Mechanical Engineering MCQs

Page No. 21

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


a373°K

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b273.16°K

✓


c303°K

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d0°K.

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View Answer 273.16°K

Pick up false statement?


aFor petrol and large gas engines, quantity governingds preferred

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

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

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

✓



Pick up the wrong statement?


aaluminium in steel results in excessive grain growth

✓


bmanganese in steel induces hardness

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cnickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility

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dtungsten in steels improves magnetic properties and hardenability

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Practical fluids___________________?


aare viscous

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bpossess surface tension

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care compressible

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dpossess all the above properties

✓



If no resistance is encountered by displacement, such a substance is known as ___________________?


afluid

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bwater

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cgas

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dideal fluid

✓


View Answer ideal fluid

Density of water is maximum at__________________?


a0°C

✖


b0°K

✖


c4°C

✓


d100°C

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View Answer 4°C

The normal stress in a fluid will be constant in all directions at a point only if__________________________?


ait is incompressible

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bit has uniform viscosity

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cit has zero viscosity

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dit is at rest

✓


View Answer it is at rest

For very great pressures, viscosity of moss gases and liquids__________________?


aremains same

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bincreases

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cdecreases

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dshows erratic behavior

✓



The bulk modulus of elasticity___________________?


ahas the dimensions of 1/pressure

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bincreases with pressure

✓


cis large when fluid is more compressible

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dis independent of pressure and viscosity

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The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?


a1000

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b2100

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c2700

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d21,000

✓


View Answer 21,000

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