Electrical Engineering MCQs

Page No. 176

In a mercury arc rectifier, the anode is usually made of_____________?


acopper

✖


baluminium

✖


csilver

✖


dgraphite

✓


View Answer graphite

Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?


aCopper oxide rectifiers

✖


bSelenium rectifiers

✓


c Mercury arc rectifiers

✖


dMechanical rectifiers

✖


View Answer Selenium rectifiers

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


aVoltage drop in arc

✖


bVoltage drop at the anode

✖


cVoltage drop at the cathode

✖


dAll of the above

✓


View Answer All of the above

Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?


aMechanical rectifiers

✖


bCopper oxide rectifiers

✖


cSelenium rectifiers

✖


dElectrolytic rectifiers

✓



The efficiency of an electrolytic rectifier is nearly____________?


a80%

✖


b 70%

✖


c60%

✓


d 40%

✖


View Answer 60%

The ignited or auxiliary anode in mercury arc rectifier is made of____________?


agraphite

✖


bboron carbide

✓


caluminium

✖


dcopper

✖


View Answer boron carbide

The polarity of the induced voltage can be determined by using the left-hand generator rule


a Yes

✓


b No

✖


cNone of these

✖


dNone of the above

✖


View Answer Yes

Reversing the field or the current will reverse the force on the conductor


aYes

✓


b No

✖


cNone of these

✖


dNone of the above

✖


View Answer Yes

The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns


aYes

✖


bNo

✓


cNone of these

✖


dnone of the above

✖


View Answer No

Which circuit element(s) will oppose the change in circuit current ?


aResistance only

✖


bInductance only

✓


c Capacitance only

✖


d Inductance and capacitance

✖


View Answer Inductance only

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