Refrigerants - 1


10 Questions MCQ Test Mock Test Series - Mechanical Engineering (ME) for GATE 2020 | Refrigerants - 1


Description
This mock test of Refrigerants - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 10 Multiple Choice Questions for Mechanical Engineering Refrigerants - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Refrigerants - 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Refrigerants - 1 exercise for a better result in the exam. You can find other Refrigerants - 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

Which among the following is undesirable property of a good refrigerant?

Solution:
QUESTION: 2

Which of the following is not true in respect of an ideal refrigerant?

Solution:

Desirable properties of an ideal refrigerant:
-Low boiling point
- High critical temperature
- High latent heat of vaporization
- Low specific heat of liquid
- Low specific volume of vapour
- Non-corrosive to metal
- Non-flammable and non-explosive
- Non-toxic
- Low cost
- Easy to liquify at moderate pressure and temperature
- Easy of locating leaks by odour or suitable indicator
- Mixes well with oil

QUESTION: 3

Match List-I (Characteristics) with
List- ll
(Refrigerant) the following:
List-I
A. Lowest boiling point
B. Highly toxic and flammable
C. Highest freezing point
D. Highest critical
List-ll
1. R-502
2. Carbon dioxide
3. Ammonia
4. R-22 pressure
CODE

Solution:
QUESTION: 4

R-12 is generally preferred over R-22 in deep freezers since

Solution:
QUESTION: 5

Environmental protection agencies advice against the use of chlorofluoro-carbon refrigerants because

Solution:


A single atom of Cl released from CFC reacts taking out 105 O3 molecules.

QUESTION: 6

The selection of refrigerant for a vapour compression system depends on
1. Toxicity
2. Environmental effect
3. Saturation pressure-temperature relationship

Q. Which of these statements are correct?

Solution:
QUESTION: 7

Match the List-I (Refrigerants) with List-II (Application) following
:

Solution:

Ammonia (NH)3
Reciprocating & screw compressors Cold storages ice plants, Food refrigeration
Water (H20)
Water-lithium bromide Steam ejector system only for air-conditioning
R-12
Reciprocating compressors in small unit Domestic refrigerators, water coolers
CO2
Frozen-food transport refrigeration
R-11
Used with centrifugal compressors in large capacity central air-conditioning plants.

QUESTION: 8

When there is leakage of ammonia refrigerant, the sulphur stick gives

Solution:

For ammonia leaks, a burning sulphur taper is used which in presence of ammonia forms white fumes of ammonia sulphate

QUESTION: 9

Which of the following leak-detection method is extensively used in the manufacture and assembly of refrigerant equipment?

Solution:

An electronic leak detector is most sensitive and is used in the manufacturing and assembly of refrigerant equipment. The operation of the instrument depends on the flow of current due to the ionization of the leakage gas between two opposite-charged platinum electrode.

QUESTION: 10

The leaks in a refrigeration system using Freon are detected by

Solution: