HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

μπ²N/60t) × (R₁³ - R₂³)

(μπ²N/60t) × (R₁ - R₂)

(μπ²N/60t) × (R₁⁴ - R₂⁴)

(μπ²N/60t) × (R₁² - R₂²)

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A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.87

0.78

0.64

0.46

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The maximum number of jets, generally, employed in an impulse turbine without jet interference are

Two

Eight

Six

Four

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In an outward flow reaction turbine

The flow of water is partly radial and partly axial

The water enters the wheel at the outer periphery and then flows towards the centre of the wheel

The water flows parallel to the axis of the wheel

The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel

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In open channels, the specific energy is the

Total energy measured above the horizontal datum

Total energy per unit discharge

Total energy measured with respect to the datum passing through the bottom of the channel

Kinetic energy plotted above the free surface of water

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Delivery head of a centrifugal pump is

Directly proportional to N²

Inversely proportional to N²

Directly proportional to N

Inversely proportional to N

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The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called

Reaction

Buoyancy

Metacentre

Up-thrust

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The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

Volumetric efficiency

Manometric efficiency

Overall efficiency

Mechanical efficiency

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One poise is equal to

100 N-s/m2

1 N-s/m2

10 N-s/m2

0.1 N-s/m2

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The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.

Overall

Mechanical

Hydraulic

None of these

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