Category: Heating and Welding

A. nickel copper
B. nichrome
C. silicon carbide
D. silver

A. Indirect arc furnace
B. Core less furnace
C. Either of the above
D. None of the above

A. white body
B. grey body
C. black body
D. transparent body

A. phase angle
B. frequency
C. current
D. voltage

A. reduce the length of heating element
B. increase the life of the heating element
C. reduce the effect of oxidation
D. produce large amount of heat

A. The 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
D. All of the above

A. zero
B. 0.707 lagging
C. unity
D. 0.707 leading

A. Quicker operation
B. Higher efficiency
C. Absence of flue gases
D. All of the above

A. Optical pyrometer
B. Mercury thermometer
C. Alcohol thermometer
D. Any of the above

A. bodies are kept in vacuum
B. bodies are immersed in water
C. bodies are exposed to thermal radiations
D. temperatures of the two bodies are identical