MCQs

Transformer MCQ Questions The iron core in transformer provides _____________ path to main flux The iron core in transformer provides _____________ path to main flux: Low reluctance High reluctance High conductivity Low resistance Correct answer: 1. Low reluctance The core flux of practical transformer with the resistance load The core flux of practical transformer with … Read more

Transformer MCQ Questions The efficiency of two identical transformers under load conditions can be determined by which of the following tests The efficiency of two identical transformers under load conditions can be determined by which of the following tests: Back to back test Short circuit test Open circuit test None of these Correct answer: 1. … Read more

The synchronous motor’s V curve is plotted between which of the two given parameters Power factor and speed Field current and speed Armature current and field current None of these Correct answer: 3. Armature current and field current

The maximum power developed in a synchronous motor occurs at a which coupling angle The maximum power developed in a synchronous motor occurs at a which coupling angle: 30° 60° 90°    180° Correct answer: 3. 90°    The maximum power developed in a synchronous motor occurs at a which coupling angle of 90°

Synchronous Generator MCQ Part 5 If prime mover of an alternator supplying load to infinite busbar is suddenly shutdown, then it will If prime mover of an alternator supplying load to infinite busbar is suddenly stutdown, then it will: Stop Run as motor in same direction Run as motor in opposite direction Run same as … Read more

Of given conditions which of following is not necessary to be satisfied for synchronizing an incoming alternator to an already operating alternator Of given conditions which of the following is not necessary to be satisfied for synchronizing an incoming alternator to an already operating alternator: Same phase sequence Same frequency Same voltage magnitude Same prime … Read more

Synchronous Generator MCQ Part 3 Salient pole rotors are generally recommended for which machine construction Salient pole rotors are generally recommended for which machine: 2 pole 4 pole 6 pole 8 pole Correct answer: 4. 8 pole Salient pole alternator construction design for withstanding the stresses at high speeds is difficult to implement, therefore a … Read more

Synchronous Generator MCQ Part 2 Very often alternators are connected in parallel because Very often alternators are connected in parallel because: It makes repairing convenient It is easy to install or remove units when necessary It increases reliability of power system All of these Correct answer: 4. All of these Of two parallel operating alternators, … Read more

Damper windings are employed in alternator to Damper windings are employed in alternator to: Reduce windage losses Parallel multiple alternators Prevent hunting Achieve synchronism 2 & 4 Correct answer: 3. Prevent hunting When the alternator operates at a load power factor of unity, the effect of armature reaction is When the alternator operates at a … Read more