21. Temperature of steam at around 540°C canbe measured by
(a) thermometer
(b) radiatiouv pyrometer
(c) thermistor
(d) thermocouple
(e) thermopile.
Ans: d
22. 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.
Ans: b
23. The time constant of a thermocouple is
(a) the time taken to attain the final temperature to be measured
(b) the time taken to attain 50% of the value of initial temperature difference
(c) the time taken to attain 63.2% of the value of initial temperature difference
(d) determined by the time taken to reach 100°C from 0°C
(e) none of the above.
Ans: c
24. 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.
Ans: a
25. Heat flows from one body to other when they have
(a) different heat contents
(b) different specific heat
(c) different atomic structure
(d) different temperatures
(e) none of the above.
Ans: d
26. The concept of overall coefficient of heat transfer is used in heat transfer problems of
(a) conduction
(b) convection
(c) radiation
(d) all the three combined
(e) conduction and comte_ction.
Ans: e
27. In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by
(a) hr (time)
(b) sqm (area)
(c) °C (temperature)
(d) cm (thickness)
(e) kcal (heat).
Ans: d
28. The amount of heat flow through a body by conduction is
(a) directly proportional to the surface area of the body
(b) directly proportional to the temperature difference on the two faces of the body
(c) dependent upon the material of the body
(d) inversely proportional to the thickness of the body
(e) all of the above.
Ans: e
29. Which of the following has least value of conductivity
(a) glass
(b) water
(c) plastic
(d) rubber
(e) air.
Ans: e
30. Which of the following is expected to have highest thermal conductivity
(a) steam
(b) solid ice
(c) melting ice
(d) water
(e) boiling water.
Ans: b
Read More Questions:
Heat Transfer - Mechanical MCQs Part1
Heat Transfer - Mechanical MCQs Part2
(a) thermometer
(b) radiatiouv pyrometer
(c) thermistor
(d) thermocouple
(e) thermopile.
Ans: d
22. 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.
Ans: b
23. The time constant of a thermocouple is
(a) the time taken to attain the final temperature to be measured
(b) the time taken to attain 50% of the value of initial temperature difference
(c) the time taken to attain 63.2% of the value of initial temperature difference
(d) determined by the time taken to reach 100°C from 0°C
(e) none of the above.
Ans: c
24. 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.
Ans: a
25. Heat flows from one body to other when they have
(a) different heat contents
(b) different specific heat
(c) different atomic structure
(d) different temperatures
(e) none of the above.
Ans: d
26. The concept of overall coefficient of heat transfer is used in heat transfer problems of
(a) conduction
(b) convection
(c) radiation
(d) all the three combined
(e) conduction and comte_ction.
Ans: e
27. In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by
(a) hr (time)
(b) sqm (area)
(c) °C (temperature)
(d) cm (thickness)
(e) kcal (heat).
Ans: d
28. The amount of heat flow through a body by conduction is
(a) directly proportional to the surface area of the body
(b) directly proportional to the temperature difference on the two faces of the body
(c) dependent upon the material of the body
(d) inversely proportional to the thickness of the body
(e) all of the above.
Ans: e
29. Which of the following has least value of conductivity
(a) glass
(b) water
(c) plastic
(d) rubber
(e) air.
Ans: e
30. Which of the following is expected to have highest thermal conductivity
(a) steam
(b) solid ice
(c) melting ice
(d) water
(e) boiling water.
Ans: b
Read More Questions:
Heat Transfer - Mechanical MCQs Part1
Heat Transfer - Mechanical MCQs Part2
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