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.

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

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

A high, of the order of 25°

B as low as possible (3 to 11°C)

C zero

D any value

Review Detailed Answer

Correct Answer: as low as possible (3 to 11°C)

Condensing temperature in a refrigerator is the temperature_________________?

A of cooling medium

B of freezing zone

C of evaporator

D at which refrigerant gas becomes liquid

Review Detailed Answer

Correct Answer: at which refrigerant gas becomes liquid

The value of COP in vapour compression cycle is usually__________________?

A always less than unity

B always more than unity

C equal to unity

D any one of the above

Review Detailed Answer

Correct Answer: always more than unity

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

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___________________?

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

Condensing temperature in a refrigerator is the temperature_________________?

The value of COP in vapour compression cycle is usually__________________?