MCQsDrive | MCQsDrive

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.

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?

A strong solution to weak solution

B weak solution to strong solution

C strong solution to ammonia vapour

D ammonia vapour to weak solution

Review Detailed Answer

Correct Answer: weak solution to strong solution

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

A same

B more

C less

D more/less depending on rating

Review Detailed Answer

Correct Answer: more

Highest pressure encountered in a refrigeration system should be________________?

A critical pressure of refrigerant

B much below critical pressure

C much above critical pressure

D near critical pressure

Review Detailed Answer

Correct Answer: much below critical pressure

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

A Ammonia

B Carbon dioxide

C Freon

D Brine

Review Detailed Answer

Correct Answer: Carbon dioxide

Where does the lowest temperature occur in a vapour compression cycle ?

A condenser

B evaporator

C compressor

D expansion valve

Review Detailed Answer

Correct Answer: evaporator

Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?

A 1 : 1

B 1 : 9

C 9 : 1

D 1 : 3

Review Detailed Answer

Correct Answer: 1 : 9

Ammonia is __________________?

A non-toxic

B non-inflammable

C toxic and non-inflammable

D highly toxic and inflammable

Review Detailed Answer

Correct Answer: highly toxic and inflammable

Short horizontal lines on pressure-enthalpy chart show__________________?

A constant pressure lines

B constant temperature lines

C constant total heat lines

D constant entropy lines

Review Detailed Answer

Correct Answer: constant pressure lines

One ton of the refrigeration is_________________?

A the standard unit used in refrigeration problems

B the cooling effect produced by melting 1 ton of ice

C the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

D the refrigeration effect to produce 1 ton of ice at NTP conditions

Review Detailed Answer

Correct Answer: the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?

A bigger cabinet should be used

B smaller cabinet should be used

C perfectly tight vapour seal should be used

D refrigerant with lower evaporation temperature should be used

Review Detailed Answer

Correct Answer: perfectly tight vapour seal should be used

Showing 11 to 20 of 84 results

Contact Info

Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

Highest pressure encountered in a refrigeration system should be________________?

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?

Where does the lowest temperature occur in a vapour compression cycle ?

Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?

Ammonia is __________________?

Short horizontal lines on pressure-enthalpy chart show__________________?

One ton of the refrigeration is_________________?

For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?