Alternators(Engineering > Electrical Engineering ) Questions and answers for exam Preparation

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