Heat Transfer Basics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Transfer Basics, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Heat Transfer Basics MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Heat Transfer Basics mcq questions that explore various aspects of Heat Transfer Basics problems. Each MCQ is crafted to challenge your understanding of Heat Transfer Basics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Transfer Basics MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

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Heat Transfer Basics MCQs | Page 9 of 53

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Q81.
It is not preferable to use superheated steam in evaporators, because of its very

a.

high temperature

b.

high pressure

c.

low film co-efficient

d.

none of these

Discuss
Answer: (c).low film co-efficient
Q82.
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/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

a.

3.06 x 10⁵

b.

6.12 x 10⁵

c.

7.24 x 10⁵

d.

9.08 x 10⁵

Discuss
Answer: (a).3.06 x 10⁵
Q83.
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

a.

cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).

b.

outlent temperature of both the hot and cold fluid are same.

c.

outlet temperature of hot fluid is less than the outlet temperature of the cold fluid.

d.

none of these.

Discuss
Answer: (a).cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).
Q84.
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

a.

occupies smaller space.

b.

is more economical.

c.

is easy to operate and maintain.

d.

all (a), (b) and (c).

Discuss
Answer: (d).all (a), (b) and (c).
Q85.
Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because

a.

convection becomes important

b.

conduction becomes important

c.

radiation becomes important

d.

sub-cooled boiling occurs

Discuss
Answer: (c).radiation becomes important
Q86.
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow. )

a.

t

b.

1/ρ

c.

1/A

d.

all (a), (b) & (c)

Discuss
Answer: (d).all (a), (b) & (c)
Q87.
Temperature profile in steady state heat transfer is

a.

asymptotic

b.

hyperbolic

c.

parabolic

d.

linear

Discuss
Answer: (d).linear
Q88.
Which area is used in case of heat flow by conduction through a cylinder ?

a.

Logarithmic mean area

b.

Arithmetic mean area

c.

Geometric mean area

d.

None of these

Discuss
Answer: (a).Logarithmic mean area
Q89.
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

a.

between two bodies in physical contact with each other.

b.

between two bodies not in physical contact with each other.

c.

from one part of a body to the another part of the same body.

d.

both 'b' & 'c'

Discuss
Answer: (b).between two bodies not in physical contact with each other.
Q90.
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

a.

Nusselt number.

b.

Sherwood number.

c.

Schmidt number.

d.

Stanton number.

Discuss
Answer: (c).Schmidt number.
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