Mechanical Engineering MCQs

Page No. 21

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


a373°K


b273.16°K


c303°K


d0°K.


View Answer 273.16°K

Pick up false statement?


aFor petrol and large gas engines, quantity governingds preferred


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


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


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


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


dtungsten in steels improves magnetic properties and hardenability



Practical fluids___________________?


aare viscous


bpossess surface tension


care compressible


dpossess all the above properties



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


afluid


bwater


cgas


dideal fluid


View Answer ideal fluid

Density of water is maximum at__________________?


a0°C


b0°K


c4°C


d100°C


View Answer 4°C

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


ait is incompressible


bit has uniform viscosity


cit has zero viscosity


dit is at rest


View Answer it is at rest

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


aremains same


bincreases


cdecreases


dshows erratic behavior



The bulk modulus of elasticity___________________?


ahas the dimensions of 1/pressure


bincreases with pressure


cis large when fluid is more compressible


dis independent of pressure and viscosity



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


a1000


b2100


c2700


d21,000


View Answer 21,000

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