# Compressors, Gas Turbines and Jet Engines Objective Questions with Answers – Set 18

Its our pleasure to assist you towards your goal. for inbuilt quality question with standard solution may help you a lot. you guys are looking for Mechanical engineering MCQ question with answers PDF free download as per Mechanical engineering new exam pattern? you come for the right page. Each question has four option followed by the right answer. these Mechanical MCQ question and solution may help you to get better performance in exam .

## Q1. A rocket engine uses __ for the combustion of its fuel.

(A) Surrounding air
(B) Compressed atmospheric air
(C) Its own oxygen
(D) None of these

(A) 1 : 1.2
(B) 1 : 2
(C) 1 : 5
(D) 1 : 10

## Q3. 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

## Q4. The pressure and temperature conditions of air at the suction of compressor are

(A) Atmospheric
(B) Slightly more than atmospheric
(C) Slightly less than atmospheric
(D) Pressure slightly less than atmospheric and temperature slightly more than atmospheric

(A) These are used to dampen pulsations
(B) These act as reservoir to take care of sudden demands
(C) These increase compressor efficiency
(D) These knock out some oil and moisture

## Q6. Volumetric efficiency of a compressor decreases with __ in compression ratio.

(A) Decrease
(B) Increase
(C) Remain same
(D) Does not change

## Q7. 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

## Q8. Pick up the false statement

(A) Gas turbine is a self starting unit
(B) Gas turbine does not require huge quantity of water like steam plant
(C) Exhaust losses in gas turbine are high due to large mass flow rate
(D) Overall efficiency of gas turbine plant is lower than that of a reciprocating engine

(A) 1 to 5 bar
(B) 5 to 8 bar
(C) 8 to 10 bar
(D) 10 to 15 bar

(A) 6 kg/cm²
(B) 10 kg/cm²
(C) 16 kg/cm²
(D) 25 kg/cm²

## Q11. The pressure of air at the beginning of the compression stroke is __ the atmospheric pressure.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

## Q12. Pressure ratio in gas turbines is the ratio of

(A) Compressor pressure ratio
(B) Highest pressure to exhaust pressure
(C) Inlet pressure to exhaust pressure
(D) Pressures across the turbine

## Q13. Euler’s equation is applicable for

(A) Centrifugal compressor
(B) Axial compressor
(C) Pumps
(D) All of the above

(A) W₁/(W₁ + W₂)
(B) W₂/(W₁ + W₂)
(C) (W₁ + W₂)/W₁
(D) (W₁ + W₂)/W₂

## Q15. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

(A) Increases
(B) Decreases
(C) Remain same
(D) First increases and then decreases

We have qualities knowledge to ensure that this question with solution will definitely help you to achieve perfect score. If you have any MCQ question regarding Mechanical engineering . then drop your questions below and will get back to you in no time.