Electric heating and welding objective questions with explanations

Electric heating and welding objective questions with explanations

Q no 1 . Which of the following heating methods has maximum power factor ?

A ) Arc heating

B ) Dielectric heating

C ) Induction heating

D ) Resistance heating

Explanations

                   Answer D ) Resistance heating

Q no 2 . ………………. Method has leading power factor ?

A ) Arc heating

B ) Dielectric heating

C ) Induction heating

D ) Resistance heating

Explanations

                   Answer B ) Dielectric heating

Q no 3 .  Which of the following  methods of heating is not dependent on the frequency of supply ?

A )  Induction heating

B ) dielectric heating

C ) Electric resistance heating

D ) all of the above

Explanations

                   Answer C ) Electric resistance heating

Q no 4 . The process of heat transfer during the re-entry of satellites and missiles at very high speeds ,into earth’s atmosphere is known as

A ) ablation

B ) radiation

C ) viscous dissipation

D ) irradiation

Explanations

                   Answer A ) ablation