mechanical engineering MCQs – Page 92

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 Review each marked answer and report any item that may be outdated or unclear.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

1821. On Millier chart, the constant pressure lines_________________?
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A. are equally spaced throughout

B. none of the above

C. first rise up and then fall

D. diverge from left to right

E. diverge from right to left

1822. If no resistance is encountered by displacement, such a substance is known as ___________________?
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A. ideal fluid

B. water

C. perfect solid

D. fluid

E. gas

1823. Fire tube boilers are those in which__________________?
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A. flue gases pass through tubes and water around it

B. tubes are laid vertically

C. none of the above

D. forced circulation takes place

E. water passes through the tubes and flue gases around it

1824. Pick up false statement?
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A. For petrol and large gas engines, quantity governingds preferred

B. In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load

C. In hit and miss governing, fuel supply is completely cut off during one or more number of cycles

D. In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied

E. For close regulation of speed, combination of both quality and quantity governing is used

1825. Falling drops of water become spheres due to the property of ____________________?
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A. adhesion

B. viscosity

C. compressibility

D. cohesion

E. surface tension

1826. Two pipe systems can be said to be equivalent, when the following quantities are same__________________?
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A. length and diameter

B. friction loss and flow

C. friction factor and diameter

D. flow and length

E. velocity and diameter

1827. Evaporative capacity of boiler is expressed as____________________?
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A. kg of fuel fired

B. kg of water evaporated

C. kg of steam produced per kg of fuel fifed

D. kg of steam produced

E. steam pressure produced

1828. Units of surface tension are____________________?
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A. energy/unit area

B. distance

C. both of the above

D. it has no units

E. none of the above

1829. The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
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A. 1 to 1.75 m

B. 1 tp 1.25m

C. 2.25 to 4.5 m

D. 1.75 to 2.75 m

E. 2 to 4 m

1830. In locomotive boiler, maximum steam pressure is limited to_______________?
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A. 18 kg/cm2

B. 31 kg/cm2

C. 1 kg/cm2

D. 5 kg/cm2

E. 10 kg/cm2

1831. The state of vapour under saturation condition is described by_______________?
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A. temperature alone

B. dryness fraction alone

C. pressure and temperature

D. pressure alone

E. pressure and dryness fraction

1832. Alcohol is used in manometers because___________________?
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A. is provides suitable meniscus

B. it can provide longer column due to low density

C. it has low surface tension

D. it is clearly visible

E. it has low vapour pressure

1833. The water tubes in a babcock and wilcox boiler are__________________?
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A. horizontal

B. vertical and inclined

C. inclined

D. vertical

E. horizontal and inclined

1834. The lenght of Cornish boiler is of the order of _________________?
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A. 2-4 m

B. 3-5 m

C. 9-11 m

D. 7-9 m

E. 5-7.5 m

1835. The pressure at which latent heat of vaporisation of water is zero, is_________________?
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A. 100 kg/cm2

B. below atmospheric pressure

C. 1 kg/cm2

D. 225.6 kg/cm2

E. 170 kg/cm2

1836. Fluid is a substance that___________________?
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A. has the same shear stress.at a point regardless of its motion

B. cannot be subjected to shear forces

C. flows

D. cannot remain at rest under action of any shear force

E. always expands until it fills any container

1837. Hard coke is produced by carborisation of coal at_______________?
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A. atmospheric temperature

B. 500-600C

C. 95O-1100C

D. 70O-850C

E. 120O-1500C

1838. The ultimate analysis of fuel lists _____________________?
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A. moisture and ash free heating value

B. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

C. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

D. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

E. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

1839. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
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A. none of the above

B. 0.4

C. 0.5

D. 0.515

E. 0.5

1840. Size of boiler tubes is specified by___________________?
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A. outside diameter and inside diameter

B. mean diameter and thickness

C. inside diameter and thickness

D. outside diameter and thickness

E. outside diameter alone

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