Electrical Engineering MCQs

Page No. 145

In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity?


a bad, good


bbad, bad


c good, bad


d good, good


View Answer good, bad

In heating the ferromagnetic material by induction heating, heat is produced due to_____________?


a induced current flow through the charge


bhysteresis loss taking place below curie temperature


cdue to hysteresis loss as well as eddy current loss takingplace in the charge


d none of the above factors



Resistance variation method of temperature control is done by connecting resistance elements in_____________?


aseries


b parallel


cseries-parallel connections


dall of the above ways


View Answer all of the above ways

Which of the following devices is necessarily required for automatic temperature control in a furnace ?


aThermostat


bThermocouple


c Auto-transformer


d Heating elements of variable resis-tance material


View Answer Thermocouple

Direct arc furnaces have which of the following power factors ?


aUnity


bLow, lagging


cLow, leading


d Any of the above


View Answer Low, lagging

Which of the following is an advantage of eddy current heating ?


aThe amount of heat generated can be controlled accurately


b Heat at very high rate can be gene-rated


c The area of the surface over which heat is produced can be accurately controlled


dAll of the above


View Answer All of the above

Radiant heating is used for which of the following ?


a Annealing of metals


b Melting of ferrous metals


cHeating of liquids in electric kettle


dDrying of paints and varnishes



For radiant heating around 2250°C, the heating elements are made of____________?


acopper alloy


b carbon


ctungsten alloy


dstainless steel alloy


View Answer tungsten alloy

The electrode of a direct arc furnace is made of____________?


atungsten


bgraphite


csilver


dcopper


View Answer graphite

series-parallel operation


aCurrent


b Voltage


cPower factor


d All of the above


View Answer Current

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