Refrigeration And Air Conditioning MCQ Questions & Answers

Refrigeration And Air Conditioning MCQ Questions & Answers | Mechanical Engineering

Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-10 section-1

The bank of tubes at the back of domestic refrigerator is

A) Condenser tubes B) Evaporator tubes C) Refrigerant cooling tubes D) Capillary tubes

Discuss

Answer & Solution

Answer: Option A

Solution:

The bank of tubes at the back of domestic refrigerator is Condenser tubes

The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

A) Same B) Lower C) Higher D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

The C.O.P. of a Carnot refrigerator in winter will be Higher as compared to C.O.P. in summer.

Carbon dioxide is

A) Colourless B) Odourless C) Non-flammable D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

Carbon dioxide is
- Colourless
- Odourless
- Non-flammable

On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

A) Involves no change in volume B) Takes place at constant temperature C) Takes place at constant entropy D) Takes place at constant pressure

Discuss

Answer & Solution

Answer: Option D

Solution:

On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process Takes place at constant pressure

The humidification process, on the psychrometric chart is shown by

A) Horizontal line B) Vertical line C) Inclined line D) Curved line

Discuss

Answer & Solution

Answer: Option B

Solution:

The humidification process, on the psychrometric chart is shown by Vertical line

For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

A) Small B) High C) Equal D) Anything

Discuss

Answer & Solution

Answer: Option A

Solution:

For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be Small

Choose the correct statement

A) A refrigerant should have low latent heat B) If operating temperature of system is low, then refrigerant with low boiling point should be used C) Pre-cooling and sub-cooling bf refrigerant are same D) Superheat and sensible heat of a refrigerant are same

Discuss

Answer & Solution

Answer: Option B

Solution:

If operating temperature of system is low, then refrigerant with low boiling point should be used

The C.O.P. of a heat pump working on a reversed Carnot cycle is

A) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2} - {{\text{T}}_1}}}$$ B) $$\frac{{{{\text{T}}_2} - {{\text{T}}_1}}}{{{{\text{T}}_1}}}$$ C) $$\frac{{{{\text{T}}_1} - {{\text{T}}_2}}}{{{{\text{T}}_1}}}$$ D) $$\frac{{{{\text{T}}_2}}}{{{{\text{T}}_2} - {{\text{T}}_1}}}$$

Discuss

Answer & Solution

Answer: Option D

Solution:

The C.O.P. of a heat pump working on a reversed Carnot cycle is $$\frac{{{{\text{T}}_2}}}{{{{\text{T}}_2} - {{\text{T}}_1}}}$$

Critical pressure of a liquid is the pressure

A) Above which liquid will remain liquid B) Above which liquid becomes gas C) Above which liquid becomes vapour D) Above which liquid becomes solid

Discuss

Answer & Solution

Answer: Option A

Solution:

Critical pressure is the pressure required to liquify a gas at or below its critical temperature.
Critical pressure of a liquid is the pressure, above which liquid will remain liquid.

100

In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

A) Wet vapour region B) Superheated vapour region C) Sub-cooled liquid region D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

In a pressure enthalpy chart, the space to the left of the saturated liquid line represents Sub-cooled liquid region