Heating And Welding MCQ Questions & Answers | Electrical Engineering

A. Asbestos paper

B. Diatomaceous earth

C. 80 percent magnesia

D. Cork

A. By disconnecting some of the heating elements

B. By varying the operating voltage

C. By varying the current through heating elements

D. By any of the above method

A. Variation of resistance

B. Variation of voltage

C. Periodical switching on and off of the supply

D. All of the above methods

A. Zero

B. 0.707 lagging

C. Unity

D. 0.707 leading

A. True

B. False

A. Series

B. Parallel

C. Series-parallel connections

D. All of the above ways

A. Induced current flow through the charge

B. Hysteresis loss taking place below Curie temperature

C. Due to hysteresis loss as well as eddy current loss taking place in the charge

D. None of the above factors

A. Quicker operation

B. Higher efficiency

C. Absence of flue gases

D. All of the above

A. Voltage variation

B. Thermostat

C. Autotransformer

D. Series-parallel operation

A. Heat loss through furnace wall will increase

B. Temperature inside the furnace will fall

C. Temperature on the outer surface of furnace walls will drop

D. Energy consumption will increase