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MCQs 1: Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?

To avoid initial rush of current To avoid change in kW rating with temperature Both (A) and (B) Either (A) or (B)
Answer Explanation

MCQs 2: It is desirable to operate the arc furnaces at power factor of_____________?

zero 0.707 lagging unity 0.707 leading
Answer Explanation

MCQs 3: Ajax Wyatt furnace is started when____________?

it is filled below core level it is filled above core level it is fully empty none of the above
Answer Explanation

MCQs 4: Radiations from a black body are proportional to____________?

T1 T2 T3 T*
Answer Explanation

MCQs 5: Which of the following methods is used to control temperature in resistance furnaces ?

Variation of resistance Variation of voltage Periodical switching on and off of the supply All of the above methods
Answer Explanation

MCQs 6: In arc furnace the function of choke is______________?

to stabilize the arc to imprpve, power factor to reduce severity of the surge none of the above
Answer Explanation

MCQs 7: Hysteresis loss and eddy current loss are used in____________?

induction heating of steel dielectric heating induction heating of brass resistance heating
Answer Explanation

MCQs 8: In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity?

bad, good bad, bad good, bad good, good
Answer Explanation

MCQs 9: In heating the ferromagnetic material by induction heating, heat is produced due to_____________?

induced current flow through the charge hysteresis loss taking place below curie temperature due to hysteresis loss as well as eddy current loss takingplace in the charge none of the above factors
Answer Explanation

MCQs 10: Resistance variation method of temperature control is done by connecting resistance elements in_____________?

series parallel series-parallel connections star-delta connections all of the above ways
Answer Explanation

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