MCQ AC Generator, Class 12 Physics

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. The factor, on which the frequency of an AC generator depends,

Material of generator

Speed of rotation

Area of coil

Number of turns in coil

Your comments:

Question 1 of 10

2. AC generator produces

alternating current from mechanical energy

alternating current from electrical energy

alternating current from kinetic energy

alternating current from chemical energy

Your comments:

Question 2 of 10

3. Which of the following is used to determine the direction of induced current in a generator?

Fleming's left hand rule

Ampere's swimming rule

Maxwell's corkscrew rule

Fleming's right hand rule

Your comments:

Question 3 of 10

4. Efficiency of electric motor is always less than

75%

50%

100%

25%

Your comments:

Question 4 of 10

5. Induced e.m.f is given by it will be maximum when ,

A

B

C

D

Your comments:

Question 5 of 10

6. Which of the following does not form a part of alternator?

Field magnets

Armature

Split rings

Brushes

Your comments:

Question 6 of 10

7. Which is not true for three phase AC?

Output of three phase AC is greater than the one phase and two phase

Has 100% efficiency.

Output of three phase AC is constant

Its more economical

Your comments:

Question 7 of 10

8. What is form factor?

A

B

C

D

Your comments:

Question 8 of 10

9. In a three phase generator

we obtain two alternating e.m.fs differing in phase from one another by 60°

we obtain six alternating e.m.fs differing in phase from one another by 60°

we obtain three alternating e.m.fs differing in phase from one another by 60°

we obtain three alternating e.m.fs differing in phase from one another by 90°

Your comments:

Question 9 of 10

10. The magnitude of induced e.m.f. is maximum, when the plane of the armature of a.c. dynamo is:

anti- parallel to the magnetic lines of force

makes some particular angle θ to the magnetic lines of force

perpendicular to the magnetic lines of force

parallel to the magnetic lines of force

Your comments:

Question 10 of 10

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