# Objective Questions on Principle of DC Generator

1. For a linear electromagnetic circuit, which of the following statement is true?

Under construction.

2. The polarity of a DC generator can be reversed by

Under construction.

3. The principle of dynamically induced emf is utilized in

Under construction.

4. Emf induced in a coil rotating in a uniform magnetic field will be maximum when the

Under construction.

5. The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends

Under construction.

6. Magnetic field in a DC generator is produced by

Under construction.

7. When Fleming's right hand rule to find the direction of induced emf, the thumb points towards

Under construction.

8. If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

Under construction.

9. In a DC generator, if p be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

Under construction.

10. If an electric current carrying coil is placed in a uniform magnetic field direction of magnetic induction, then

Under construction.

11. A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur?

Under construction.

12. In a DC machine

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13. The emf induced in a conductor rotating in a bipolar field is

Under construction.

14. The armature of DC generator is laminated to

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15. The resistance of armature winding depends on

Under construction.

16. In Dc generators, electric current to the external circuit from armature is given through

Under construction.

17. Armature of DC machine is made of

Under construction.

18. In an ideal DC generator the regulation is

Under construction.

19. In a DC generator if field winding attains the critical resistance

Under construction.

20. In a DC machine, the angle between the stator and rotor fields is

Under construction.