Electrical Engineering MCQs

Page No. 174

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


aVoltage drop in transformer reactance


b Voltage drop in resistance of transformer and smoothing chokes


c voltage drop


d All of the above


View Answer All of the above

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


aSix-phase


b Three-phase


cTwo-phase


dSingle-phase


View Answer Six-phase

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


aone-third of a cycle


bone-fourth of a cycle


cone-half a cycle


dtwo-third of a cycle


View Answer one-third of a cycle

In a mercury arc rectifier________ flow from anode to cathode


aions


belectrons


c ions and electrons


dany of the above


View Answer ions

A mercury arc rectifier possesses __________ regulation characteristics


astraight line


bcurved line


cexponential


dnone of the above


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


bdecelerates


cany of the above


dany of the above


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


bIn the output circuit there should be no harmonics


cThe power factor of the system should be high


dall of the above


View Answer all of the above

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


a resistance


bcapacitance


cleakage reactance


dany of the above


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


bsynchronous motor


c induction regulator


dsynchronous generator



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


bcritical grid voltage


cany of the above


dnone of the above


View Answer critical grid voltage

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