Which of the following devices is necessarily required for automatic temperature control in a furnace?
A. Thermostat
B. Thermocouple
C. Autotransformer
D. Heating elements of variable resistance material
Answer: Option B
This Question Belongs to Electrical Engineering >> Heating And Welding
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A. To avoid initial rush of current
B. To avoid change in kW rating with temperature
C. Both (A) and (B)
D. Either (A) or (B)
The material of the heating element for a furnace should have
A. Lower melting point
B. Higher temperature coefficient
C. High specific resistance
D. All of the above
In induction heating __________ is abnormally high.
A. Phase angle
B. Frequency
C. Current
D. Voltage
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