mechanical engineering MCQs – Page 76

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

1501. TMU in method time measurement stands for__________________?
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A. time measurement unit

B. time method unit

C. time movement unit

D. technique measurement unit

E. time motion unit

1502. Queuing theory deals with problems of________________?
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A. better utilization of man services

B. effective use of machines

C. none of the above.

D. reducing the waiting time or idle Jajme

E. material handling

1503. For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?
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A. about 1.7 times

B. about 0.5 times

C. about 5 times

D. about twice

E. nearly equal

1504. Graphical method, simplex method, and transportation method are concerned with__________________?
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A. queing theory

B. linear programming

C. break-even analysis

D. value analysis

E. tnaterial handling

1505. Pick up the wrong statement?
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A. petrol engines work on otto cycle

B. thermal efficiency of 4-stroke engine is more due to positive scavenging

C. petrol engines occupy more space than diesel engines for same power output

D. 2-stroke engine can run in any direction

E. In 4-stroke engine, a power stroke is obtained in 4-strokes

1506. The specific gravity of diesel oil Is_________________?
0

A. 0.5

B. 1

C. 1.25

D. 0.7

E. 0.85

1507. High carbon content in diesel oil used for diesel engine leads to_________________?
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A. production of highly corrosive gases corroding the cylinder walls and exhaust system

B. excessive engine wear

C. damaging of both the storage tank and the engine

D. deposition on engine parts

E. none of the above.

1508. The main disadvantage of line organisation is_________________?
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A. communication delays occur

B. top level executives have to do excessive work

C. none of the above

D. structure is rigid

E. all of the above

1509. A 4-stroke diesel engine needs about following amount of air_________________?
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A. 7500 cc per min. per h.p.

B. 75 cc per min. per h.p.

C. 75000 cc per min. per h.p.

D. 750 cc per min. per h.p.

E. 750000 cc per min. per h.p

1510. The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?
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A. more

B. same

C. it may be less or more depending on several other factors

D. less

E. more upto some load and then less

1511. According to Recardos theory, detonation occurs due to______________________?
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A. improper combustion

B. self ignition temperature has nothing to do with detonation

C. instantaneous auto-ignition of last part of charge to be burnt

D. improper mixing of air and fuel

E. none of the above

1512. Queuing theory is associated with __________________?
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A. waiting time

B. production time

C. inspection time

D. sales

E. inventory

1513. The time by which the activity completion time can be delayed without affecting the start of succeeding activities, is Known as_________________?
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A. duration

B. interfering float

C. total float

D. free float

E. none of the above

1514. Routing is essential in the following type of industry_________________?
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A. assembly industry

B. steel industry

C. mass production industry

D. process industry

E. job order industry

1515. In steel plant the most important system for materials handling is_____________________?
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A. locos

B. trucks

C. none of the above

D. cranes and hoists

E. conveyors

1516. CPM has following time estimate__________________
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A. one time estimate

B. three time estimate

C. two time estimate

D. four time estimate

E. nil time estimate

1517. Pick up the correct step used for scheduling a project by C.P.M.__________________?
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A. sequence of various activities is made according to their importance

B. required time for each activity is established

C. all of the above

D. network is drawn by connecting the activities and the events

E. a project is divided into various activities

1518. Pick up the incorrect statement from the following?
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A. each activity consumes a given time

B. an activity of the project is denoted by an arrow on the net work

C. the arrows are drawn (to scale from) left to right

D. the tail of the arrow indicates the start of the activity

E. the head of the arrow indicates the end of,the activity!

1519. The termal efficiency of a petrol engine at design load is around_________________?
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A. 30%

B. 15%.

C. 40%

D. 90%

E. 50%

1520. Slack of various events on the critical path in PERT/CPM chart___________________?
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A. increases continuously

B. remains constant

C. decreases continuously

D. unpredictable

E. may increase or decrease depending on various factors

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