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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The material of the heating element for a furnace should have___________?
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 aboveIn arc furnace the function of choke is______________?
In arc furnace the function of choke is______________?A. to stabilize the arc
B. to imprpve, power factor
C. to reduce severity of the surge
D. none of the aboveFor 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 heatingIn the indirect resistance heating method, maximum heat-transfer takes place by____________?
In the indirect resistance heating method, maximum heat-transfer takes place by____________?A. radiation
B. convection
C. conduction
D. any of the aboveFor intermittent work which of the following furnaces is suitable ?
For intermittent work which of the following furnaces is suitable ?A. Indirect arc furnace
B. Core less furnace
C. Either of the above
D. None of the aboveIn heating the ferromagnetic material by induction heating, heat is produced due to_____________?
In heating the ferromagnetic material by induction heating, heat is produced due to_____________?A. induced current flow through the charge
B. hysteresis loss taking place below curie temperature
C. due to hysteresis loss as well as eddy current loss takingplace in the charge
D. none of the above factors