RECTIFIERS AND CONVERTERS QUIZ

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

phase

All of the listed here

magnitude

polarity

TRUE ANSWER : ?
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Copper oxide rectifier is usually designed not to operate above

75°C

55°C

30°C

45°C

TRUE ANSWER : ?
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Which of the following is reversible in action?

All of the listed here

Motor converter

Rotary converter

Motor generator set

TRUE ANSWER : ?
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In a mercury arc rectifier characteristic blue luminosity is due to

high temperature

colour of mercury

ionization

electron streams

TRUE ANSWER : ?
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In a single phase rotary converter the number of slip rings will be

Six

Three

Four

Two

TRUE ANSWER : ?
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In a three-phase mercury arc rectifiers each anode conducts for

One-half a cycle

One-third of a cycle

One-fourth of a cycle

Two-third of a cycle

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The potential drop in the arc, in a mercury arc rectifier, varies

0.5 V to 1.5 V per cm length of the arc

none of the listed here

0.05 V to 0.2 V per cm length of the arc

2 V to 3.5 V per cm length of the arc

TRUE ANSWER : ?
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A rotary converter operates at a

zero power factor

None of the listed here

low power factor

high power factor

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Which of the following are the applications of D.C. system?

All of the listed here

Battery charging work

Arc welding

Electrolytic and electro-chemical processes

TRUE ANSWER : ?
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The efficiency of the copper oxide rectifier seldom exceeds

85 to 90%

90 to 95%

80 to 85%

65 to 75%

TRUE ANSWER : ?
YOUR ANSWER : ?

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