RECTIFIERS AND CONVERTERS QUIZ

A mercury arc rectifier possesses ________ regulation characteristics

curved line

exponential

none of the listed here

straight line

TRUE ANSWER : ?
YOUR ANSWER : ?

In which of the following equipment direct current is needed?

Time switches

Relay

Telephones

All of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

The internal efficiency of a mercury arc rectifier depends on

current only

voltage only

voltage and current

r.m.s. value of current

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YOUR ANSWER : ?

A commutating rectifier consists of commutator driven by

A D.C. series motor

An induction motor

A D.C. shunt motor

A synchronous motor

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Illumination

Electrolysis

Variable speed operation

Traction

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In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

none of the listed here

accelerates

any of the listed here

decelerates

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following AC. motors is usually used in large motor-generator sets?

Slip ring induction motor

Any of the listed here

Synchronous motor

Squirrel cage induction motor

TRUE ANSWER : ?
YOUR ANSWER : ?

Mercury, in arc rectifiers, is chosen for cathode because

Its atomic weight is quite high

Its ionization potential is relatively low

Its boiling point and specific heat are low

All of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following methods may be used to convert A.C. system to D.C.?

Rectifiers

Rotary converters

All of the listed here

Motor converters

TRUE ANSWER : ?
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In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of

Synchronous generator

Synchronous motor

Induction regulator

Shunt motor

TRUE ANSWER : ?
YOUR ANSWER : ?

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