ALTERNATORS QUIZ

The magnitude of emf generated by an alternators depends on ______

All of the listed here

Flux per pole

Rotor speed

Number of poles

TRUE ANSWER : ?
YOUR ANSWER : ?

The losses in an alternator are the same as in

None of the listed here

A transformer

A rectifier

A dc machine

TRUE ANSWER : ?
YOUR ANSWER : ?

Modern 3-phase alternator of a central power station will have generated voltage of

400 V

11 kV

230 V

132 kV

TRUE ANSWER : ?
YOUR ANSWER : ?

A two pole alternator is running at 1500 rpm. Its angular velocity is ______

192 rad/s

212 rad/s

157 rad/s

118 rad/s

TRUE ANSWER : ?
YOUR ANSWER : ?

The voltage regulation of an alternator depends on

Load current only

Both load current and pf

Power factor only

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Turbo alternators have rotors of _______

Large diameter and small axial length

Small diameter and long axial length

Same diameter and axial length

Large diameter and long axial length

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of a uniformly distributed winding, the value of distribution factor is

0.85

0.995

0.65

0.76

TRUE ANSWER : ?
YOUR ANSWER : ?

In an alternator, the frequency of voltage generated depend on

Number of poles only

Rotative speed only

Both rotative speed and number of poles

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The distribution of load between two alternators operating in parallel can be changed by changing ______

Field excitation of alternators

None of the listed here

Phase sequence

Driving torques of prime movers

TRUE ANSWER : ?
YOUR ANSWER : ?

An under excited alternator supplies _______

None of the listed here

Lagging VAR

No reactive power

Leading VAR

TRUE ANSWER : ?
YOUR ANSWER : ?

↑