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

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bbad, bad

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c good, bad

✓


d good, good

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View Answer good, bad

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


a induced current flow through the charge

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bhysteresis loss taking place below curie temperature

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

✓


d none of the above factors

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


aseries

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b parallel

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cseries-parallel connections

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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

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bThermocouple

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c Auto-transformer

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d Heating elements of variable resis-tance material

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View Answer Thermocouple

Direct arc furnaces have which of the following power factors ?


aUnity

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bLow, lagging

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cLow, leading

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d Any of the above

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View Answer Low, lagging

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


aThe amount of heat generated can be controlled accurately

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b Heat at very high rate can be gene-rated

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

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dAll of the above

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View Answer All of the above

Radiant heating is used for which of the following ?


a Annealing of metals

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b Melting of ferrous metals

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cHeating of liquids in electric kettle

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dDrying of paints and varnishes

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


acopper alloy

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b carbon

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ctungsten alloy

✓


dstainless steel alloy

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View Answer tungsten alloy

The electrode of a direct arc furnace is made of____________?


atungsten

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bgraphite

✓


csilver

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dcopper

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View Answer graphite

series-parallel operation


aCurrent

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b Voltage

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cPower factor

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d All of the above

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View Answer Current

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