A. Copper
B. Aluminium
C. Brass
D. Steel
Related Mcqs:
- Which of the following has the highest value of thermal conductivity ?
A. Water
B. Steam
C. Sold ice
D. Melting ice - In resistance heating highest working temperature is obtained from heating elements made of_____________?
A. nickel copper
B. nichrome
C. silicon carbide
D. silver - In direct arc furnace, which of the following has high value ?
A. Current
B. Voltage
C. Power factor
D. All of the above - In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity?
A. bad, good
B. bad, bad
C. good, bad
D. good, good - method has leading power factor____________?
A. Resistance heating
B. Dielectric heating
C. Arc heating
D. Induction heating - 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 above - A non-dimensional number generally associated with natural convection heat transfer is____________?
A. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt number - Due to which of the following reasons it is desirable to have short arc length ?
A. To achieve better heating
B. To increase the life of roof refractory
C. To have better stirring action
D. To reduce problem of oxidation
E. All of the above - Which of the following is an advantage of eddy current heating ?
A. The amount of heat generated can be controlled accurately
B. Heat at very high rate can be gene-rated
C. The area of the surface over which heat is produced can be accurately controlled
D. All of the above - 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 above
