sequence is correct for a synchronous generator?
A. I”d > Id > I’d
B. Id > I’d > I”d
C. I”d > I’d > Id
D. Id > I”d > I’d
Right Answer: C. I”d > I’d > Id
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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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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
Total 1 Votes:
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1
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Flat rate tariff is charged on what basis?
A. Connected load
B. Units consumed
C. Maximum demand
D. All of these
Right Answer: B. Units consumed
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The range of visible radiation lies betweenThe range of visible radiation lies between?
A. 2000 angstrom to 2500 angstrom
B. 4000 angstrom to 4500 angstrom
C. 5000 angstrom to 6000 angstrom
D. 4000 angstrom to 7500 angstrom
Right Answer: D. 4000 angstrom to 7500 angstrom
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0
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If an electrostatic voltmeter is used on AC circuit and has non uniform waves, then it will read?
A. Average values
B. RMS values
C. Peak values
D. All of these
Right Answer: B. RMS values
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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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A vector quantity has?
A. Only magnitude
B. Only direction
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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0
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Harmonics in 3 phase inverters can be reduced by using?
A. Passive filter
B. Active filter
C. Both passive and active filters
D. None of these
Right Answer: C. Both passive and active filters
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0
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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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0
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AC series motors are most suitable for?
A. Urban services
B. Sub-urban services
C. Main line services
D. All of these
Right Answer: C. Main line services
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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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1
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According to the Paschen’s Law, the breakdown voltage of a uniform field gap is?
A. Directly proportional to the gas pressure and inversely proportional to the electrode gap
B. Inversely proportional to the gas pressure and directly proportional to the electrode gap
C. Directly proportional to the both electrode gap and gas pressure
D. Inversely proportional to the both electrode gap and gas pressure
Right Answer: C. Directly proportional to the both electrode gap and gas pressure
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0
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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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0
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What is dielectric absorption ratio?
A. (InR 30 s) / (InR 60 s)
B. (InR 60 s) / (InR 30 s)
C. (InR 10 s) / (InR 60 s)
D. (InR 60 s) / (InR 10 s)
Right Answer: B. (InR 60 s) / (InR 30 s)
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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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When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as?
A. Leakage flux
B. Fringing
C. Relative permeability
D. Magnetizing force
Right Answer: B. Fringing
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Under harmonic free load voltages, the 3 phase VSI?
A. Does not contains second harmonic
B. Does not contains third harmonic
C. Does not contains fifth harmonic
D. Does not contains seventh harmonic
Right Answer: A. Does not contains second harmonic
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0
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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
Total 1 Votes:
0
1
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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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Upto what motor ratings, the HRC fuse can be used as a protective device?
A. 500 V
B.1000 V
C. 1500 V
D. 5000 V
Right Answer: B. 1000 V
Total 2 Votes:
0
2
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At what condition does the corona start, if Es is the electrical stress and Ecr is the critical voltage?
A. Es > Ecr
B. Es = Ecr
C. Es < Ecr
D. Es << Ecr
Right Answer: A. Es > Ecr
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0
1
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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 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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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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0
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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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0
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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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0
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Plug setting of a electromagnetic relay can be altered by varying?
A. Number of ampere turns
B. Air gap of magnetic path
C. Adjustable back stop
D. None of these
Right Answer: A. Number of ampere turns
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0
0
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The thickness of insulation provided on the conductor in the cable depends on which among the following factor?
A. Operating voltage
B. Current to be carried
C. Power factor
D. Both a and b
Right Answer: A. Operating voltage
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2
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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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0
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In a single phase induction motor, the motor speed on no load is?
A. Almost equal to its synchronous speed
B. Less than its synchronous speed
C. Greater than synchronous speed
D. None of these
Right Answer: A. Almost equal to its synchronous speed
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0
1
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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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0
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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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0
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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 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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0
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Very large values of modulation index (greater than 3.24) lead to?
A. Square AC output voltage
B. Sine AC output voltage
C. Triangular AC output voltage
D. Trapezoidal AC output voltage
Right Answer: A. Square AC output voltage
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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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0
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The unit of electrical energy is / are?
A. Watt – sec
B. Joules
C. Kilowatt – hour
D. All of these
Right Answer: D. All of these
Total 1 Votes:
1
0
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What is the value of negative sequence impedance?
A. 1
B. Z
C. Same as positive sequence
D. ∞
Right Answer: C. Same as positive sequence
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0
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
Total 1 Votes:
1
0
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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
Total 1 Votes:
0
1
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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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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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1
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When a voltmeter – ammeter method is applied for the measurement of resistance, the voltmeter reads a value of 8.28 V and the ammeter reading is 4.14 mA. Then the value of the resistance will be?
A. 2 kΩ
B. 2.0 kΩ
C. 2.00 kΩ
D. 2.000 kΩ
Right Answer: C. 2.00 kΩ
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0
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In a three phase transformer, the angle between two consecutive cores is?
A. 30 degree
B. 60 degree
C. 120 degree
D. 160 degree
Right Answer: C. 120 degree
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0
1
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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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Which among these uses a low voltage DC source?
A. Remote indication
B. Emergency lighting system
C. Remote position control
D. All of these
Right Answer: D. All of these
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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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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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1
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Bidirectional semiconductor device is?
A. Diode
B. BJT
C. SCR
D. TRIAC
Right Answer: D. TRIAC
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1
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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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3
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What is the main cause of voltage instability?
A. Generators
B. Transformers
C. Loads
D. Line losses
Right Answer: C. Loads
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0
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To move electrons from valence band to conduction band, the energy applied to the insulator is?
A. Less than 15 eV
B. Equal to 15 eV
C. More than 15 eV
D. More than 25 eV
Right Answer: C. More than 15 eV
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The opposite of susceptibility is?v
A. Immunity
B. Emission
C. Interference
D. Electromagnetic compatibility
Right Answer: A. Immunity
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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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0
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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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0
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The most suited gate pulses given to the AC regulator with R – L load can be in the form of?
A. Continuous signal
B. Large isolating pulse transformer
C. A train of pulses
D. None of these
Right Answer: C. A train of pulses
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Lux is the unit of?
A. Luminous flux
B. Luminous intensity
C. Illumination
D. Luminance
Right Answer: C. Illumination
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The amount of flux density set up in the core is dependent upon?
A. Current
B. No. of turns, cross sectional area of core
C. Materials of the magnetic core, length of core
D. All of these
Right Answer: D. All of these
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0
0
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The most efficient torque producing actuating structure for the induction type relays is?
A. Shaded pole structure
B. Watt hour meter structure
C. Induction cup structure
D. Single induction loop structure
Right Answer: C. Induction cup structure
Total 0 Votes:
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0
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What is the factor of safety used for current ratings in a power installation?
A. 1
B. 1.75
C. 1.25
D. 2
Right Answer: D. 2
Total 1 Votes:
0
1
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What is the main purpose of oil in oil circuit breakers?
A. Provide insulation
B. Quenching arc.
C. Provide cooling of contacts.
D. None of the above
Right Answer: B. Quenching arc.
Total 0 Votes:
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0
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The isolators used in the transmission lines are capable of breaking?
A. Fault current
B. No current
C. Charging current
D. Load current
Right Answer: C. Charging current
Total 2 Votes:
0
2
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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
Total 2 Votes:
0
2
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Which of the following circuit breaker is highly reliable and has a least maintenance?
A. Oil circuit breakers
B. Air blast
C. Vacuum circuit breakers
D. SF6 circuit breakers
Right Answer: D. SF6 circuit breakers
Total 0 Votes:
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0
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For running at half of the maximum speed, the batteries of battery electric drive are connected in?
A. Parallel
B. Series
C. Series – parallel
D. Drive cannot run at this speed
Right Answer: C. Series – parallel
Total 2 Votes:
0
2
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Which insulating material is used for low voltage cables?
A. Impregnated paper
B. Rubber
C. Silk and cotton
D. Vulcanised Indian rubber
Right Answer: C. Silk and cotton
Total 0 Votes:
0
0
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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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0
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What is the advantage of HRC fuses over Rewirable fuses?
A. High speed operation
B. High rupturing capacity
C. No ageing effect
D. All of the above
Right Answer: D. All of the above
Total 1 Votes:
0
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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0
1
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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
Total 0 Votes:
0
0
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Wheatstone bridge is suitable for the measurement of?
A. Low resistance
B. Medium resistance
C. High resistance
D. Very high resistance
Right Answer: B. Medium resistance
Total 0 Votes:
0
0
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What is the multiplication factor used for the determination of maximum current carrying capacity of an 11 kV line?
A. 0.88
B. 0.95
C. 0.9
D. 0.8
Right Answer: C. 0.9
Total 0 Votes:
0
0
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The frequency of the induced emf in an induction motor is?
A. Greater than the supply frequency
B. Lesser than the supply frequency
C. Same as the supply frequency
D. None of these
Right Answer: C. Same as the supply frequency
Total 0 Votes:
0
0
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In DOL fuses are provided to protect against?
A. Short circuit protection
B. Over voltage
C. Over current
D. Over load
Right Answer: A. Short circuit protection
Total 0 Votes:
0
0
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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
Total 1 Votes:
0
1
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Which among the following quantities are to be determined in voltage controlled bus?
A. P and Q
B. Q and |V|
C. |V| and δ
D. Q and δ
Right Answer: D. Q and δ
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0
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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 phasor current through a 200 ohm resistor assuming a voltage of 200Arms at an angle of zero degree applied across it is?
A. 1Arms at an angle of zero degree
B. 1Arms at an angle of 45 degree
C. 1Arms at an angle of 90 degree
D. 1Arms at an angle of 180 degree
Right Answer: A. 1Arms at an angle of zero degree
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How are the zero sequence and negative sequence networks connected in case of LLG faults?
A. Parallel
B. Series
C. Can be connected in either way
D. Such type of connection does not exist
Right Answer: A. Parallel
Total 0 Votes:
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Upto what voltage can the liquid type HRC fuses be used?
A. 33 kV
B. 120 kV
C. 66 kV
D. 132 kV
Right Answer: D. 132 kV
Total 0 Votes:
0
0
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The metal which can be extracted from its ore by the method of electrolysis is /are?
A. Zinc
B. Aluminium
C. Copper
D. All of these
Right Answer: D. All of these
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For large low voltage transformers, the most commonly used connections are?
A. Star – star connection
B. Delta – delta connection
C. V connection
D. All of these
Right Answer: B. Delta – delta connection
Total 1 Votes:
0
1
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The range of electrostatic voltmeter can be extended by using?
A. Resistance potential divider method
B. Capacitance potential divider method
C. Both a and b
D. None of these
Right Answer: C. Both a and b
Total 0 Votes:
0
0
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Which alloy is used as electrical resistance alloy?
A. Nickel alloys
B. Nickel chromium alloys
C. Ferro nickel alloys
D. All of these
Right Answer: D. All of these
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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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0
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Electrodynamic instruments can be used as?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. All of these
Right Answer: D. All of these
Total 0 Votes:
0
0
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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
Total 1 Votes:
0
1
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For the measurement of radio interference voltages, the detector circuit is provided with a measuring device to measure?
A. Average value
B. Peak value
C. Quasi-peak value
D. All of these
Right Answer: D. All of these
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0
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According to the End Rule, the current directions when looked from one end of the coil if that end is South Pole and if the end is North Pole are?
A. Both clockwise
B. Anticlockwise, clockwise
C. Clockwise, anticlockwise
D. Both anticlockwise
Right Answer: C. Clockwise, anticlockwise
Total 1 Votes:
0
1
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SF6 is which type of gas?
A. Electro positive
B. Electro negative
C. Both a and b
D. None of these
Right Answer: C. Both a and b
Total 0 Votes:
0
0
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Which part of the tower is buried in the ground?
A. Anchor
B. Guy wire
C. Braces
D. Strut inclined support
Right Answer: A. Anchor
Total 0 Votes:
0
0
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Which of the following circuit breakers has the lowest operating voltage?
A. SF6 circuit breaker
B. Air break
C. Air blast
D. Minimum oil circuit breaker
Right Answer: B. Air break
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0
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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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0
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The power MOSFET device is a?
A. Current controlled unipolar device
B. Voltage controlled unipolar device
C. Current controlled bipolar device
D. Voltage controlled bipolar device
Right Answer: B. Voltage controlled unipolar device
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The insulation resistance of a cable of length 10 km is 1M Ω . For a length of 100 km of the same cable, what will be the insulation resistance?
A. 1 M Ω
B. 10 M Ω
C. 0.1 M Ω
D. 0.01 M Ω
Right Answer: C. 0.1 M Ω
Total 1 Votes:
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1
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Copper losses is proportional to ?
A. kVA
B. square of kVA
C. cube of kVA
D. None of these
Right Answer: B. square of kVA
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A single phase line has two parallel conductors 2 metre apart. The diameter of each conductor is 1.2 cm. What is the loop inductance per km of the line?
A. 2.423 mH
B. 1.234 mH
C. 3.267 mH
D. 8.632 mH
Right Answer: A. 2.423 mH
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Which material is used for the manufacture of brushes in DC motors?
A. Graphite
B. Lead
C. Copper
D. All of these
Right Answer: A. Graphite
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2
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Unipolar modulation is generally used in?
A. AC – AC converters
B. AC – DC converters
C. DC – AC converters
D. DC – DC converters
Right Answer: D. DC – DC converters
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