mechanical engineering MCQs – Page 16

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 Review each marked answer and report any item that may be outdated or unclear.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

301. Surging phenomenon in centrifugal com-pressor depends on ___________________?
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A. pressure ratio

B. all of the above

C. change in load

D. k up wrong statement ?

E. stagnation pressure at the outlet

F. mass flow rate

302. In nuclear fission each neutron that causes fission releases_______________?
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A. more than one new neutrons

B. one new neutron

C. no new neutron

D. at least one new neutron

E. many-fold neutrons

303. Francis, Kaplan and propeller turbines fall under the category of___________________?
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A. Impulse turbines

B. Axial flow turbines

C. Reaction turbines

D. Mixed flow turbines

E. Reaction-cum-impulse turbines

304. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?
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A. mixed flow

B. centrifugal

C. axial flow

D. none of the above

E. reciprocating

305. The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?
0

A. 1:02

B. 1:01

C. 1 : 1.2

D. 1:10

E. 1:05

306. The cold working of metals is carried out_________________?
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A. below the recrystallisation temperature

B. at any temperature

C. at the recrystallisation temperature

D. above the recrystallisation temperature

307. Indicator diagram of a reciprocating pump is a graph between________________?
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A. flow vs speed

B. pressure in cylinder vs swept volume

C. swept volume vs speed

D. flow vs swept volume

E. pressure vs speed

308. Efficiency of gas turbine is increased by________________ ?
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A. inter cooling

B. all of the above

C. reheating

D. adding a regenerator

E. none of the above

309. The compressor efficiecny is the__________________?
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A. isothermal H.P/indicated H.R

B. none Of the above

C. isothermal H.P./shaft H.R

D. total output/air input

E. compression work/motor input

310. Which of the following particles is the lightest__________________?
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A. neutron

B. proton

C. nucleus

D. electron

E. meson

311. Work ratio of a gas turbine plant is ratio of______________________?
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A. net work output and heat supplied

B. actual/heat drop and isentropic heat drop

C. net work output and work done by turbine

D. work done by turbine and net work output

E. work done by turbine and heat supplied

312. Impulse turbine is generally fitted______________________?
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A. about 2.5 m below the tail race to avoid cavitation

B. slightly below the tail race

C. about 2.5 m above the tail race to avoid cavitation

D. at the level of tail race

E. little above the tail race

313. Francis turbine is best suited for_____________________?
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A. all types of heads

B. low head installation up to 30 m

C. high head installation above 180 m

D. medium head application from 24 to 180 m

E. none of the above

314. Two coplanar couples having equal and opposite moments_________________?
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A. produce a couple and an unbalanced force

B. produce a moment of couple

C. balance each other

D. are equivalent

E. can not balance each other

315. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
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A. Wcos(a + )

B. Wtan(a-)

C. Wsin(a + )

D. W (sin a + cos ).

E. Wtan(a + )

316. Total heat is the heat required to__________________?
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A. change liquid into vapour

B. convert saturated steam into dry steam

C. change vapour into liquid

D. increase the temperature of a liquid or vapour

E. convert water into steam and superheat it

317. Each fission of U235 produces following number of fast neutrons per fission________________?
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A. 1 neutron

B. 1 neutrons

C. 1 2 neutrons

D. infinite

E. 2 neutrons

318. A single force and a couple acting in the same plane upon a rigid body_____________________?
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A. balance each other

B. produce moment of a couple

C. are equivalent

D. cannot balance each other

E. none of the above

319. The emissive power of a body depends upon its___________________?
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A. temperature

B. all of the above

C. physical nature

D. wave length

E. none of the above

320. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?
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A. 20 kg, ve sense

B. 20 kg, + ve sense

C. 10 kg, ve sense

D. 45 kg, + ve sense

E. 10 kg, + ve sense

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