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Electrical Engineering Mcqs Online With Answers
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
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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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 a push – pull converter, the filter capacitor can be obtained as?
A. Cmin = V / ( Vr L f2 )
B. Cmin= ( 1 – D ) V / ( Vr L f2 )
C. Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 )
D. Cmin= ( 1 – 2 D ) V / 42 ( Vr L f2 )
Right Answer: C. Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 )
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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
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1
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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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What is the typical value of the capacitor used in ‘capacitor start capacitor run’ induction motor?
A. 5 μ F
B. 40 μ F
C. 300 μ F
D. 1000 μ F
Right Answer: D. 300 μ F
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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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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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1
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Steel rail poles of height 13 meters are used for transmission purpose of _________ voltage.
A. 33 kV
B. 11 kV
C. 22 kV
D. Both a and b
Right Answer: A. 33 kV
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Phase advancers are used for which among the following machines?
A. Transformers
B. Synchronous machines
C. Induction motors
D. DC machines
Right Answer: C. Induction motors
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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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The artificial source of light is?
A. Arc lamp
B. Incandescent lamp
C. Discharge lamp
D. All of these
Right Answer: D. All of these
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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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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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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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Electrical power output in a d.c. generator is equal to?
A. Electrical power developed in armature – copper losses
B. Mechanical power input – iron and friction losses
C. Electrical power developed in armature – iron and copper losses
D. Mechanical power input – iron and friction losses – copper losses
Right Answer: D. Mechanical power input – iron and friction losses – copper losses
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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 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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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 the voltage characteristic of a differential compound DC motor?
A. Rising
B. Dropping
C. Flat
D. Exponential
Right Answer: Dropping
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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
Total 2 Votes:
1
1
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The power demand can be estimated approximately by?
A. Load survey method
B. Mathematical method
C. Statistical method
D. Economic parameters
Right Answer: C. Statistical method
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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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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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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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If the armature current of dc series motor has become twice then the torque will become?
A. Twice of the former
B. Four times of the former
C. One fourth of the former
D. Remains same
Right Answer: B. Four times of the former
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1
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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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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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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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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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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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In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a?
A. Linear function
B. Non linear function
C. Constant function
D. None of these
Right Answer: D. None of these
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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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1
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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 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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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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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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0
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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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0
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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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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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In N – type semiconductor, the impurities added to a semiconductor are?
A. Trivalent
B. Pentavalent
C. Monovalent
D. Tetravalent
Right Answer: B. Pentavalent
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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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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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0
1
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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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0
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For voltage boosting in distribution networks the capacitors used is?
A. Series capacitors
B. Shunt capacitors
C. Both a and b
D. None of these
Right Answer: A. Series capacitors
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0
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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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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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0
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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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The efficiency of the transformer will be maximum when?
A. Iron losses is equal to the twice of the copper losses
B. Copper losses is equal to the twice of the iron losses
C. Iron losses is equal to the copper losses
D. All of these
Right Answer: C. Iron losses is equal to the copper losses
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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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The resistances of potential transformer winding is minimized by using?
A. Thick conductors and small length of turns
B. Thin conductors and small length of turns
C. Thin conductors and large length of turns
D. Thick conductors and large length of turns
Right Answer: A. Thick conductors and small length of turns
Total 1 Votes:
0
1
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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
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0
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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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0
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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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0
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The net power in a series R-C circuit is?
A. Zero
B. Positive
C. Negative
D. None of these
Right Answer: B. Positive
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The reduction of utility load primarily during peak demand is known as?
A. Peak clipping
B. Load shifting
C. Valley filling
D. MTP analysis
Right Answer: A. Peak clipping
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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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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 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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0
1
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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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The advantage of rectifier type welding set is?
A. Reduced no – load losses
B. Easy arc starting
C. Less hazardous
D. Both a and b
Right Answer: D. Both a and b
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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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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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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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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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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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0
1
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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
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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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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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Bidirectional semiconductor device is?
A. Diode
B. BJT
C. SCR
D. TRIAC
Right Answer: D. TRIAC
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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 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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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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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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1
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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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Treeing phenomenon is observed in?
A. Capacitors
B. Cables
C. Insulators
D. Only a and b
Right Answer: D. Only a and b
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Which among these is a part of HVDC link?
A. Two earth electrodes
B. Converter valves
C. Bipolar DC line
D. All of these
Right Answer: D. All of these
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Double fourier series analysis of PWM is?
A. Two dimensional functions
B. Three dimensional functions
C. One dimensional functions
D. All of these
Right Answer: A. Two dimensional functions
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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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1
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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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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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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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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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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 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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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
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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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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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In a flyback converter, the inductor of the buck-boost converter has been replaced by a?
A. Flyback capacitor
B. Flyback resistor
C. Flyback transformer
D. Flyback transistor
Right Answer: C. Flyback transformer
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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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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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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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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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The current efficiency is defined as the ratio of?
A. Actual quantity of the substance deposited to the theoretical quantity of the substance deposited
B. Actual quantity of the substance deposited to the theoretical quantity of the substance liberated
C. Theoretical quantity of the substance deposited to the actual quantity of the substance deposited
D. Theoretical quantity of the substance deposited to the actual quantity of the substance liberated
Right Answer: B. Actual quantity of the substance deposited to the theoretical quantity of the substance liberated
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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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1
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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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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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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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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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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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