371. Heat flowing from one side to other depends directly on ___________________?
Pick up the wrong case?
A. face area
B. time
C. thickness
D. temperature difference
E. thermal conductivity

372. Which of the following is the case of heat transfer by radiation ___________________?
A. blast furnace
B. heating of building
C. cooling of parts in furnace
D. heat received by a person from fireplace
E. all of the above

373. Which of the following is a case of steady state heat transfer ___________________?
A. I.C. engine
B. air preheaters
C. heating of building in winter
D. all of the above
E. none of the above

374. Thermal conductivity of water in general with rise in temperature ____________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above

375. Temperature of steam at around 540°C can be measured by ____________________?
A. thermometer
B. radiative pyrometer
C. thermistor
D. thermocouple
E. thermopile

376. Metals are good conductors of heat because________________?
A. their atoms collide frequently
B. their atoms-are relatively far apart
C. they contain free electrons
D. they have high density
E. all of the above

377. Cork is a good insulator because it has___________________?
A. free electrons
B. atoms colliding frequency
C. low density
D. porous body
E. all of the above

378. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?
A. 0.002
B. 0.02
C. 0.01
D. 0.1
E. 0.5

379. Thermal conductivity of air with rise in temperature__________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above

380. Total heat is the heat required to__________________?
A. change vapour into liquid
B. change liquid into vapour
C. increase the temperature of a liquid or vapour
D. convert water into steam and superheat it
E. convert saturated steam into dry steam

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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