A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer
A. Optical pyrometer
B. Mercury thermometer
C. Alcohol thermometer
D. Any of the above
The temperature inside a furnace is usually measured by which of the following ? Read More »
Heating and Welding A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork
A. lower melting point
B. higher temperature coefficient
C. high specific resistance
D. all of the above
The material of the heating element for a furnace should have___________? Read More »
Heating and Welding A. arc heating
B. resistance heating
C. induction heating
D. dielectric heating
In an electric room heat convector the method of heating used is______________? Read More »
Heating and Welding A. Heat treatment of castings
B. Heating of insulators
C. Melting aluminium
D. None of the above
Induction furnaces are employed for which of the following ? Read More »
Heating and Welding 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
A. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt number
A. Thermal ion release principle
B. Nucleate heating principle
C. Resistance heating principle
D. Electro-magnetic induction princi¬ple
Induction heating process is based on which of the following principles ? Read More »
Heating and Welding A. ablation
B. radiation
C. viscous dissipation
D. irradiation
