File Name: dc generator question and answer .zip
- 37 Question & Answers on DC Generators.pdf
- Second Year D.C. Generator MCQ Question | D. C. generator mcq question and answer
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Cast iron. Cumulatively compounded long shunt.
The material for commutator brushes is generally a mica b copper c cast iron d carbon Ans: d. The insulating material used between the commutator segments is normally a graphite b paper c mica d insulating varnish Ans: c. If brushes of a D. Armature reaction of an unsaturated D. Iron losses in a D.
37 Question & Answers on DC Generators.pdf
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When you're interviewing for a new position, you should come prepared to answer the interview questions to win in first attempt. To be precise about a generator is a device that changes motive power into electrical power for use in an external circuit. Question 1. What Is A Generator? Question 2. Question 3. Answer : First Law: Whenever a conductor cuts magnetic flux and E. F is induced in that conductor. Second Law : The magnitude of the induced e. Question 4. Question 5.
Answer : In an AC Generator the field is rotating and the armature is stationary whereas in DC Generator the field is stationary and the armature is rotating. Question 6. Answer : It is easy to take output from the stationary armature. It is easier to insulate stationary armature for higher voltage. Low voltage excitation supply can be easily supplied to the rotor through slip rings. Question 7. Question 8. Question 9. Question Windage loss is low.
Low noise. Heat transfer co efficient is 1. Thermal conductivity is 7 times higher than air. Answer : It is the ratio of the field current required to produce rated voltage on open circuit to the field current required to circulate rated current on short circuit. Answer : Over Current protection is not considered necessary for modern alternators because these are capable of withstanding a complete short circuit at their terminals for sufficient time without much over heating and damage.
Answer : Merz-Price protection is differential protection provided for the alternator. The relays used in the Merz-Price protection system of alternator are instantaneous electro-magnetic type protection. Answer : Large capacity of alternators are typically provided with resistance grounding.
High value of resistor is connected to the neural path to the ground. If the generator is delta connected, then it is grounded with the help of zig-zag transformer or Delta-Star transformer such that a high resistor is connected between the neutral point and the ground. Resistance grounding is provided so as to limit the short circuit current flowing during earth fault to stator winding in order to provide protection against mechanical stresses and melting of winding during Line to Ground short circuit.
In large generators fault current is limited as low as 10 to 15 amperes during short circuit. Answer : The coils of the modern alternators are single turn and therefore it is not necessary to provide protection for turn to turn faults.
Answer : In the event of fault on the generator windings even though the generator circuit breaker is tripped, the fault is continuous to fed as long as the excitation will exist because the emf is induced in the generator.
Hence it is necessary to suppress the field immediately after disconnecting the faulty generator from the system. Answer : The over voltage occurs when the prime mover speed increases due to sudden loss of the load on the generator and the speed control governors in case of turbo-generators are very sensitive to the speed variations and therefore generator over voltage of significant duration or magnitude does not generally occur.
This is the reason why generators are not provided with over voltage protection. Popular Interview Questions. All Interview Questions. Generator Practice Test. IT Skills. Management Skills. Communication Skills. Business Skills. Digital Marketing Skills. Human Resources Skills. Health Care Skills. Finance Skills. All Courses. All Practice Tests. Generator Operator Interview Questions Question 6. Answer : Double star connection. Answer : Answer : Hydrogen.
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Second Year D.C. Generator MCQ Question | D. C. generator mcq question and answer
February 18, Generator MCQ Question,d c generator mcq question and answer. What are the rotating parts of the D. Ans:- These parts of the following :. Which types of material e. Ans:- They are made of carbon, copper or carbon and copper alloy.
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Mechanical Engineering 1. MCQ Practice Tests. Timed Mock Tests.
The armature of D. The resistance of armature winding depends on a length of conductor b cross-sectional area of the conductor c number of conductors d all of the above Ans: d.