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Question 1 of 20
1. Question
1 pointsElectrical Generator works on the principle of:
CorrectCongratulations, Working principle of Electrical Generator is Fleming’s Right Hand Rule
Tip to Remember: Generator – Fleming’s RiGht hand rule ( Remember the G term)
IncorrectSorry, Correct Answer is Fleming’s Right Hand Rule. Electical Motor operates as per Fleming’s Left Hand Rule.
Tip to Remember: Generator – Fleming’s RiGht hand rule ( Remember the G)
Hint
Electrical Generator and Electrical Motor works on two different exactly opposite principles
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Question 2 of 20
2. Question
1 pointsWhich of the following quantity is same in a series electrical circuit:
CorrectIn Series Circuit current flowing through the circuit will remain same
IncorrectIn an electrical series circuit magnitude of current will not change
Hint
If there is no parallel branches exist in electrical circuit which of the quantity remains same
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Question 3 of 20
3. Question
1 pointsTransformer oil used in Electrical Transformer acts as:
CorrectIncorrectIn an Electrical Transformer, Transformer oil acts as both Insulation Medium and Coolant
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Question 4 of 20
4. Question
1 pointsInduction motor during no load condition will have a power factor in the range:
CorrectBecause of High Magnetizing current power factor is low in Induction Motor during no-load condition
IncorrectInduction motor during no load condition will draw high magnetizing current. This magnetizing current will not do any useful work (rotating the load). Therefore power factor will be low during no load in Induction Motor
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Question 5 of 20
5. Question
1 pointsA non sinusoidal voltage and current waveforms are generated when a non linear load is connected to supply system:
CorrectIncorrectWhen a non-linear loads such as electronic devices (computers, Television sets) are connected to the supply system, Voltage and Current flowing in the system will be distorted and results in Harmonics Generation
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Question 6 of 20
6. Question
1 pointsImpact of Electro-static charge on a surface of a body cannot be reduced by connecting the surface to the ground
CorrectThe Charge will dissipate to the ground
IncorrectWhen a Electro-Static Charge is connected to the ground, the charge dissipates to the ground
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Question 7 of 20
7. Question
1 pointsThe equivalent resistance of three resistances each of 3Ω connected in parallel will be:
Correct1/Req = 1/R1+1/R2+1/R3
1/Req =1/3+1/3+1/3 =3/3 =1ΩIncorrectWhen resistors are Connected in Parallel
1/Req = 1/R1+1/R2+1/R3
1/Req =1/3+1/3+1/3 =3/3 =1Ω -
Question 8 of 20
8. Question
1 pointsWhich material is used in the fuse:
CorrectIncorrect -
Question 9 of 20
9. Question
1 pointsSingle phase induction motor is a self starting motor:
CorrectSingle Pole Induction Motor cannot Generate Rotating Magnetic Field
IncorrectSingle Phase Induction Motor is not self stating as it cannot produce rotating magnetic field like 3-phase induction motor.
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Question 10 of 20
10. Question
1 pointsA lamp operated at 120V has a resistance of 10 Ω. What is the wattage of the lamp:
CorrectP = V2/R = (120)2/10 = 1440 Watts
IncorrectP = V2/R = (120)2/10 = 1440 Watts
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Question 11 of 20
11. Question
1 pointsA 240V, 40 W tungsten lamp has a working resistance of:
CorrectR = V2/P = (240)2/40 = 1440 Ohms
IncorrectR = V2/P = (240)2/40 = 1440 Ohms
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Question 12 of 20
12. Question
1 pointsA Wattmeter can be used to measure power in:
CorrectIncorrect -
Question 13 of 20
13. Question
1 pointsWhich of the following machine has higher efficiency of the following
CorrectTransformer will have no rotating parts like other electrical machines and no air gap in flux path.
IncorrectElectrical Transformer will have higher efficiency as there is no rotating parts and airgap in the flux path involved in it. Generally efficiency of the Transformer is of the order of 95% to 99% during full load operation
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Question 14 of 20
14. Question
1 pointsIn a circuit supplying power to capacitive loads, voltage waveform will lag behind the current waveform:
CorrectIncorrectIn Capacitor Circuit Voltage waveform lags current waveform and has leading power factor. Inductive circuit will be exactly opposite
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Question 15 of 20
15. Question
1 points__ are wasteful circulation currents observed in iron cores which results in loss of energy
CorrectEddy Currents are useless currents induced because of change in magnetic fields in conductors or in core. Eddy currents does not do any useful work and results in loss
IncorrectEddy Currents are circulating currents generated in the core which does no useful work. Because of the eddy currents I2R losses will be originated. Eddy Current losses are induced due to the change in magnetic fields in a conductor or core
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Question 16 of 20
16. Question
1 pointsMegger is used to measure which of the following:
CorrectInsulation Resistance of the Device is measured using Megger
IncorrectMegger is used to measure insulation resistance
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Question 17 of 20
17. Question
1 pointsWhat is the efficiency if a 10-hp motor draws 40 amps at 240V?
CorrectP in = V x I = 240 x 40 = 9600 watts
Efficiency = (Pout x 746) / Pin = (10 x 746) / 9600 = 0.777IncorrectP in = V x I = 240 x 40 = 9600 watts
Efficiency = (Pout x 746) / Pin = (10 x 746) / 9600 = 0.777 -
Question 18 of 20
18. Question
1 pointsA resistance of 5ohms is connected in series with a parallel of four resistances each of 1 ohm. What will be the equivalent resistance of the circuit
Correct5 ohm series + 4 parallel circuits each 1 ohm = 5+0.25 = 5.25 ohms
Incorrect5 ohm series + 4 parallel circuits each 1 ohm = 5+0.25 = 5.25 ohms
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Question 19 of 20
19. Question
1 pointsIn a 60Hz a.c circuit, its voltage is 120V and current is 12A, the current lags the voltage by 60 deg. Find the power in watts:
CorrectP = V x I x Cos(phi) = 120 x 12 x 1/2 =720 watts
IncorrectP = V x I x Cos(phi) = 120 x 12 x 1/2 =720 watts
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Question 20 of 20
20. Question
1 pointsGenerally motor load can be represented by:
CorrectExplanation: Electrical motor consists of winding which can be expressed as resistor and inductor
IncorrectExplanation: Electrical machine consists of winding. Any current carrying conductor consists of both inductor and resistor. Hence it can be represented in the form of R-L load