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
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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Double edge modulation eliminates certain harmonics when the reference is a?
A. Sine wave
B. Square wave
C. Triangular wave
D. Trapezoidal wave
Right Answer: A. Sine wave
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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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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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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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If induction motor is direct switched-on then it will develop?
A. 1.5 times their full load torque
B. 1.5 to 2.5 times their full load torque
C. 2.5 times their full load torque
D. 1.5 to 5 times their full load torque
Right Answer: B. 1.5 to 2.5 times their full load torque
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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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1
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Heating element of electric iron box is an alloy of?
A. Copper and nickel
B. Nickel and cobalt
C. Iron and magnesium
D. Nickel and chromium
Right Answer: D. Nickel and chromium
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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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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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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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Ballistic galvanometer are principally used for the measurement of ?
A. Current
B. Voltage
C. Power
D. Electric charges
Right Answer: D. Electric charges
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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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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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In four – point starter, the no volt release is connected across the?
A. Supply line through a protective resistance
B. In series with field circuit through a protective resistance
C. Either (a) or (b)
D. None of these
Right Answer: A. Supply line through a protective resistance
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The 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
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1
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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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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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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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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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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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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 maximum firing angle in the half wave controlled regulator is?
A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree
Right Answer: D. 210 degree
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A step – down choppers can be used in?
A. Electric traction
B. Electric vehicles
C. Machine tools
D. All of these
Right Answer: D. All of these
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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 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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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
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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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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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In capacitor start capacitor run induction motor, the capacitor remains in circuit?
A. Only at start
B. Only during running condition
C. At start as well as during running condition
D. None of these
Right Answer: C. At start as well as during running condition
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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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A variable charge is based on what?
A. Energy consumption
B. Maximum demand
C. Peak load demand
D. All of the above
Right Answer: A. Energy consumption
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In 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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What is the speed range of poly phase Commutator motors?
A. 0.5 Ns to 1 Ns
B. 0.5 Ns to 1.5 Ns
C. 0.1 Ns to 2 Ns
D. 0.5 Ns to 2.5 Ns
Right Answer: B. 0.5 Ns to 1.5 Ns
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1
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What type of earthing is used by transmission lines?
A. Plate earthing
B. Rod earthing
C. Strip earthing
D. All of these
Right Answer: C. Strip earthing
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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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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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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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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
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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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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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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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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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2
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In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are?
A. One
B. Two
C. Three
D. Four
Right Answer: B. Two
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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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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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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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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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Bidirectional semiconductor device is?
A. Diode
B. BJT
C. SCR
D. TRIAC
Right Answer: D. TRIAC
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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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Which device is connected in series?
A. RC surge suppressors
B. Smoothing reactors
C. Metal oxide veristors
D. Static balancer
Right Answer: B. Smoothing reactors
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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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Why are load flow studies carried out?
A. To study of stability of the system
B. For fault calculations
C. For planning the power system
D. All of these
Right Answer: C. For planning the power system
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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 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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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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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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With gate open, the maximum anode current at which SCR is turned off from ON condition is called?
A. Breakdown voltage
B. Peak reverse voltage
C. Holding current
D. Latching current
Right Answer: C. Holding current
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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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oltage commutation circuit can be converted into a current commutation by interchanging the positions of?
A. Diode and capacitor
B. Capacitor and SCR
C. Inductor and capacitor
D. Capacitor and load
Right Answer: A. Diode and capacitor
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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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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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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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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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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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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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How many outlets are permitted in a power circuit?
A. 10 points
B. 2 points
C. 5 points
D. 1 points
Right Answer: B. 2 points
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Proximity effect?
A. Is more in large conductors, high frequency
B. Increases the resistance of the conductor
C. Reduces the self reactance
D. All of these
Right Answer: D. All of these
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The 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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Protective relays can be designed to respond to?
A. Light intensity, impedance
B. Temperature, resistance, reactance
C. Voltage and current
D. All of these
Right Answer: D. All of these
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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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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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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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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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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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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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Electrical work is?
A. Directly proportional to the potential difference
B. Directly proportional to the charge
C. Directly proportional to the current
D. All of these
Right Answer: D. All of these
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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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Determine the average demand of a plant if its load factor and maximum demand are 0.60 and 30 MW.
A. 20 MW
B. 18 MW
C. 50 MW
D. 13 MW
Right Answer: B. 18 MW
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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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2
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The charging current drawn by the cable?
A. Lags behind the voltage by 90°
B. Leads the voltage by 90°
C. Are in phase with each other
D. Leads the voltage by 60°
Right Answer: B. Leads the voltage by 90°
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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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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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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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For a typical AC power supply, the secondary transmission carries the voltage of?
A. 11kV
B. 33kV
C. 66kV
D. 132kV
Right Answer: B. 33kV
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The 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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2
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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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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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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
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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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The power curve for a purely resistive circuit is zero only when?
A. Current is zero
B. Voltage is zero
C. Both current and voltage is zero
D. None of these
Right Answer: C. Both current and voltage is zero
Total 1 Votes:
0
1
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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
Total 0 Votes:
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0
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Which among the following is / are used for the solution of load flow using FDLF method?
A. [(Δ P) / E] = [B‘ ] [Δ δ]
B. [(Δ Q) / E] = [B“ ] [ Δ E]
C. [(Δ P) / E] = [B“ ] [ Δ δ]
D. Both a and b
Right Answer: D. Both a and b
Total 0 Votes:
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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 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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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
Total 0 Votes:
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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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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
Total 1 Votes:
0
1
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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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What is the source of heat generation in cables?
A. Copper loss in conductor
B. Dielectric losses in cable insulation
C. Losses in metallic sheathings and armouring
D. All of these
Right Answer: D. All of these
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