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. copper
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Direct arc furnaces have which of the following power factors ?
Direct arc furnaces have which of the following power factors ?A. Unity
B. Low, lagging
C. Low, leading
D. Any of the aboveIn 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. silverFor the transmission of heat from one body to another__________?
For the transmission of heat from one body to another__________?A. temperature of the two bodies must be different
B. both bodies must be solids
C. both bodies must be in contact
D. at least one of the bodies must have some source of heatingInduction heating process is based on which of the following principles ?
Induction heating process is based on which of the following principles ?A. Thermal ion release principle
B. Nucleate heating principle
C. Resistance heating principle
D. Electro-magnetic induction princi¬pleProperly 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)By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer