A. exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
B. exhaust valve opens at bottom ‘dead center and closes at top dead center
C. exhaust valve opens just after bottom dead center and closes just before top dead center
D. may open and close anywhere
E. none of the above is true
Mechanical Engineering Mcqs
Mechanical Engineering Mcqs for Preparation of Job Test and interview, freshers, Students, competitive exams etc. Multiple choice questions here are on topics such as Machine Design, Theory of Machines, Hydraulic Machines etc.
| MECHANICAL ENGINEERING MCQS | |||
|---|---|---|---|
| 1. | Engineering Materials | 2. | Engineering Mechanics |
| 3. | Fluid Mechanics | 4. | Heat Transfer |
| 5. | Hydraulic Machines | 6. | I.C. Engines |
| 7. | Machine Design | 8. | Nuclear Power Plants |
| 9. | Production Technology | 10. | Workshop Technology |
| 11. | Refrigeration and Air Conditioning | 12. | Steam Boilers, Engines, Nozzles and Turbines |
| 13. | Compressors, Gas Turbines and Jet Engines | 14. | Strength of Materials |
| 15. | Theory of Machines | 16. | Thermodynamics |
A. diesel engines
B. gas turbines
C. petrol engines
D. aircraft engines
E. marine engines
A. increase efficiency
B. increase power
C. reduce weight and bulk for a given out-put
D. effect fuel economy
E. none of the above
A. equal to stroke volume
B. equal to stroke volume and clearance volume
C. less than stroke volume
D. more than stroke volume
E. more than cylinder volume
A. higher
B. lower
C. remain unaffected
D. unpredictable
E. none of the above
Which of the following is false statement?
A. piston ring and cylinder wear
B. formation of hard coating on piston skirts
C. oil sludge in the engine crank case
D. detonation
E. forms corrosive acids
A. more
B. less
C. same
D. more/less depending on capacity of engine
E. varies from design to design
A. same
B. more
C. less
D. less or more depending on operating conditions
E. unpredictable
A. is lighter
B. wears less
C. absorbs shocks
D. is stronger
E. does not react with fuel and lub oil
A. same
B. less
C. more
D. variable
E. more/less depending on engine capacity.
