A. white body
B. grey body
C. black body
D. transparent body
Related Mcqs:
- A perfect black body is one that_____________?
A. transmits all incident radiations
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations - 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 heating - Radiations from a black body are proportional to____________?
A. T1
B. T2
C. T3
D. T* - The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?
A. ablation
B. radiation
C. viscous dissipation
D. irradiation - method has leading power factor____________?
A. Resistance heating
B. Dielectric heating
C. Arc heating
D. Induction heating - Which of the following has the highest value of thermal conductivity ?
A. Water
B. Steam
C. Sold ice
D. Melting ice - 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 - Which of the following will happen if the thickness of refractory wall of furnace is increased ?
A. Heat loss through furnace wall will increase
B. Temperature inside the furnace will fall
C. Temperature on the outer surface of furnace walls will drop
D. Energy consumption will increase - 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 - 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
