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# Test: Refrigerant Compressors - 1

## 20 Questions MCQ Test RRB JE for Mechanical Engineering | Test: Refrigerant Compressors - 1

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This mock test of Test: Refrigerant Compressors - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 20 Multiple Choice Questions for Mechanical Engineering Test: Refrigerant Compressors - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Refrigerant Compressors - 1 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Refrigerant Compressors - 1 exercise for a better result in the exam. You can find other Test: Refrigerant Compressors - 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

### A single-acting two-stage compressor with complete inter cooling delivers air at 16 bar. Assuming an intake state of 1 bar at 15°C, the pressure ratio per stage is:

Solution:

Pressure ratio of each stage must be same

QUESTION: 2

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QUESTION: 3

### Which of the following statements does NOT apply to the volumetric efficiency of a reciprocating air compressor?

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QUESTION: 4

Air     enters a compressor at a temperature of 27°C. The compressor pressure ratio is 4. Assuming an efficiency of 80%, the compressor work required in kJ/kg is:

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QUESTION: 5

Select statements from List-II matching the processes in List-I. Enter your answer as A, B if the correct choice for (1) is (A) and that for (2) is (B)

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QUESTION: 6

A centrifugal compressor is suitable for which of the following?

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QUESTION: 7

Which type of valves is generally used in reciprocating refrigerant compressors?

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QUESTION: 8

In a single stage reciprocating air compressor, the work done on air to compress it from suction pressure to delivery pressure will be minimum when the compression is

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QUESTION: 9

The capacity of an air compressor is specified as 3 m3/min. It means that the compressor is capable of:

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QUESTION: 10

When a burnt out hermetic compressor is replaced by a new one, it is desirable to include in the system a large drier-cum ·strainer also. This is to be placed in

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QUESTION: 11

Match List-I (Name of equipment) with List-II (Pressure ratio) and select the correct answer using the code given below the lists:

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QUESTION: 12

Which one of the following statements is correct?

In reciprocating compressors, one should aim at compressing the air

Solution:
QUESTION: 13

Roots blower is an example of:

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QUESTION: 14

Assertion (A): A reciprocating air compressor at sea level would deliver a greater mass of air than a compressor on a mountain.

Reason (R): The compressor ratings are given for “free air”.

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QUESTION: 15

Assertion (A): In multi-stage compressors, the polytropic efficiency is always greater than the isentropic efficiency.

Reason(R): Higher the pressure ration, the greater is the polytropic efficiency.

Solution:
QUESTION: 16

During steady flow compression process of a gas with mass flow rate of 2 kg/s. increase in specific enthalpy is 15kJ/kg and decrease in kinetic energy is 2 kJ/kg. The rate of heat rejection to the environment is 3kW. The power needed to drive the compressor is:

Solution:

Power needed to drive the compression

QUESTION: 17

When are shock waves formed in air compressors?

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QUESTION: 18

For a two-stage reciprocating air compressor, the suction pressure is 1.5 bar and the delivery pressure is 54 bar. What is the value of the ideal intercooler pressure?

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QUESTION: 19

What is the preferred intercooler pressure for a two stage air compressor working between the suction pressure ps and the delivery pressure pd?

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QUESTION: 20

Reciprocating compressors are provided with

Solution: