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50 Solved MCQs on Electricity Q.The rheostat is used in the circuit to : A. increase the magnitude of current only  B. decrease the magnitude of current only C. increase or decrease the magnitude of current  D. none of these  Ans :  (c) increase or decrease the magnitude of current   1 Electric current originates from which part of an atom? A. nucleus B. entire atom acting as a unit C. positively charged protons D. negatively charged electrons Ans: D Electric current originates from negatively charged electrons 2 Which of the following is true of electrical forces? A. Like charges attract, unlike charges repel. B. Electrical forces are produced by electrical charges. C. Positive and negative charges can combine to produce a third type D. Electrical forces are weaker than gravitational forces. Ans: B Electrical forces are produced by electrical charges 3 How can electric charge be established? A. Electrons can be removed from a...

BSNL TTAPaper  III:  Electrical  Specialization: 90 Marks Q.1 The two windings of a transformer is (A) conductively linked. (B) inductively linked. (C) not linked at all. (D) electrically linked. Ans : B Q.2 A salient pole synchronous motor is running at no load. Its field current is switched off. The motor will (A) come to stop. (B) continue to run at synchronous speed. (C) continue to run at a speed slightly more than the synchronous speed. (D) continue to run at a speed slightly less than the synchronous speed. Ans: B Q.3 The d.c. series motor should always be started with load because (A) at no load, it will rotate at dangerously high speed. (B) it will fail to start. (C) it will not develop high starting torque. (D) all are true. Ans: A Q.4 The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is about (A) 50 Hz. (B) 20 Hz. (C) 2 Hz. (D) Zero. Ans: C Q.5 In a stepper motor the angular displacement (A) can be precisely contro...