(A) conductively linked.
(C) not linked at all.
(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.
(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.
(A) 50 Hz.
(C) the angular displacement cannot be precisely controlled.
(D) it cannot be used for positioning of work tables and tools in NC machines.
(A) low at light load only.
(B) low at heavy load only.
(C) low at light and heavy load both.
(D) low at rated load only.
(A) between 11 KV and 33 KV.
(C) between 400 KV and 700 KV.
(A) damping torque.
(B) eddy current torque.
(C) torque aiding the developed torque.
(D) no torque.
(A) A square wave.
(C) A triangular wave.
( B) Pg/(1-s)
(A) is proportional to rotor resistance r2
(B) does not depend on r2
(C) is proportional to sqrt(r2)
(D) is proportional to (r2)2
(C) stationary w.r.t. field.
(A) unity p.f.
(C) lagging p.f.
(C) 3.0 V.
(C) leads the flux by 90 degree.
(A) dc machine.
(C) synchronous machine.
(A) squirrel cage induction motor.
(C) synchronous motor.
(A) is not a self-starting motor.
(C) needs dc excitation.
(A) a dc series motor.
(B) a dc shunt motor.
(C) an ac two-phase induction motor.
(D) an ac series motor.
(A) operating voltage. (B) power factor.
(C) current to be carried. (D) type of insulation used.Ans: CQ.24 Out of the following methods of heating the one which is independent of supply frequency is
(A) Both ω and Ia are doubled.
(A) 1500 r.p.m.
(C) 25 r.p.m.
(C) more or less.
(A) split-phase motor.
(B) capacitor start and capacitor run motor.
(C) universal motor.
(D) capacitor start motor.
(B) provide proper insulation.
(C) prevent the moisture from entering the cable.
(D) avoid chances of rust on strands.
(A) dc motor. (B) induction motor. (C) synchronous motor. (D) universal motor.
(A) 800 rpm. (B) more than 800 rpm. (C) less than 800 rpm. (D) both higher or lower than 800 rpm.
(A) 4. (B) 6. (C) 12. (D) 8.
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