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
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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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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The high leakage impedance transformers are suitable for the applications of?
A. Arc welding
B. Personal computers
C. Street lights
D. Electric lamp
Right Answer: A. Arc welding
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What is the advantage of the static capacitors?
A. Low losses
B. Easy installation
C. Lower maintenance
D. All of the above
Right Answer: D. All of the above
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The example of plastic welding is?
A. Resistance welding
B. Gas welding
C. Arc welding
D. Thermit welding without pressure
Right Answer: A. Resistance welding
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2
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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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1
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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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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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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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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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The electrodes used in carbon arc welding are made up of?
A. Carbon
B. Graphite
C. Either carbon or graphite
D. Zinc
Right Answer: C. Either carbon or graphite
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In light emitting diode, the available light emitting region is ?
A. Less than 2.5 mm
B. From 2.5 to 25 mm
C. Greater than 25 mm
D. Greater than 50 mm
Right Answer: B. From 2.5 to 25 mm
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The equivalent inductance of fixed coil and moving coil of electrodynamic instrument is given by?
A. L1 + L2 + 2M
B. L1 + L2 – 2M
C. L1 + L2 + M
D. L1 + L2 – M
Right Answer: A. L1 + L2 + 2M
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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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Copper losses is proportional to ?
A. kVA
B. square of kVA
C. cube of kVA
D. None of these
Right Answer: B. square of kVA
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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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The positive plates of nickel iron cell is made up of?
A. Nickel hydroxide
B. Lead peroxide
C. Ferrous hydroxide
D. Potassium hydroxide
Right Answer: A. Nickel hydroxide
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1
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What is the main purpose of oil in oil circuit breakers?
A. Provide insulation
B. Quenching arc.
C. Provide cooling of contacts.
D. None of the above
Right Answer: B. Quenching arc.
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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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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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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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The man made noise sources is / are?
A. Motors
B. Switches, radio interferences
C. Computers, digital electronics
D. All of these
Right Answer: D. All of these
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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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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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In order to bring the pointer to rest within a short time,?
A. Gravity control is required
B. Damping control is required
C. Spring control is required
D. All of these
Right Answer: B. Damping control is required
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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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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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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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With increase in temperature of the body, the emission of light waves is?
A. Increases
B. Decreases
C. Remain same
D. None of these
Right Answer: A. Increases
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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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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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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 data is provided from the no load test on induction motors?
A. Core loss only
B. Magnetising current
C. No load power factor
D. All of these
Right Answer: D. All of these
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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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SF6 is which type of gas?
A. Electro positive
B. Electro negative
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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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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1
1
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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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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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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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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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Moving iron power factor meter are suitable for 3 phase balanced circuits. It consists of?
A. One control spring
B. Two control spring
C. Three control spring
D. No control spring
Right Answer: D. No control spring
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1
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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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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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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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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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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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For what voltage is the H type of poles used?
A. 22 kV
B. 130 kV
C. 11 kV
D. All of these
Right Answer: B. 130 kV
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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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2
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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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A single phase transmission line of impedance j0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is?
A. Unity
B. 0.8 lagging
C. 0.8 leading
D. 0.6 lagging
Right Answer: D. 0.6 lagging
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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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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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Swamping resistance is a resistance made up of ?
A. Alloy of manganin and copper
B. Alloy of aluminium and copper
C. Alloy of nickel and cobalt
D. Alloy of manganin and aluminium
Right Answer: A. Alloy of manganin and copper
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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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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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The metal which can be extracted from its ore by the method of electrolysis is /are?
A. Zinc
B. Aluminium
C. Copper
D. All of these
Right Answer: D. All of these
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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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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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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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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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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 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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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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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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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 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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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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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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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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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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For moment of inertia to be small in two phase servomotor, the ratio of rotor diameter to its length should be?
A. Equal to 1
B. Small
C. Large
D. All of these
Right Answer: B. Small
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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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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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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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What is the maximum voltage that XLPE cables can withstand?
A. 65 ° C
B. 80 ° C
C. 110 ° C
D. 130 ° C
Right Answer: D. 130 ° C
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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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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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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 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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In a series RLC circuit, the wave front and wave tail times are controlled by changing the value?
A. R only
B. R and L simultaneously
C. R and C simultaneously
D. L and C simultaneously
Right Answer: B. R and L simultaneously
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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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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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Which material is used for the manufacture of brushes in DC motors?
A. Graphite
B. Lead
C. Copper
D. All of these
Right Answer: A. Graphite
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2
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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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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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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 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 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
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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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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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The insulation resistance of a cable of length 10 km is 1M Ω . For a length of 100 km of the same cable, what will be the insulation resistance?
A. 1 M Ω
B. 10 M Ω
C. 0.1 M Ω
D. 0.01 M Ω
Right Answer: C. 0.1 M Ω
Total 1 Votes:
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1
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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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0
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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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Which factor is controlled by turbine and governor?
A. Voltage
B. Frequency
C. Power Factor
D. All of these
Right Answer: B. Frequency
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1
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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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0
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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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Transmission efficiency of a transmission line increases with the?
A. decrease in power factor and voltage
B. increase in power factor and voltage
C. increase in power factor but decrease in voltage
D. increase in voltage and decrease in power factor
Right Answer: B. increase in power factor and voltage
Total 1 Votes:
0
1
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For the measurement of radio interference voltages, the detector circuit is provided with a measuring device to measure?
A. Average value
B. Peak value
C. Quasi-peak value
D. All of these
Right Answer: D. All of these
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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
Total 1 Votes:
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1
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