mechanical engineering MCQs – Page 78

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 Review each marked answer and report any item that may be outdated or unclear.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

1541. String diagram is used when__________________?
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A. idle time is to be reduced

B. team of workers is working at a place

C. all of the above

D. none of the above

E. material handling is to be done

1542. Cetane___________________?
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A. has zero cetane number

B. is a straight chain paraffin

C. determines the efficiency of an I.C. engine

D. helps detonation

E. has 100 cetane number

1543. The function of a fuel pump in a petrol pump is to______________________?
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A. pump fuel so that it reaches carburettor (to improve thermal efficiency)

B. supply fuel when carburettor fails

C. inject fuel in cylinder

D. does not exist

1544. The technique of value analysis can be applied to____________________?
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A. complicated items only

B. any item

C. simple items only

D. crash programmer items only

E. cost consciousness items only

1545. Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?
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A. heavy supercharging

B. heavy turbulence

C. detonation

D. improved scavenging

E. preignition

1546. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?
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A. higher

B. lower

C. unpredictable.

D. same

E. depends on size of engine

1547. Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?
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A. mixture of cetane and alphamethyl napthalene

B. mixture of aldehydes and ketones

C. ethylene dibromide

D. cetane

E. mixture of cetane with tetra-ethyl lead

1548. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?
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A. 25:5:10:60

B. 25:35:5:35

C. 5:25:30:50

D. 25:5:35:35

E. 40:30:15:15

1549. Pick up the false statement ?
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A. Theoretically correct mixture of air am petrol is approximately 15 : 1

B. High speed compression engines operate on dual combustion cycle

C. Diesel engines are compression ignition engines

D. S.I. engines are quality-governed engines

E. Thermal efficiency of diesel engine i about 34%

1550. CPMis___________________?
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A. is built of activities oriented program-mes

B. is, based on one time eytimate

C. all of the above

D. is used for repetitive works

E. synthesising in concepts

1551. The theoretically correct mixture of air and petrol is approximately ________________?
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A. 0.334027778

B. 0.500694444

C. 0.834027778

D. 0.625694444

1552. Which of the following layouts is suited for mass production_________________?
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A. product layout

B. functional layout

C. process layout

D. plant layout

E. fixed position layout

1553. The pour point of diesel oil must be_________________?
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A. lower than the coldest atmospheric temperature at which oil is to be pumped

B. more than 100C

C. has no such relation

D. higher than above

E. none of the above

1554. According to MAPI formula, the old machine should be replaced by new one when_____________?
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A. CAM > DAM

B. there is no such criterion

C. CAM = DAM

D. CAM < DAM

E. none of the above

1555. What does symbol O imply in work study________________?
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A. delay/temporary storage

B. none of the above

C. inspection

D. operation

E. transport

1556. PERT is the__________________?
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A. event oriented technique

B. target oriented technique

C. work oriented technique

D. time oriented technique

E. activity oriented technique

1557. Hot air standard diesel cycle efficiency with increase in value of C_______________?
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A. remains unaffected

B. decreases

C. increases

D. depends on other factors

E. unpredictable

1558. The self-ignition temperature of diesel oil compared to petrol is_________________?
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A. unpredictable

B. higher

C. same

D. lower

E. depends on quality of fuel

1559. Descripancies of bar chart techniques are________________?
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A. effective monitoring/controlling cant be done

B. free time available for an activity cant be predicted

C. consequential effects of lack in one activity on omer

D. all of the above

E. consequential effects of lack in one activity on the finish date

1560. Frederick W. Taylor introduced a system of working known as________________?
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A. line organisation

B. functional organisation

C. effective organisation

D. line and staff organisation

E. none of the above

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