Hot coffee in a cup is allowed to cool. Its cooling rate is measured and found to be greater than the value calculated by conduction, convection and radiation measurement. The difference is due to:

Properties of coffee changing with temperature

Currents of air flow in the room

Underestimation of the emissivity of coffee

Which of the following parameter is not responsible for loss of heat from a hot surface in room?

Temperature of the air in the room

Explore topic-wise MCQs in Thermal Engineering.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.	Hot coffee in a cup is allowed to cool. Its cooling rate is measured and found to be greater than the value calculated by conduction, convection and radiation measurement. The difference is due to:
A.	Properties of coffee changing with temperature
B.	Currents of air flow in the room
C.	Underestimation of the emissivity of coffee
D.	Evaporation
Answer» E.

Discussion

2.	Which of the following parameter is not responsible for loss of heat from a hot surface in room?
A.	Temperature of the surface
B.	Emissivity of the surface
C.	Temperature of the air in the room
D.	Dimensions of the room
Answer» E.

Discussion

3.	If a body is at 2000K, the wavelength at which the body emits maximum amount of radiation is __________
A.	1.45 m
B.	1.45cm
C.	0.345cm
D.	0.345 m
Answer» B. 1.45cm

Discussion

Explore topic-wise MCQs in Thermal Engineering.

Hot coffee in a cup is allowed to cool. Its cooling rate is measured and found to be greater than the value calculated by conduction, convection and radiation measurement. The difference is due to:

Which of the following parameter is not responsible for loss of heat from a hot surface in room?

If a body is at 2000K, the wavelength at which the body emits maximum amount of radiation is __________