RECTIFIERS AND CONVERTERS QUIZ

The internal efficiency of a mercury arc rectifier depends on

voltage and current

voltage only

r.m.s. value of current

current only

TRUE ANSWER : ?
YOUR ANSWER : ?

In a mercury arc rectifier characteristic blue luminosity is due to

electron streams

ionization

high temperature

colour of mercury

TRUE ANSWER : ?
YOUR ANSWER : ?

In which of the following applications, direct current is absolutely essential ?

Traction

Electrolysis

Illumination

Variable speed operation

TRUE ANSWER : ?
YOUR ANSWER : ?

In selenium rectifiers efficiencies ranging from to percent are attainable

40, 50

30, 60

20, 30

75, 85

TRUE ANSWER : ?
YOUR ANSWER : ?

In phase-shift control method the control is carried out by varying the of grid voltage.

All of the listed here

magnitude

phase

polarity

TRUE ANSWER : ?
YOUR ANSWER : ?

In a single phase rotary converter the number of slip rings will be

Two

Four

Six

Three

TRUE ANSWER : ?
YOUR ANSWER : ?

A mercury arc rectifier possesses ________ regulation characteristics

none of the listed here

straight line

curved line

exponential

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the loss within the mercury arc rectifier chamber?

All of the listed here

Voltage drop at the cathode

Voltage drop at the anode

Voltage drop in arc

TRUE ANSWER : ?
YOUR ANSWER : ?

In which of the following equipment direct current is needed?

Telephones

Time switches

All of the listed here

Relay

TRUE ANSWER : ?
YOUR ANSWER : ?

Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of

400 A at 400 V

500 A at 500 V

300 A at 300 V

100 A at 100 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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