In a resistance furnace the atmosphere is_____________?
In a resistance furnace the atmosphere is_____________?
A. oxidizing
B. deoxidising
C. reducing
D. neutral
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The electrode of a direct arc furnace is made of____________?
The electrode of a direct arc furnace is made of____________?A. tungsten
B. graphite
C. silver
D. copperBy which of the following methods the temperature inside arc nace can be varied ?
By which of the following methods the temperature inside arc nace can be varied ?A. By disconnecting some of the heating elements
B. By varying the operating voltage
C. By varying the current through heating elements
D. By any of the above methodWhich 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 direct arc furnace, which of the following has high value ?
In direct arc furnace, which of the following has high value ?A. Current
B. Voltage
C. Power factor
D. All of the aboveProperly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?
Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?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)A non-dimensional number generally associated with natural convection heat transfer is____________?
A non-dimensional number generally associated with natural convection heat transfer is____________?A. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt number