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
The meter of a vibrating reed frequency meter depends for its indications on the?
A. Electrical resonance of thin flat steel reeds
B. Mechanical resonance of thin flat steel reeds
C. Mechanical resonance of thick flat steel reeds
D. Electrical resonance of thick flat steel reeds
Right Answer: B. Mechanical resonance of thin flat steel reeds
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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 current sensitive instruments are?
A. PMMC
B. Hot wire instruments
C. Electrostatic instruments
D. Both a and b
Right Answer: D. Both a and b
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The 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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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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Electrostatic instruments are generally used as?
A. Voltmeters
B. Ammeters
C. Wattmeters
D. Watt-hour meters
Right Answer: A. Voltmeters
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The rating of the circuit breaker is usually determined on the basis of ____________ fault.
A. Symmetrical
B. Line to line
C. Single line to ground
D. Double line to ground
Right Answer: A. Symmetrical
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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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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 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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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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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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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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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
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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 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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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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In a fuel cell, electrical energy is produced by?
A. Reaction of hydrogen with oxygen
B. Thermionic action
C. Combustion of fuel in the absence of oxygen
D. All of the above
Right Answer: A. Reaction of hydrogen with oxygen
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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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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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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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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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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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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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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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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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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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When an ac power is applied to a reactive load, then the voltage is?
A. In phase with the current
B. 90 degree out of phase with the current
C. 180 degree out of phase with the current
D. 270 degree out of phase with the current
Right Answer: B. 90 degree out of phase with the current
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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
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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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Slip ring induction motor has?
A. Low starting torque
B. Medium starting torque
C. High starting torque
D. None of these
Right Answer: C. High starting torque
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What percentage of buses in the power system are generator buses?
A. 5 %
B. 25 %
C. 70 %
D. 10 %
Right Answer: D. 10 %
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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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The flow meter which is replacing the differential pressure meters in its applications is?
A. Vortex-shedding flow meter
B. Electromagnetic flow meters
C. Ultrasonic flow meters
D. All of these
Right Answer: A. Vortex-shedding flow meter
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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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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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Impurities are generally added in the pure semiconductor to?
A. increase the number of electrons
B. increase the number of holes
C. increase their conductivity
D. All of these
Right Answer: C. increase their conductivity
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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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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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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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The emf of the dry cell is about?
A. 0 V
B. 0.5 V
C. 1 V
D. 1.5 V
Right Answer: D. 1.5 V
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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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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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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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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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Transmission of power by ac cables is impossible beyond?
A. 35 – 45 km
B. 500 km
C. 300 km
D. 10 – 15 km
Right Answer: A. 35 – 45 km
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If an extra resistance is connected in the rotor circuit of slip ring induction motor, then?
A. Starting current and torque decreases
B. Starting current increases and torque decreases
C. Starting current decreases and torque increases
D. Starting current and torque increases
Right Answer: C. Starting current decreases and torque increases
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The 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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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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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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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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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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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
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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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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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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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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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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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Induction type instruments are generally used as?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. All of these
Right Answer: D. All of these
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What 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 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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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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The braking torque of induction type single – phase energy meter is?
A. Directly proportional to the flux
B. Inversely proportional to the flux
C. Directly proportional to the square of the flux
D. Inversely proportional to the square of the flux
Right Answer: C. Directly proportional to the square of the flux
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Which method of voltage control is applied for long line AC transmissions?
A. Switching by shunt capacitors
B. Tap changing transformers
C. Switching by shunt reactors
D. Static Var sources
Right Answer: C. Switching by shunt reactors
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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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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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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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The dielectric strength of air gap is?
A. 2.11kV/cm
B. 21.1kV/m
C. 21.1kV/cm
D. 2.11kV/m
Right Answer: C. 21.1kV/cm
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The 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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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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What is the normal range of angle for the parameter A?
A. 90 °
B. 70 ° – 40 °
C. 40 ° – 10 °
D. 0 – 10 °
Right Answer: D. 0 – 10 °
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Which among these is the cause of sparking at brushes in DC motor?
A. Defective brushes
B. Defect in Commutator
C. Excessive load
D. All of these
Right Answer: D. All of these
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What 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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By using which component can the transient stability limit of a power system be improved?
A. Series resistance
B. Series capacitor
C. Series inductor
D. Shunt resistance
Right Answer: B. Series capacitor
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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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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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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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For improving the power factor of coreless type induction furnace,?
A. Capacitor is used
B. Inductor is used
C. Resistor is used
D. Transistor is used
Right Answer: A. Capacitor is used
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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
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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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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
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The cut – in voltage for silicon and germanium are?
A. 0.3 V, 0.3 V
B. 0.3 V, 0.7 V
C. 0.7 V, 0.7 V
D. 0.7 V, 0.3 V
Right Answer: D. 0.7 V, 0.3 V
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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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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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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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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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If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are?
A. 300 W, 36000 J
B. 360 W, 30000 J
C. 380 W, 35000 J
D. 380 W, 36000 J
Right Answer: A. 300 W, 36000 J
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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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The motor which is most suitable for the traction work is / are?
A. DC series motor
B. DC shunt motor
C. Single phase ac series motor
D. Three phase induction motor
Right Answer: A. DC series motor
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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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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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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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Lux is the unit of?
A. Luminous flux
B. Luminous intensity
C. Illumination
D. Luminance
Right Answer: C. Illumination
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Which type of cable is used for underground service connections?
A. Low tension 3 ¼ core cable
B. Low tension 3 ½ core cable
C. Low tension 2 ¼ core cable
D. Low tension 2 ½ core cable
Right Answer: B. Low tension 3 ½ core cable
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Which 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 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
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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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he AC Bridge which is used for the measurement of frequency is?
A. Schering bridge
B. Wien bridge
C. Hay’s bridge
D. Anderson bridge
Right Answer: B. Wien bridge
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