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Chapter:

Principles of Evaporators, Condensers, Compressor and Expansion Devices Solved MCQs

in Refrigeration and Air conditioning

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

Chapters

Chapter: Principles of Evaporators, Condensers, Compressor and Expansion Devices
1.

Heat is absorbed by a refrigerant, during a refrigeration cycle in a

A. condenser
B. evaporator
C. compressor
D. throttle valve
Answer» B. evaporator
2.

What is the effect of frost on the cooling coils of the evaporator of refrigeration system

A. It reduces the life of cooling coils
B. It increases the compressor pressure
C. It makes the compressor run for comparatively short runs
D. It acts as the insulator and decreases the heat transfer rate
Answer» D. It acts as the insulator and decreases the heat transfer rate
3.

The widely used refrigerant in domestic refrigerators is

A. Carbon-dioxide
B. Sulphur dioxide
C. Freon-12
D. Ammonia
Answer» C. Freon-12
4.

Freon group refrigerants are

A. toxic
B. inflamma
C. nontoxic and inflammable
D. non- toxic & non-inflammable
Answer» D. non- toxic & non-inflammable
5.

Latent heat of vaporization of a refrigerant ,at lower temperatures and pressures

A. increase
B. decreases
C. remains constant
D. unpredictable
Answer» A. increase
6.

The refrigerant with highest critical pressure is

A. Carbon dioxide
B. Ammonia
C. Freon-11
D. Freon-22
Answer» B. Ammonia
7.

The Refrigerant commonly used in commercial ice plants is

A. Carbon-dioxide
B. Air
C. Ammonia
D. Freon-12
Answer» C. Ammonia
8.

Which of the following refrigerants has the lowest boiling point?

A. Freon-12
B. Carbon-dioxide
C. Ammonia
D. Sulphur dioxide
Answer» B. Carbon-dioxide
9.

In a flooded type of Evaporator which of the following types of expansion device is utilized

A. Float Valve
B. Thermostatic device
C. Capillary tube
D. Self actuated expansion valve
Answer» A. Float Valve
10.

Which of the following statements are TRUE?

A. A capillary tube is a variable opening area type expansion device
B. In a capillary tube pressure drop takes place due to fluid friction
C. In a capillary tube pressure drop takes place due to fluid acceleration
D. In a capillary tube pressure drop takes place due to fluid friction and acceleration
Answer» D. In a capillary tube pressure drop takes place due to fluid friction and acceleration

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