Quiz sheet for electromagnetic devices

A DC generator converts ______ energy to ______ energy.

A) mechanical, electrical

B) chemical, electrical

C) electrical, electrical

D) electrical, mechanical

ANSWER: A

A DC motor converts ______ energy to ______ energy.

A) electrical, mechanical

B) electrical, electrical

C) chemical, electrical

D) mechanical, electrical

ANSWER: A

EMF developed by generator depends upon

A) length of rotating wire

B) area of rotating wire

C) radius of wire

D) size of magnet

ANSWER: A

Power is transmitted over long distances and high voltages in order to

A) minimize the energy loss

B) maximize the energy loss

C) make energy content constant

D) preserve energy

ANSWER: A

Production of induced current in one coil due to production of current in neighboring coil is

A) mutual induction

B) electromagnetism

C) induction

D) steady current

ANSWER: A

The principle by which emf's are generated in a DC generator is:

A) electromagnetic induction.

B) Lenz's law

C) self inductance.

D) chemical reaction.

ANSWER: A

The windings for the magnetic field system are mounted on the:

A) Poles.

B) Frame.

C) Commutator.

D) Armature.

ANSWER: A

To increase the output of a generator you could either ______ the field current or ______ the armature speed.

A) increase, increase

B) decrease, decrease

C) increase, decrease

D) decrease, increase

ANSWER: A

Transformers are used to

A) both increace and decrease AC

B) increase AC

C) decrease AC

D) keep AC constant

ANSWER: A

Transformers only work with

A) AC

B) DC

C) charges

D) radioactive substances

ANSWER: A

Last modified: Tuesday, 1 June 2021, 9:26 AM