mechanical engineering MCQs – Page 166

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 Review each marked answer and report any item that may be outdated or unclear.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

3301. All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________?
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A. One

B. Four

C. Two

D. Half

3302. The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio
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A. None of these

B. Equal

C. Lower

D. Higher

3303. Which of the following solid fuel has high carbon content?
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A. Peat

B. Coke

C. None of these

D. Coal

3304. The average calorific value of wood is about : __________?
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A. 25000 kj/kg

B. 33500 kj/kg

C. 23000 kj/kg

D. 19700 kj/kg

3305. The part load efficiency of a carburettor is,___________________?
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A. Constant

B. Maximum

C. Poor

D. Optimum

3306. Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?
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A. Not supercharged

B. Charged

C. Supercharged

D. Supercharged provided its speed is low

3307. In turbulence chamber in diesel engine__________________?
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A. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

B. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

C. there are no valves

D. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

E. fuel is partly burnt by spark

3308. Deposition of carbon in petrol engine cylinder would result in increase of__________________?
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A. compression ratio

B. swept volume

C. volumetric efficiency

D. clearance volume

E. mean effective pressure

3309. Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?
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A. Brown coal

B. Hard coke