Learn Heat Transfer MCQ Questions with answers and solutions.

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Q. All radiations in a black body are

(A) reflected
(B) refracted
(C) transmitted
(D) absorbed

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Q. Cork is a good insulator because it has

(A) free electrons
(B) atoms colliding frequency
(C) low density
(D) porous body

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Q. Depending on the radiating properties, a body will be black when

(A) p = 0, x = 0 and a = 1
(B) p= l,T = 0 and a = 0
(C) p = 0, x = 1 and a = 0
(D) x = 0, a + p = 0

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Q. Depending on the radiating properties, a body will be opaque when

(A) p = 0, x = 0 and a = 1
(B) p=l, x = 0 and a = 0
(C) p = 0, x = 1 and a = 0
(D) x – 0, a + p = 1

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Q. 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, N_c = 0.5 × 10^-3 kg/m².s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m²/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)

(A) 0.5
(B) 0.05
(C) 0.1
(D) 0.15

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Q. It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/(kgK). The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

(A) 3.06 × 10⁵
(B) 6.12 × 10⁵
(C) 7.24 × 10⁵
(D) 9.08 × 10⁵

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Q. Fqra cold viscous feed, backward feed gives __________ than forward feed.

(A) A higher capacity
(B) A lower capacity
(C) Lower economy
(D) None of these

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Q. In a multi-pass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.

(A) Twice
(B) Four times
(C) Square root of
(D) Square of

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Q. Terminal point temperature differences between fluids in case of a heat exchanger is termed as

(A) Approach
(B) Log mean temperature difference
(C) Arithmetic mean temperature difference
(D) Geometric mean temperature difference

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Q. In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is

(A) ∞
(B) 0
(C) Equal to the difference between hot and cold fluids inlet temperature
(D) Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature

Heat Transfer MCQs with answers Page - 2

Q. All radiations in a black body are

Q. Cork is a good insulator because it has

Q. Depending on the radiating properties, a body will be black when

Q. Depending on the radiating properties, a body will be opaque when

Q. Fqra cold viscous feed, backward feed gives __________ than forward feed.

Q. In a multi-pass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.

Q. Terminal point temperature differences between fluids in case of a heat exchanger is termed as

Q. In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is

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