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MCQs 1: When an ac power is applied to a reactive load, then the voltage is

In phase with the current 90 degree out of phase with the current 180 degree out of phase with the current 270 degree out of phase with the current
Answer Explanation

MCQs 2: If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be

Remains same Twice of the former Four times of former emf Half of the former emf
Answer Explanation

MCQs 3: When the motor runs on no load, then

Back emf is almost equal to applied voltage Back emf will be greater than applied voltage Back emf will be less than applied voltage None of these
Answer Explanation

MCQs 4: The field winding of dc series motor consists of few turns of

Thin wire with low resistance Thick wire with low resistance Thin wire with high resistance Thick wire with high resistance
Answer Explanation

MCQs 5: If the armature current of dc series motor has become twice then the torque will become

Twice of the former Four times of the former One fourth of the former Remains same
Answer Explanation

MCQs 6: For application in electric locomotives or for traction purposes, the most suitable motor is

Dc series motor Differentially compounded motor Cumulatively compounded motor None of these
Answer Explanation

MCQs 7: In order to bring the pointer to rest within a short time,

Gravity control is required Damping control is required Spring control is required All of these
Answer Explanation

MCQs 8: Among the following damping method, the most effective and efficient damping is

Air friction damping Fluid friction damping Eddy current damping None of these
Answer Explanation

MCQs 9: The moving system of induction type single - phase energy meter consists of

One pointer and two control spring One pointer and one control spring Two pointer and two control spring No pointer and no control spring
Answer Explanation

MCQs 10: The braking torque of induction type single - phase energy meter is

Directly proportional to the flux Inversely proportional to the flux Directly proportional to the square of the flux Inversely proportional to the square of the flux
Answer Explanation

MCQs 11: The power curve for a purely resistive circuit is zero only when

Current is zero Voltage is zero Both current and voltage is zero None of these
Answer Explanation

MCQs 12: The power absorbed by a pure inductive circuit and pure capacitive circuit is

Zero and non zero Non zero and zero Non zero and non zero Zero and zero
Answer Explanation

MCQs 13: The product of rms values of current and voltage is called as

Real power Apparent power Reactive power Polar curves
Answer Explanation

MCQs 14: The net power in a series R-C circuit is

Zero Positive Negative None of these
Answer Explanation

MCQs 15: For solving parallel ac circuit, the method used is

Vector method Admittance method Symbolic or j - method All of these
Answer Explanation

MCQs 16: For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with

Mixture of copper and nickel Mixture of chloride and sodium Mixture of aluminium and sulphate Mixture of salt and coal
Answer Explanation

MCQs 17: The fusing current of a fuse depends on its

Material and its length Length and its diameter Material and diameter Material, length and diameter
Answer Explanation

MCQs 18: The wrong statement among the following is

A fuse can be fitted in an outlet socket A fuse should not get overheated The current rating of fuse should not exceed the rating of the smallest cable protected Fuse having rating less than 3 A can be used in radio
Answer Explanation

MCQs 19: In HRC fuses, the space within the body surrounding the element is usually filled with

Silver Zinc Quartz Copper
Answer Explanation

MCQs 20: For extinguishing arc in an high voltage fuses, the element can be immersed in

Oil Carbon tetrachloride Carbon tetrafloride Only (a) and (b)
Answer Explanation

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