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.

The material commonly used for air craft gas turbine is__________________?

A stainless steel

B high alloy’ steel

C duralumin

D Timken, Haste and Inconel allpys

Review Detailed Answer

Correct Answer: Timken, Haste and Inconel allpys

The ideal efficiency of simple gas turbine cycle depends on________________?

A pressure ratio

B maximum cycle temperature

C minimum cycle temperature

D all of the above

Review Detailed Answer

Correct Answer: pressure ratio

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

A remain same

B decrease

C increase

D unpredictable

Review Detailed Answer

Correct Answer: increase

Water gas is produced by ___________________ ?

A carbonisation of coal

B passing steam over incandescent coke

C passing air and a large amount of steam over waste coal at about 65°C

D partial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast

Review Detailed Answer

Correct Answer: passing steam over incandescent coke

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

A increases

B decreases

C first increases and then decreases

D first decreases and then increases

Review Detailed Answer

Correct Answer: increases

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?

A heated

B compressed air before entering the combustion chamber is heated

C bled gas from turbine is heated and readmitted for complete expansion

D exhaust gases drive the compressor

Review Detailed Answer

Correct Answer: heated

Efficiency of gas turbine is increased by________________ ?

A reheating

B inter cooling

C adding a regenerator

D all of the above

Review Detailed Answer

Correct Answer: adding a regenerator

The hottest point in a gas turbine is______________________?

A at the base

B at the tip

C in the center

D between ~ to i of the blade height

Review Detailed Answer

Correct Answer: between ~ to i of the blade height

Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?

A higher

B lower

C equal

D can’t be compared

Review Detailed Answer

Correct Answer: lower

The pressure ratio in gas turbines is of the order of__________________?

A 2:l

C 61: 1

D 9 : 1

Review Detailed Answer

Correct Answer: 61: 1

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The material commonly used for air craft gas turbine is__________________?

The ideal efficiency of simple gas turbine cycle depends on________________?

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

Water gas is produced by ___________________ ?

The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?

Efficiency of gas turbine is increased by________________ ?

The hottest point in a gas turbine is______________________?

Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?

The pressure ratio in gas turbines is of the order of__________________?