Electrical Engineering MCQs

Page No. 174

When a rectifier is loaded which of the following voltage drops take place ?


aVoltage drop in transformer reactance

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b Voltage drop in resistance of transformer and smoothing chokes

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c voltage drop

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d All of the above

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View Answer All of the above

Which of the following mercury arc rectifier will deliver least undulating current?


aSix-phase

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b Three-phase

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cTwo-phase

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dSingle-phase

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View Answer Six-phase

In a three-phase mercury arc rectifiers each anode conducts for____________?


aone-third of a cycle

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bone-fourth of a cycle

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cone-half a cycle

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dtwo-third of a cycle

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View Answer one-third of a cycle

In a mercury arc rectifier________ flow from anode to cathode


aions

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belectrons

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c ions and electrons

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dany of the above

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View Answer ions

A mercury arc rectifier possesses __________ regulation characteristics


astraight line

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bcurved line

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cexponential

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dnone of the above

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View Answer none of the above

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.


aaccelerates

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bdecelerates

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cany of the above

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dany of the above

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View Answer accelerates

On which of the following factors the number of phases for which a rectifier should be designed depend ?


aThe voltage regulation of the rec¬tifier should be low

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bIn the output circuit there should be no harmonics

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cThe power factor of the system should be high

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dall of the above

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View Answer all of the above

It is the_________of the transformer on which the magnitude of angle of overlap depends?


a resistance

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bcapacitance

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cleakage reactance

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dany of the above

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View Answer leakage reactance

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


ashunt motor

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bsynchronous motor

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c induction regulator

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dsynchronous generator

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In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?


amaximum grid voltage

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bcritical grid voltage

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cany of the above

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dnone of the above

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View Answer critical grid voltage

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