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Alternators(Engineering > Electrical Engineering ) Questions and Answers
Home
Topic
Engineering
Electrical Engineering
Alternators
Question 1.
The voltage regulation of an alternator depends on
Both load current and pf
Power factor only
None of the listed here
Load current only
Explanation:-
Answer: Option A. ->
Both load current and pf
Question 2.
Armature winding of an alternator are generally
Partly open and partly closed windings
Closed winding
Open winding
None of the listed here
Explanation:-
Answer: Option C. ->
Open winding
Question 3.
Iron and friction losses of an alternator can be measured by a
Transformer
None of the listed here
Rectifier
Dc motor
Explanation:-
Answer: Option D. ->
Dc motor
Question 4.
Copper losses of an alternator can be measured by
Rectifier
Dc motor
None of the listed here
Transformer
Explanation:-
Answer: Option B. ->
Dc motor
Question 5.
Majority of the alternators are
Three phase
Single phase
None of the listed here
Two phase
Explanation:-
Answer: Option A. ->
Three phase
Question 6.
The losses in an alternator are the same as in
A transformer
None of the listed here
A rectifier
A dc machine
Explanation:-
Answer: Option D. ->
A dc machine
Question 7.
A two pole alternator is running at 1500 rpm. Its angular velocity is ______
118 rad/s
212 rad/s
192 rad/s
157 rad/s
Explanation:-
Answer: Option D. ->
157 rad/s
Question 8.
If the number of poles of an alternator is increased, the generated emf
Remains the same
Increases
None of the listed here
Decreases
Explanation:-
Answer: Option B. ->
Increases
Question 9.
An alternator supplying power to a load with a leading power factor always has ______ voltage regulation.
Zero
Unity
Positive
Negative
Explanation:-
Answer: Option D. ->
Negative
Question 10.
For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles.
4
12
2
8
Explanation:-
Answer: Option C. ->
2
1
2
3
4
5
6
7
8
9
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