Ashok Leyland Placement Paper

ASHOK LEYLAND - Mechanical Engineering Sample Questions With Answers

1. In a four stage compressor, if the pressure at the first and third stage are 1 bar and 16 bar, then the delivery pressure at the fourth stage will be
A. 1 bar
B. 16 bar
C. 64 bar
D. 256 bar

2. The compressed air may be used
A. in gas turbine plants
B. for operating pneumatic drills
C. in starting and supercharging of I.C. engines
D. all of the above

3. A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
A. equal to
B. one-half
C. double

4. The volumetric efficiency for reciprocating air compressors is about
A. 10 to 40%
B. 40 to 60%
C. 60 to 70%
D. 70 to 90%

5. The maximum temperature in a gas turbine is
A. 200°C 
B. 500°C
C. 700°C 
D. 1000°C

6. The stagnation pressure rise in a centrifugal compressor takes place
A. in the diffuser only
B. in the impeller only
C. in the diffuser and impeller
D. in the inlet guide vanes only

7. In a jet propulsion
A. the propulsive matter is ejected from within the propelled body
B. the propulsive matter is caused to flow around the propelled body
C. its functioning does not depend upon presence of air
D. none of the above

8. Which of the following statement is wrong?
A. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
B. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
C. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
D. none of the above

9. In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.
A. one stroke
B. two strokes
C. three strokes
D. four strokes

10. The maximum delivery pressure in a rotary air compressor is
A. 10 bar
B. 20 bar
C. 30 bar
D. 50 bar

11. Intercooling in multi-stage compressors is done
A. to cool the air during compression
B. to cool the air at delivery
C. to enable compression in two stages
D. to minimise the work of compression

12. The ratio of workdone per cycle to the stroke volume of the compressor is known as
A.compressor capacity
B. compression ratio
C. compressor efficiency
D. mean effective pressure

13. In the aircraft propellers
A. the propulsive matter is ejected from within the propelled body
B. the propulsive matter is caused to flow around the propelled body
C. its functioning does not depend upon the presence of air
D. none of the above

14. The type of rotary compressor used in gas turbines, is of
A. centrifugal type
B. axial flow type
C. radial flow type
D. none of these

15. The volume of air delivered by the compressor is called
A. free air delivery
B. compressor capacity
C. swept volume
D. none of these

16.The efficiency of a jet engine is higher at
A. low speeds
B. high speeds
C. low altitudes
D. high altitudes