A fixed electromagnet that creates braking torque which acts on a squirrel-cage rotor describes a magnetic a. field. wire. brake (eddy-current…

A fixed electromagnet that creates braking torque which acts on a squirrel-cage rotor describes a magnetic

a. field.

b. wire.

c. brake (eddy-current brake).

d. flux.

2. When a squirrel-cage induction motor turns faster than the synchronous speed determined by the AC network, it

a. consumes active and reactive power.

b. consumes active power and supplies reactive power.

c. supplies active power and supplies reactive power.

d. supplies active power and consumes reactive power.

3. A squirrel-cage induction motor always requires

a. reactive power to create the rotating magnetic field.

b. active power to create the rotating magnetic field.

c. a source of dc power to operate correctly.

d. a prime mover to help it start.

4. The speed of a squirrel-cage induction motor operating as an asynchronous generator

a. is less than the synchronous speed.

b. is equal to the synchronous speed.

c. is greater than the synchronous speed.

d. depends on the direction of rotation.

5. What will be the output voltage of an asynchronous generator turning at synchronous speed if the generator is not connected to an AC source?

a. It will be zero except for a small voltage due to residual magnetism.

b. It will depend on the direction of rotation.

c. It will equal the nominal voltage rating of the generator.

d. It will be much higher than if the generator were connected to

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