mechanical engineering MCQs – Page 100

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 Review each marked answer and report any item that may be outdated or unclear.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

A. all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity

B. ratio of inertial force to force due to gravitation

C. ratio of inertial force to force due to surface tension

D. ratio of inertial force to force due to viscosity

1982. At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
0

A. 303K

B. 273.16K

C. 0K.

D. 300K

E. 373K

1983. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm. The pressure at 2.5 m below the oil surface will be __________________?
0

A. 3 metres of water column

B. 3.5 metres of water column

C. 2 metres of water column

D. none of the above

E. 4 m of water column

1984. Orsat meter is used for__________________?
0

A. volumetric analysis of the flue gases

B. mass flow of the flue gases

C. none of the above

D. gravimetric analysis of the flue gases

E. measuring smoke density of flue gases

1985. Lancashire boiler is of____________________?
0

A. natural cirulation type

B. internally fired type

C. stationary<fire tube-type

D. horizontal type

E. all of the above

1986. Hygrometery deals with the_________________?
0

A. density measurement

B. pressure of air

C. Hygroscopic substances

D. temperature of air

E. water vapour in air

1987. When the flow parameters at any given instant remain same at every point, then flow is said to be___________________?
0

A. steady state

B. quasi static

C. uniform

D. laminar

E. static

1988. A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?
0

A. 218 kg/cm2 abs and 540C

B. 1 kg/cm2 and 100C

C. 100 kg/cm2 abs and 373C

D. 100 kg/cm2 and 540C

E. 218 kg/cm2 abs and 373C

1989. The latent heat of steam with increase of pressure__________________?
0

A. none of the above

B. decreases

C. increases

D. remains same

E. behaves unpredictably

1990. Cochran boiler is a__________________?
0

A. forced circulating boiler

B. veritcal water-tube boiler

C. horizontal fire-tube boiler

D. horizontal water-tube boiler

E. vertical fire tube boiler

1991. Coke is produced by__________________?
0

A. enriching carbon in the coal

B. binding the pulverised coal into brick-etts

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. pulverising coal in inert atmosphere

E. heating wood in a limited supply of air at temperatures below 300GC

1992. 1 kg.m is equal to_________________?
0

A. 539 Joules

B. All Joules

C. 102 Joules

D. 9.81 Joules

E. 427 Joules

1993. The speed of sound in a ideal gas varies directly as its__________________?
0

A. pressure

B. absolute temperature

C. temperature

D. density

E. modulus of elasticity

1994. Cavitation will begin when__________________?
0

A. pressure is increased

B. pressure becomes more than critical pressure

C. flow is increased

D. none of the above

E. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

1995. Equivalent evaporation of water is the evaporation for a feed water supply at 100C__________________?
0

A. and its corresponding conversion into dry saturated steam at 100C and 1.033 kg/cm2

B. and its corresponding conversion into dry steam at desired boiler pressure

C. conversion into steam at the same pres-sure at which feed water is supplied

D. conversion into steam at atmospheric condition

E. none of the above

1996. Choose the wrong statement?
0

A. Viscosity of liquids is appreciably affected by change in pressure

B. Viscosity of liquids decreases with in-crease in temperature

C. Viscosity is due primarily to interaction between fluid molecules

D. Viscosity is expressed as poise, stoke, or saybolt seconds

E. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

1997. Principle of similitude forms the basis of_________________?
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A. hydraulic designs

B. comparing similarity between design and actual equipment

C. designing models so that the result can be converted to prototypes

D. comparing two identical equipments

E. performing acceptance tests

1998. The property of fluid by virtue of which it offers resistance to shear is called________________?
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A. adhesion

B. viscosity

C. cohesion

D. all of the above

E. surface tension

1999. The shell diameter and length of locomotive boiler are_______________?
0

A. 1 m, 4 m

B. 1.5 m, 8 m

C. 2 m, 4 m

D. 1.5 m, 6 m

E. 1.5 m, 4 m

2000. Choose the correct relationship ?
0

A. kinematicviscosity = dynamicviscosity x density

B. dynamicviscosity = kinematicviscosity x density

C. hydrostaticforce = surface tension x gravity

D. specific gravity = gravity x density

E. gravity = specific gravity x density

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