Electrical Engineering MCQs

Page No. 172

In a rotary converter armature currents are______________?


ad.c. only


ba.c. only


cpartly a.c. and partly d.c.


dNone of them



In which of the following appUcations, direct current is absolutely essential ?


aIllumination


bElectrolysis


cVariable speed operation


dTraction


View Answer Electrolysis

In a mercury arc rectifier positive ions are attracted towards______________?


aanode


bcathode


cshell bottom


dmercury pool


View Answer cathode

In which of the following equipment direct current is needed ?


aTelephones


b Relays


cTime switches


dAll of the above


View Answer All of the above

Which of the following AC. motors is usually used in large motor-generator sets?


aSynchronous motor


bSquirrel cage induction motor


cSlip ring induction motor


d Any of the above


View Answer Synchronous motor

In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?


asame


b less


cdouble


dthree times


View Answer less

The potential drop in the arc, in a mercury arc rectifier, varies_____________?


a0.05 V to 0.2 V per cm length of the arc


b 0.5 V to 1.5 V per cm length of the arc


c2 V to 3.5 V per cm length of the arc


dnone of the above



Mercury, in arc rectifiers, is chosen for cathode because________________?


aits ionization potential is relatively low


b its atomic weight is quite high


cits boiling point and specific heat are low


dall of the above


View Answer all of the above

Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?


a100 A at 100 V


b200 A at 200 V


c400 A at 400 V


d500 A at 500 V


View Answer 500 A at 500 V

The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?


aexpenditure of energy in ionization


b surface resistance


cexpenditure of energy in overcoming the electrostatic field


dexpenditure of energy in liberating electrons from the mercury



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