mechanical engineering MCQs – Page 104

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 Review each marked answer and report any item that may be outdated or unclear.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

2061. Froude number is significant in__________________?
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A. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ships hulls

B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. none of the above

D. supersonics, as with projectile and jet propulsion

E. all of the above

2062. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?
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A. 5.0 m

B. 2.5 m

C. 2.4 m

D. 4.0 m

E. 3.0 m

2063. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?
0

A. V/T

B. head of water (h)

C. h3/1

D. h2

E. h2

2064. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is _________________?
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A. 9.75 m/sec2

B. 9 m/sec

C. 10m/sec2

D. 9.81 m/sec2

E. 10.2/m sec

2065. Which of the following is a water tube boiler_________________?
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A. Babcock and Wilcox boiler

B. Cochran boiler

C. locomotive boiler

D. Cornish boiler

E. Lancashire boiler

2066. For a body floating in a liquid the normal pressure exerted by the liquid acts at ____________________?
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A. bottom surface of the body

B. all of the above

C. e.g. of the body

D. metacentre

E. all points on the surface of the body

2067. Sublimation region is the region where__________________?
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A. liquid and vapour phases are in equilibrium

B. none of the above

C. solid and liquid phases are in equilibrium

D. solid and vapour phases are in equi-librium

E. solid, liquid and vapour phases are in equilibrium

2068. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
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A. former is used for high installed capacity

B. former occupies less space for same power

C. chances of explosion are less in former case

D. rate of steam flow is more in former case

E. former generates steam at high pressure

2069. The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
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A. metacentre

B. centre of gravity

C. centroid

D. centre of buoyancy

E. centre of pressure

2070. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. W between P and F

B. F between W and P

C. none of the above

D. W, P and F all on one side

E. P between W and F

2071. Vacuum for reciprocating steam engines compared to steam turbines is__________________?
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A. equal

B. more

C. none of the above

D. could be more or less depending on the size of plant

E. less

2072. Which tool is used to measure gap size in a rough alignment?
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A. Measuring tape

B. Inside caliper

C. Feeler gage

D. Dial indicator

2073. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
0

A. first decreases and then increases

B. decreases

C. remains unaffected

D. increases

E. first increases and then decreases

2074. The part of the coupling that actually transmits power and rotation from one shaft to the other shaft is_________?
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A. key

B. gap

C. driver

D. hub

2075. The hydraulic turbines are also known as : ___________?
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A. water turbines

B. steam turbines

C. combustion turbines

D. Gas turbines

2076. Sulphur content of fuels is very important to the plant operators because it____________________?
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A. has highly corrosive effect

B. facilitates ash removal

C. promotes complete combustion

D. retards electric precipitation

E. has high heating value

2077. The overall efficiency of thermal power plant is________________?
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A. boiler efficiency, turhine efficiecny, generator efficiency

B. regenerative cycle efficiency

C. all the three above plus gas cycle efficiency

D. rankine cycle efficiency

E. carnot cycle efficiency

2078. The behaviour of coal in a furnace is determained by_______________________?
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A. the proximate analysis

B. the content of sulphur

C. its type

D. the exact analysis

E. the content of ash and heating value

2079. Deaeration of feed water is carried out because it reduces ____________________?
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A. cavitation of .boiler feed pumps

B. weight of water to be handled

C. heat transfer coefficient

D. corrosion caused by oxygen

E. pH value of water

2080. In a recuperative air preheater, the heat is transferred____________________?
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A. heat is transferred by bleeding some gases from furnace

B. from a metal wall from one medium to another

C. from heating an itermediate material and then heating the air from this material

D. none of the above

E. by direct mixing ,

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