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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

Freon group of refrigerants are___________________?

A inflammable

C non-inflammable and toxic

D non-toxic and inflammable

Review Detailed Answer

Correct Answer: inflammable

The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?

A condensation of the refrigerant vapour

B evaporation of the refrigerant liquid

C compression of the refrigerant vapour

D metering of the refrigerant liquid

Review Detailed Answer

Correct Answer: evaporation of the refrigerant liquid

In a refrigeration cycle, the flow of refrigerant is controlled by___________________?

A compressor

B condenser

C evaporator

D expansion valve

Review Detailed Answer

Correct Answer: expansion valve

If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be_________________?

A 0.2

B 1.2

C 5

D 6

Review Detailed Answer

Correct Answer: 6

Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?

A compression

B direct

C indirect

D absorption

Review Detailed Answer

Correct Answer: absorption

Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

A 1.25

B 0.8

C 0.5

D 0.25

Review Detailed Answer

Correct Answer: 0.25

In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?

A condenser and expansion valve

B compressor and evaporator

C expansion valve and evaporator

D compressor and condenser

Review Detailed Answer

Correct Answer: expansion valve and evaporator

A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?

A 0.2

B 1.2

C 5

D 6

Review Detailed Answer

Correct Answer: 5

Accumulators should have adequate volume to store refrigerant charge at least_________________?

A 10%

B 25%

C 50%

D 75%

Review Detailed Answer

Correct Answer: 50%

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?

A collect liquid refrigerant and prevent it from going to compressor

B detect liquid in vapour

C superheat the vapour

D collect vapours

Review Detailed Answer

Correct Answer: collect liquid refrigerant and prevent it from going to compressor

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Freon group of refrigerants are___________________?

The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?

In a refrigeration cycle, the flow of refrigerant is controlled by___________________?

If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be_________________?

Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?

Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?

In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?

A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?

Accumulators should have adequate volume to store refrigerant charge at least_________________?

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?