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
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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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
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2
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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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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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1
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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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In a three phase converter, the number of notches per cycle is?
A. One
B. Three
C. Six
D. Nine
Right Answer: C. Six
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0
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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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0
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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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0
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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
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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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The series capacitor peak voltmeter is suitable for?
A. Positive half cycle
B. Negative half cycle
C. Sinusoidal waveform
D. All of these
Right Answer: D. All of these
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0
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To control which among the following is the regulating transformer used in a power system?
A. Power flows
B. Frequency
C. Voltage
D. Power factor
Right Answer: A. Power flows
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Which part of the circuit breaker is helpful in breaking the current?
A. Trip coil
B. Contacts
C. Medium
D. Handle
Right Answer: B. Contacts
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0
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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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0
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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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What is the maximum load that is permitted in a power circuit?
A. 5000 watts
B. 3000 watts
C. 2000 watts
D. 10000 watts
Right Answer: B. 3000 watts
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0
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What will be the value of IC, if Ia1 = 100 ∠ 30° and Ib2 = 20 ∠ 90°?
A. 111.35 ∠ 21.05 °
B. 111.35 ∠ 15.05°
C. 111.35 ∠ 145.06°
D. 111.35 ∠ 158.94°
Right Answer: D. 111.35 ∠ 158.94°
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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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The wattles component is?
A. I
B. I cos∅
C. I sin∅
D. None of these
Right Answer: C. I sin∅
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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
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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
Total 1 Votes:
0
1
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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 the magnetic field is stationary and the conductor is in motion then the emf induced is called?
A. Dynamically induced emf
B. Statically induced emf
C. Self induced emf
D. Mutually induced emf
Right Answer: A. Dynamically induced emf
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The suitable lamps for street lighting are?
A. Mercury vapour lamps
B. Sodium discharge lamps
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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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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0
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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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In an autotransformer if the power transferred inductively is equal to the power conducted through, then transformation ratio is given by?
A. 1
B. 0.5
C. 2
D. 0
Right Answer: B. 0.5
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0
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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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0
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Zero sequence currents cannot flow in which of the following connections?
A. Delta
B. Star
C. Star – star
D. All of these
Right Answer: A. Delta
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0
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Advantage of using electron beam welding is / are?
A. Welds are clean
B. Absence of porosity
C. Distortion less
D. All of these
Right Answer: D. All of these
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0
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Buzzer in principle is a bell?
A. with hammer
B. with gong
C. with both hammer and gong
D. without hammer and gong
Right Answer: D. without hammer and gong
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0
1
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What does the area under the load curve represent?
A. System voltage
B. Current
C. Energy consumed
D. Maximum demand
Right Answer: C. Energy consumed
Total 1 Votes:
1
0
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The disadvantages of resonant transformers is?
A. Pure sine wave output
B. No high power arcing
C. No repeated flashovers
D. Additional variable chokes
Right Answer: D. Additional variable chokes
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0
1
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In current commutated DC-DC choppers, the voltage spike appears across the load when?
A. Voltage across the commutating inductances collapses
B. The capacitance voltage adds to the supply voltage
C. Both a and b
D. None of these
Right Answer: D. Both a and b
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0
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Due to presence of third harmonic component in the star-star connection of three phase transformer, the frequency of the circuit component becomes?
A. Three times of the circuit frequency
B. One third of the circuit frequency
C. Remains same
D. None of these
Right Answer: A. Three times of the circuit frequency
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Filters are used to convert?
A. Pulsating dc signal into a pure dc signal
B. Pure dc signal into a pulsating dc signal
C. Pulsating dc signal into a pure ac signal
D. Pulsating ac signal into a pure dc signal
Right Answer: A. Pulsating dc signal into a pure dc signal
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0
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On what factor does the operating speed of the relay depend?
A. Rate of flux built up
B. Armature core air gap
C. Spring tension
D. All of these
Right Answer: D. All of these
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2
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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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0
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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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0
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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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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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0
2
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In dynamometer type wattmeter, at equilibrium?
A. Tc > Td
B. Tc < Td
C. Tc = Td
D. None of these
Right Answer: C. Tc = Td
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0
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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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0
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To get a minimum value of stress (gmax) what should be the ratio of core diameter to sheath diameter?
A. 1 / 2.718
B. 2.178
C. 1 / 3.78
D. 3.78
Right Answer: A. 1 / 2.718
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0
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The handle of iron box is made up of ?
A. Bakelite
B. Ebonite
C. Chromium
D. Only a and b
Right Answer: D. Only a and b
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0
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The main electrode of high pressure mercury vapour lamp is made up of?
A. Quartz
B. Hard glass
C. Tungsten
D. Bronze
Right Answer: C. Tungsten
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0
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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 1 Votes:
0
1
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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
Total 2 Votes:
0
2
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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 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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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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0
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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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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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0
1
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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
Total 1 Votes:
0
1
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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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1
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Which section in the IE Act deals with the ‘theft of energy’?
A. Section 39
B. Section 40
C. Section 43
D. Section 44
Right Answer: A. Section 39
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1
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In a steam power station, electric power is generated at what power?
A. 440 V
B. 1.1 V
C. 11 V
D. 33 V
Right Answer: C. 11 V
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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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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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0
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The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is?
A. Sine wave
B. Square wave
C. Saw – tooth wave
D. Trapezoidal wave
Right Answer: B. Square wave
Total 1 Votes:
0
1
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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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“ 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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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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0
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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
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0
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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:
0
1
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Flood lighting is used for?
A. For enhancing the beauty of building at nights
B. For illuminating sports stadium
C. For illuminating show cases
D. All of these
Right Answer: D. All of these
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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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A large diversity factor of the load in a power system?
A. Reduces the installation cost.
B. Increases the installation cost.
C. Does not affect the installation cost.
D. None of the above
Right Answer: A. Reduces the installation cost.
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In cell, the current flows in outer circuit from?
A. Positive terminal to negative terminal and electrons from negative terminal to positive terminal
B. Positive terminal to negative terminal and electrons from positive terminal to negative terminal
C. Negative terminal to positive terminal and electrons from negative terminal to positive terminal
D. Negative terminal to positive terminal and electrons from positive terminal to negative terminal
Right Answer: A. Positive terminal to negative terminal and electrons from negative terminal to positive terminal
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Vibration galvanometer are generally used?
A. For measuring electric charges
B. As null – point detectors in ac bridges
C. As null – point detectors in dc bridges
D. For measuring power
Right Answer: B. As null – point detectors in ac bridges
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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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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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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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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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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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1
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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 telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are?
A. Morse key, Morse key
B. Morse key, Morse sounder
C. Morse sounder, Morse key
D. Morse sounder, Morse sounder
Right Answer: B. Morse key, Morse sounder
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In pole amplitude modulation method for controlling number of poles, practically, the wave used for modulation is?
A. Square wave
B. Triangular wave
C. Saw tooth wave
D. Sinusoidal wave
Right Answer: A. Square wave
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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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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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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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The dielectric loss of pure capacitor is equal to?
A. 1
B. 0
C. Maximum
D. None of these
Right Answer: B. 0
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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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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
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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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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 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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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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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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Throwing power is the ability of the electrolyte to produce?
A. Uniform deposit on an article of regular shape
B. Uniform deposit on an article of irregular shape
C. Non – uniform deposit on an article of regular shape
D. Non – uniform deposit on an article of irregular shape
Right Answer: B. Uniform deposit on an article of irregular shape
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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
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Which type of tripping is generally preferred for the circuit breaker?
A. Manual
B. Automatically
C. Depending on the voltage level
D. None of the above
Right Answer: B. Automatically
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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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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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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.
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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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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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The reactive power component kVAR is equal to the?
A. kVA sin∅
B. kW tan∅
C. kW cos∅
D. Both a and b
Right Answer: D.Both a and b
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1
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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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Any electrical signal present in a circuit other than the desired signal is known as?
A. Noise
B. Distortion
C. Interference
D. All of these
Right Answer: A. Noise
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