Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. The compressor capacity is defined as the
(A) Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
(B) Volume of air delivered by the compressor
(C) Volume of air sucked by the compressor during its suction stroke
(D) None of the above
Answer: (B) Volume of air delivered by the compressor
Q2. An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes
(A) One adiabatic, two isobaric, and one constant volume
(B) Two adiabatic and two isobaric
(C) Two adiabatic, one isobaric and one constant volume
(D) One adiabatic, one isobaric and two constant volumes
Answer: (A) One adiabatic, two isobaric, and one constant volume
Q3. Ratio of indicated H.P. and brake H.P. is known as
(A) Mechanical efficiency
(B) Volumetric efficiency
(C) Isothermal efficiency
(D) Adiabatic efficiency
Answer: (A) Mechanical efficiency
Q4. Which of the following statement is correct as regard to centrifugal compressors?
(A) The flow of air is parallel to the axis of the compressor
(B) The static pressure of air in the impeller increases in order to provide centripetal force on the air
(C) The impeller rotates at high speeds
(D) The maximum efficiency is higher than multistage axial flow compressors
Answer: (B) The static pressure of air in the impeller increases in order to provide centripetal force on the air
Q5. Volumetric efficiency of air compressors is of the order of
(A) 20 – 30%
(B) 40 – 50%
(C) 60 – 70%
(D) 70 – 90%
Answer: (D) 70 – 90%
Q6. In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to
(A) N.T.P. conditions
(B) Intake temperature and pressure conditions
(C) 0°C and 1 kg/cm²
(D) 20°C and 1 kg/cm²
Answer: (B) Intake temperature and pressure conditions
Q7. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature
(A) 0.1%
(B) 0.5%
(C) 1%
(D) 5%
Answer: (C) 1%
Q8. The type of rotary compressor used in aeroplanes, is of
(A) Centrifugal type
(B) Axial flow type
(C) Radial flow type
(D) None of these
Answer: (B) Axial flow type
Q9. For maximum work, the reheating should be done to an intermediate pressure of
(Where p₁ = Maximum pressure, and p₂ = Minimum pressure)
(A) (p₁ – p₂)/2
(B) (p₁ + p₂)/2
(C) p₁/p₂
(D) p₁ p₂
Answer: (D) p₁ p₂
Q10. In the aircraft propellers
(A) The propulsive matter is caused to flow around the propelled body
(B) Propulsive matter is ejected from within the propelled body
(C) Its functioning does not depend on presence of air
(D) All of the above
Answer: (D) All of the above
Q11. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is
(A) Less
(B) More
(C) Same
(D) More/less depending on compressor capacity
Answer: (B) More
Q12. The thrust of a jet propulsion power unit can be increased by
(A) Injecting water into the compressor
(B) Burning fuel after gas turbine
(C) Injecting ammonia into the combustion chamber
(D) All of the above
Answer:(D) All of the above
Q13. The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
(A) Compressor efficiency
(B) Volumetric efficiency
(C) Isothermal efficiency
(D) Mechanical efficiency
Answer:(B) Volumetric efficiency
Q14. Isothermal compression efficiency can be attained by running the compressor
(A) At very high speed
(B) At very slow speed
(C) At average speed
(D) At zero speed
Answer: (B) At very slow speed
Q15. The velocity of air entering in a rocket is _ as compared to an aircraft.
(A) Zero
(B) Less
(C) More
(D) Same
Answer: (A) Zero
Q16. The blades of gas turbine are made of
(A) High nickel alloy
(B) Stainless steel
(C) Carbon steel
(D) High alloy steel
Answer: (A) High nickel alloy
Q17. The indicated work per unit mass of air delivered is
(A) Directly proportional to clearance volume
(B) Greatly affected by clearance volume
(C) Not affected by clearance volume
(D) Inversely proportional to clearance volume
Answer:(C) Not affected by clearance volume
Q18. Phenomenon of choking in compressor means
(A) No flow of air
(B) Fixed mass flow rate regardless of pressure ratio
(C) Reducing mass flow rate with increase in pressure ratio
(D) Increased inclination of chord with air steam
Answer: (B) Fixed mass flow rate regardless of pressure ratio
Q19. The pressure ratio of an ideal vaned compressor with increase in mass flow rate
(A) Increases
(B) Decreases
(C) Remain constant
(D) First decreases and then increases
Answer: (C) Remain constant
Q20. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into
(A) Atmosphere
(B) Vacuum
(C) Discharge nozzle
(D) Back to the compressor
Answer: (C) Discharge nozzle
We hope the given Mechanical Engineering MCQ Questions with Answers will definitely yield fruitful results. Hope you got enough ideas on the MCQs on Mechanical Engineering. If you have any queries related to Mechanical Engineering MCQs Multiple Choice Questions with Answers, drop your questions below and will get back to you in no time.
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 01
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 02
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 03
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 04
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 05
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 06
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 07
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 08
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 09
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 10
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 11
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 12
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 13
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 14
- Compressors, Gas Turbines and Jet Engines MCQ Practice Test – Set 15