Synopsis of Electrical Engineering

Important multiple choice questions in Power systems 1.        In pump storage hydropower plant, the electrical machine is made to work alternately as generator and motor. The efficiency of the generator working at the same electrical power level is A)      Greater than that as motor B)       Equal to that as motor C)       Less than that as motor D)      Greater or less than that as motor depending on the type of machine 2.        In a thermal nuclear reactor                                 I.             The purpose of moderator is to slowdown fast neutrons produced due to fusion.                               II.             The moderator material must have low molecular weight.                             III.             Ordinary water can be used as moderator with natural uranium as fuel.                             IV.             The multiplication factor is kept slightly greater than unity during its normal functioning. Which of these statements are

Multiple Choice Questions in Measurements 1.        When reading is taken at half scale in the instrument, the error  is a)       Exactly equal to half of full-scale error b)       Equal to full-scale error c)        Less than full-scale error d)       More than full-scale error 2.        Torque/weight ratio of an instrument indicates a)       Selectivity b)       Accuracy c)        Fidelity d)       Sensitivity 3.        The errors introduced by the instrument fall in which category? a)       Systematic errors b)       Random errors c)        Gross errors d)       Environmental errors 4.        A Wheatstone bridge requires a change of 6 Ω in the unknown arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The sensitivity of the instrument is a)       0.5% b)       2% c)        0.5 mm/ Ω d)       2.0 Ω/mm 5.        Identify which one is not a fundamental unit in SI system a)       Ampere b)       Kelvi