Mechanical Engineering MCQs

Page No. 24

In an immersed body, centre of pressure is __________________?


aat the centre of gravity

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babove the centre of gravity

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cbelow be centre of gravity

✓


dcould be above or below e.g. depend¬ing on density of body and liquid

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Gradually varied flow is__________________?


asteady uniform

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bnon-steady non-uniform

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cnon-steady uniform

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dsteady non-uniform

✓


View Answer steady non-uniform

The flow which neglects changes in a transverse direction is known as_________________?


aone dimensional flow

✓


buniform flow

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csteady flow

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dturbulent flow

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View Answer one dimensional flow

A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?


a0.83

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b0.6

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c0.4

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d0.3

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View Answer 0.6

Uniform flow occurs when_____________________?


athe direction and magnitude of the velocity at all points are identical

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bthe velocity of successive fluid paiticles, at any point, is the same at successive periods of time

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cthe magnitude and direction of the velocity do not change from point to point in the fluid

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dthe fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure

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At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?


aminimum

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bmaximum

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czero

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dcould be any value

✓


View Answer could be any value

Two pipe systems can be said to be equivalent, when the following quantities are same__________________?


afriction loss and flow

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blength and diameter

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cflow and length

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dfriction factor and diameter

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For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?


aratio of inertial force to force due to viscosity

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bratio of inertial force to force due to gravitation

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cratio of inertial force to force due to surface tension

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

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Cavitation will begin when__________________?


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

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bpressure becomes more than critical pressure

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cflow is increased

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dpressure is increased

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A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?


a10 kg

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b100 kg

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c1000 kg

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d1 kg

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View Answer 10 kg

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