Heat Transfer - Section 1 (5)

Directions to Solve

Heat Transfer - Section 1

In this section of Heat Transfer, you will find the MCQs related to this field
and can submit your answers easily.

33.

The steam ejector is used to

A.	remove condensate from the steam pipelines.
B.	create vacuum.
C.	superheat the steam.
D.	none of these.

Answer: Option B

Explanation:

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34.

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

A.	increases
B.	decreases
C.	is not affected
D.	may increase or decrease; depends on the feed

Answer: Option B

Explanation:

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35.

Fouling factor

A.	is a dimensionless quantity.
B.	does not provide a safety factor for design.
C.	accounts for additional resistances to heat flow.
D.	none of these.

Answer: Option C

Explanation:

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36.

In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is

A.	40.5
B.	34.4
C.	26.8
D.	25

Answer: Option B

Explanation:

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37.

For an ideal black body

A.	absorptivity = 1
B.	reflectivity = 1
C.	emissivity = 0
D.	transmissivity = 1

Answer: Option A

Explanation:

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38.

With increase in porosity, the thermal conductivity of a solid substance

A.	increases
B.	decreases
C.	remains unchanged
D.	may increase or decrease; depends on the solid

Answer: Option B

Explanation:

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39.

In the equation Q = UAΔt; Δt is

A.	geometric mean temperature difference.
B.	arithmetic mean temperature difference.
C.	logarithmic mean temperature difference.
D.	the difference of average bulk temperatures of hot and cold fluids.

Answer: Option C

Explanation:

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40.

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

A.	baffle spacing & shell diameter.
B.	tube diameter & pitch.
C.	viscosity, density & mass velocity of shell side fluid.
D.	none of these.

Answer: Option D

Explanation:

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