Quiz sheet for generators

A compound generator has a shunt and series winding on each pole core. If both coil currents are in the same direction around the pole coil, the generator is:

A) cumulatively compounded

B) zero compounded

C) shunt compounded

D) differentially compounded

ANSWER: A

A curve showing the relationship between generated emf and field current for a generator, is called:

A) excitation characteristic

B) an open-circuit characteristic

C) a load characteristic

D) a field resistance characteristic

ANSWER: A

A tacho generator is a:

A) permanent magnet machine

B) stepper motor

C) series motor

D) shunt machine

ANSWER: A

A type of generator that will not work without a connected load is:

A) series

B) separately excited

C) shunt

D) compound

ANSWER: A

An increase in field strength in a d.c. generator causes:

A) an increase in e.m.f.

B) a decrease in e.m.f.

C) an increase in velocity

D) a decrease in velocity

ANSWER: A

As the load on a shunt wound generator increases the terminal voltage

A) decreases

B) increased

C) is unaffected

D) begins to hunt

ANSWER: A

If the shunt field is disconnected from a shunt connected generator there will still be some voltage produced due to 

A) residual magnetism

B) left over voltage 

C) voltage bing already established

D) good luck

ANSWER: A

Increasing the speed of a DC generator will cause

A) increased voltage

B) reduced voltage 

C) dangerous voltage

D) short circuits

ANSWER: A

The direction of rotation of a stepper motor is determined by:

A) the sequence in which the stator pole windings are energised

B) the current through the poles

C) the number of pulses applied to the stator

D) the polarity of the supply

ANSWER: A

Which of the following is a variable loss in a generator:

A) copper losses

B) windage

C) shunt field loss

D) friction

ANSWER: A

Last modified: Tuesday, 1 June 2021, 9:18 AM