Electrical Engineering MCQs for competitive tests, job tests, university exams are provided on various Electrical and Electronics topics.
Synchronous Generator MCQs Part 7 The stator of an alternator is identical to which of following machines The stator of an alternator is identical to which of following machines: DC Generator 1-phase induction motor 3-phase induction motor Rosenberg generator Correct answer: 3. 3-phase induction motor With the size of the machine, the full-load efficiency of … Read more
Synchronous Generator MCQs Part 6 If number of poles of alternator is increased, the generated EMF If number of poles of alternator is increased, the generated EMF: Increases Decreases Remains constant None of these Correct answer: 1. Increases Explanation: EMF generated per phase E = 2.22 fZΦ f = NP/120 The relative speed between the … Read more
Synchronous Generator MCQs Part 5 In an alternator, the salient-pole construction for field structure is generally used for machine having In an alternator, the salient-pole construction for field structure is generally used for machine having: 2-poles 4-poles 8-poles none of above Correct answer: 3. 8-poles The EMF generated in an 8-pole alternator running at 900 … Read more
Synchronous Generator MCQs Part 4 The field winding of alternator is excited with The field winding of alternator is excited with AC DC Both of these None of these Correct answer: 2. DC The rotor of turbo-alternator is made cylindrical in order to reduce The rotor of turbo-alternator is made cylindrical in order to reduce … Read more
Synchronous Generator MCQs Part 3 High-speed alternators are driven using High-speed alternators are driven using: Steam engines Steam turbines Hydraulic turbines None of these Correct answer: 2. Steam turbines If the excitation of an alternator operating in parallel with other alternators is decreased, then If the excitation of an alternator operating in parallel with other … Read more
Synchronous Generator MCQs Part 2 On the majority of alternators in use, they have On the majority of alternators in use, they have: Stationary field type construction Revolving field type construction Revolving AC armature winding None of the above Correct answer: 2. Revolving field type construction Voltage regulation of an alternator supplying resistive or inductive … Read more
Power Generation MCQs Part 31 A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s. The reservoir has an area of 6400 km². The available hydroelectric power is: 4459MW 2229.5MW 1114.75MW … Read more
Power Generation MCQs Part 30 An alternator alters _________ to __________ An alternator alters _________ to __________: Mechanical energy, Electrical Energy Electrical energy, Mechanical Energy Electrical energy, Chemical energy Heat energy, Electrical energy Correct answer: 1. Mechanical energy, Electrical energy Mechanical energy is supplied to a DC generator at rate of 90 J/s Mechanical energy … Read more
Transformer MCQs Part 24 The steel used for transformer core has The steel used for transformer core has: Low hysteresis losses High permeability High silicon content All of these Correct answer: 4. All of these The all-day efficiency of transformer is also known as its The all-day efficiency of transformer is also known as its: … Read more
Transformer MCQs Part 23 A transformer has full load copper losses of 400 W. The copper loss at half of full-load will be A transformer has full load copper losses of 400 W. The copper loss at half of full-load will be: Correct answer: 3. 400 W Soution: Copper losses vary as square of current … Read more