mechanical engineering MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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

141. A turbine pump is basically a centrifugal pump equipped additionally with_________________?
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A. totally submerged operation facility

B. backward curved blades

C. adjustable blades

D. vaned diffusion casing

E. inlet guide blades

142. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?
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A. horizontal

B. steep

C. first rise and then fall

D. nearly horizontal

E. none of the above

143. For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?
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A. other factors control it

B. decrease

C. unpredictable

D. increase

E. remain unaffected

144. Propulsive efficiency is defined as ratio of___________________?
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A. propulsive power and fuel input

B. none of the above

C. engine output and propulsive power

D. thrust power and propulsive power

E. thrust power and fuel energy

145. The indicated work per unit mass of air delivered is___________________?
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A. not affected by clearance volume

B. greatly affected by clearance volume

C. directly proportional to clearance volume

D. inversely proportional to clearance volume

146. For starting an axial flow pump, its delivery valve should be____________________?
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A. could be either open or closed

B. depends on starting condition and flow desired

C. partly open and partly closed

D. closed

E. open

147. Which of the following fuels can be used in turbojet engines _____________________?
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A. kerosene

B. demethylated spirit

C. methyl alcohol

D. liquid hydrogne

E. high speed diesel oil

148. Axial flow compressor has the following advantage over centrifugal compressor__________________?
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A. higher average velocities

B. aerofoil blades are used

C. higher pressure ratio per stage

D. none of the above

E. larger air handling ability per unit frontal area

149. The nuclear power plant at Tarapur has the following reactor________________?
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A. pressurised water

B. none of the above

C. fast breeder

D. sodium graphite

E. boiling water

150. Reflector in nuclear plants is used to________________?
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A. shield the radioactivity completely

B. check polllution

C. return the neutrons back into the core

D. is not used

E. conserve energy

151. Breeder reactor has a conversion ratio of_____________________?
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A. less than unity

B. unity

C. infinity

D. zero

E. more than unity

152. Gas turbine blades are given a rake___________________?
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A. in the direction of motion of blades

B. equal to zero

C. none of the above

D. opposite to the direction of motion of blades

E. depending on the velocity

153. A nuclear fission produces energy of following order in MeV___________________?
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A. 20,000

B. 20

C. 200

D. 2000

E. 2 x 105

154. The volumetric efficiency of a compressor falls roughly as follows for every 5C increase in atmospheric temperature__________________?
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A. 0.10%

B. 0.50%

C. 10%.

D. 5%

E. 1%

155. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?
0

A. 49.20%

B. 39.2%

C. 84.80%

D. 68.80%

E. 91.6%.

156. Head developed by a centrifugal pump depends on___________________?
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A. speed

B. A. and B. above

C. impeller diameter

D. type of casing

E. fluid density

157. Pressure ratio in gas turbines is the ratio of ____________________?
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A. pressures across the turbine

B. none of the above

C. highest pressure to exhaust pressure

D. compressor pressure ratio

E. inlet pressure to exhaust pressure

158. Boiling water reactor uses the following as moderator, coolant and working fluid________________?
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A. molten lead

B. ordinary fluid

C. heavy water

D. none of the above

E. hydrogen gas

159. Surging is the phenomenon of___________________?
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A. motion of air at sonic velocity

B. unsteady, periodic and reversed flow

C. air stream not able to follow the blade contour

D. production of no air pressure

E. air stream blocking the passage

160. The commonly used material for shielding is__________________?
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A. black carbon papers

B. graphite or cadmium

C. lead and tin

D. thick galvanised sheets

E. lead or concrete

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