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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