mechanical engineering MCQs – Page 6

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 Review each marked answer and report any item that may be outdated or unclear.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

101. In which case the air-fuel ratio is likely to be maximum _________________?
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A. 2-stroke engine

B. 4-stroke diesef engine

C. 4-stroke petrol engine

D. gas turbine

E. multi-cylinder engine

102. Water gas is produced by ___________________ ?
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A. passing air and a large amount of steam over waste coal at about 65C

B. same way as the natural gas

C. passing steam over incandescent coke

D. carbonisation of coal

E. partial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast

103. A compressor at high altitude will draw________________?
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A. same power

B. none of the above

C. more/less power depending on other factors

D. less power

E. more power

104. In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?
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A. given aerofoil section

B. radial

C. bent forward

D. bent backward

E. straight

105. In jet engines the compression ratio__________________?
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A. Varies linearly to the speed

B. is constant irrespective of variation in speed

C. varies as square of the speed

D. varies as square root of the speed

E. varies as cube of the speed

106. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
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A. none of the above

B. not possible

C. designing new impeller

D. some other alterations in the impeller

E. trimming the impeller size to the required size by machining

107. According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?
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A. none of the above

B. square root of fan speed

C. cube of fan speed

D. square of fan speed

E. directly as fan speed

108. In fast breeder reactors___________________?
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A. moderator may or may not be used

B. graphite is used as the moderator

C. any type of moderator can be used

D. moderator is dispensed with

E. heavy water is used as the moderator

109. Runaway speed of a hydraulic turbine is_________________?
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A. the speed corresponding to maximum overload permissible

B. none of the above.

C. the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

D. the speed at which turbine runner will be damaged

E. full load speed

110. Boiling water reactor employs__________________?
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A. double circuit system of coolant cycle

B. boiler

C. multi pass system

D. single circuit system

E. direct cycle of coolant system

111. The number of isotopes of hydrogen are _________________?
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A. 0

B. U

C. 1

D. 2

E. 3

112. Gas turbine works on_______________?
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A. Rankine cycle

B. Carnot cycle

C. Joule cycle

D. Brayton or Atkinson cycle

E. Erricsson cycle

113. Atomic number of an element in the periodic table represents the numbers of_________________?
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A. protons in the nucleus

B. electrons in the atom

C. electrons in me nucleus

D. neutrons in the atom

E. neutrons in the nucleus

114. Lancing is the operation of _________________?
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A. cutting a sheet of metal in a straight line along the length

B. bending a sheet of metal along a curved axis

C. removal of metal to the desired shape from the edge of a plate

D. cutting a sheet of metal through part of its length and then bending the cut portion

115. The work ratio of a gas turbine plant is defined as the ratio of__________________?
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A. actual heat drop and isentropic heat drop

B. net work output and heat supplied (6) net work output and work done by turbine

C. isentropic increase/drop in temperature and actual increase/ drop in temperature

D. net work output and isentropic heat drop

116. Multistage centrifugal pumps are used to obtain___________________?
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A. high discharge

B. pumping of viscous fluids

C. high head

D. high efficiency

E. high head and high discharge

117. The blades of gas turbine are made of_________________?
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A. high nicket alloy (neimonic)

B. stainless steel

C. mild steel

D. carbon steel

E. high alloy seel

118. U235 will undergo fission by__________________?
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A. none of the above

B. medium energy neutrons

C. low energy (slow) neutrons alone

D. either fast or slow neutrons

E. high energy (fast) neutrons alone

119. Amongst the following, the fissionable materials are________________?
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A. U238andPu239

B. U235andPu235

C. U243andPu235

D. U23iandPu233

E. U233andPu239

120. Work ratio of a gas turbine may be improved by f____________________?
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A. increasing the turbine work

B. A. and C. above

C. decreasing the turbine work

D. decreasing the compression work

E. increasing the compression work

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