_________ has the highest value of thermal conductivity?
_________ has the highest value of thermal conductivity?
A. Copper
B. Aluminium
C. Brass
D. Steel
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Which of the following methods is used to control temperature in resistance furnaces ?
Which of the following methods is used to control temperature in resistance furnaces ?A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methodsIn a resistance furnace the atmosphere is_____________?
In a resistance furnace the atmosphere is_____________?A. oxidizing
B. deoxidising
C. reducing
D. neutralIn induction heating ___________ is abnormally high?
In induction heating ___________ is abnormally high?A. phase angle
B. frequency
C. current
D. voltageWhich 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 iceIn an electric press mica is used_____________?
In an electric press mica is used_____________?A. as an insulator
B. as a device for power factor improvement
C. for dielectric heating
D. for induction heatingHeat transfer by condition will not occur when____________?
Heat transfer by condition will not occur when____________?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