Which of the following has the highest value of thermal conductivity ?
Which of the following has the highest value of thermal conductivity ?
A. Water
B. Steam
C. Sold ice
D. Melting ice
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In resistance heating highest working temperature is obtained from heating elements made of_____________?
In resistance heating highest working temperature is obtained from heating elements made of_____________?A. nickel copper
B. nichrome
C. silicon carbide
D. silverIn a domestic cake baking oven the temperature is controlled by________________?
In a domestic cake baking oven the temperature is controlled by________________?A. voltage variation
B. thermostat
C. auto-transformer
D. series-parallel operationWhich of the following heating methods has maximum power factor ?
Which of the following heating methods has maximum power factor ?A. Arc heating
B. Dielectric heating
C. Induction heating
D. Resistance heatingInduction furnaces are employed for which of the following ?
Induction furnaces are employed for which of the following ?A. Heat treatment of castings
B. Heating of insulators
C. Melting aluminium
D. None of the aboveWhich of the following insulating materials was suitable for low temperature applications ?
Which of the following insulating materials was suitable for low temperature applications ?A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. CorkWhen a body reflects entire radiation incident on it, then it is known as____________?
When a body reflects entire radiation incident on it, then it is known as____________?A. white body
B. grey body
C. black body
D. transparent body