If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water, the horse power required will be

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If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water, the horse power required will be

A. Same

B. 0.75 B.H.P.

C. B.H.P./0.75

D. 1.5 B.H.P.

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The speed of a turbine runner is

A. Directly proportional to H^1/2

B. Inversely proportional to H^1/2

C. Directly proportional to H^3/2

D. Inversely proportional to H^3/2

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In a centrifugal pump, the regulating valve is provided on the

A. Casing

B. Delivery pipe

C. Suction pipe

D. Impeller

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A Pelton wheel is

A. Tangential flow impulse turbine

B. Inward flow impulse turbine

C. Outward flow impulse turbine

D. Inward flow reaction turbine

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By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

A. 39.2 %

B. 48.8 %

C. 84.8 %

D. 88.4 %

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The cavitation in reaction turbines is avoided, to a great extent by

A. Installing the turbine below the tail race level

B. Using stainless steel runner of the turbine

C. Providing highly polished blades to the runner

D. All of the above

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Low specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. None of the above

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The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A. Slow speed pump with radial flow at outlet

B. Medium speed pump with radial flow at outlet

C. High speed pump with radial flow at outlet

D. High speed pump with axial flow at outlet

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A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

A. 10 r.p.m.

B. 20 r.p.m.

C. 40 r.p.m.

D. 80 r.p.m.

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Casting of a centrifugal pump is designed so as to minimize

A. Friction loss

B. Cavitations

C. Static head

D. Loss of kinetic energy

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For 450 m head of water, _________ shall be used.

A. Pelton wheel

B. Kaplan turbine

C. Francis turbine

D. None of these

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If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

A. No flow will take place

B. Cavitation will be formed

C. Efficiency will be low

D. Excessive power will be consumed

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In axial flow fans and turbines, fluid enters and leaves as follows

A. Radially, axially

B. Axially, radially

C. Axially, axially

D. Radially, radially

Discuss this answer

Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

A. 39.2 %

B. 49.2 %

C. 68.8 %

D. 84.8 %

Discuss this answer

Francis turbine is best suited for

A. Medium head application from 24 to 180 m

B. Low head installation up to 30 m

C. High head installation above 180 m

D. All types of heads

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Pressure intensifier increases the pressure in proportion to

A. Ratio of diameters

B. Square of ratio of diameters

C. Inverse ratio of diameters

D. Square of inverse ratio of diameters

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Impulse turbine is generally fitted

A. At the level of tail race

B. Little above the tail race

C. Slightly below the tail race

D. About 2.5 m above the tail race to avoid cavitations.

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High specific speed of turbine implies it is

A. Propeller turbine

B. Francis turbine

C. Impulse turbine

D. None of the above

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The discharge through a turbine is

A. Directly proportional to H^1/2

B. Inversely proportional to H^1/2

C. Directly proportional to H^3/2

D. Inversely proportional to H^3/2

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Which of the following statement is correct?

A. The centrifugal pump is suitable for large discharge and smaller heads.

B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.

C. The efficiency of centrifugal pump is less as compared to reciprocating pump.

D. All of the above

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Hydraulic accumulator is used for

A. Accumulating oil

B. Supplying large quantities of oil for very short duration

C. Generally high pressures to operate hydraulic machines

D. Supplying energy when main supply fails

Discuss this answer

Maximum impulse will be developed in hydraulic ram when

A. Waste valve closes suddenly

B. Supply pipe is long

C. Supply pipe is short

D. Ram chamber is large

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A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

A. Kinetic head

B. Velocity head

C. Manometric head

D. Static head

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Motion of a liquid in a volute casing of a centrifugal pump is an example of

A. Rotational flow

B. Radial

C. Forced spiral vortex flow

D. Spiral vortex flow

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The hydraulic efficiency of an impulse turbine is the

A. Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

B. Ratio of the actual work available at the turbine to the energy imparted to the wheel

C. Ratio of the work done on the wheel to the energy of the jet

D. None of the above

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The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

A. [2(V_r - v) v]/ V_r²

B. 2(V_r + v) v]/ V_r²

C. [(V_r - v) v]/ V_r

D. [(V_r + v) v]/ V_r

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The angle of taper on draft tube is

A. Greater than 15°

B. Greater than 8°

C. Greater than 5°

D. Less than 8°

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Which of the following statement is correct as regard to water wheels?

A. They have slow speeds

B. They are suitable even for low water heads

C. They give constant efficiency, even if the discharge is not constant

D. All of the above

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Which of the following turbine is preferred for 0 to 25 m head of water?

A. Pelton wheel

B. Kaplan turbine

C. Francis turbine

D. None of these

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Puck up the wrong statement about centrifugal pump

A. Discharge a diameter

B. Head a speed²

C. Head a diameter

D. Power a speed⁴

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Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)

A. (w H_m) / (Q × η_o)

B. (w H_m Q) / η_o

C. (w Q) / (H_m × η_o)

D. (w Q η_o) / H_m

Discuss this answer

Accepted Answer

B. 0.75 B.H.P.

If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water, the horse power required will be

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The speed of a turbine runner is

In a centrifugal pump, the regulating valve is provided on the

A Pelton wheel is

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

The cavitation in reaction turbines is avoided, to a great extent by

Low specific speed of a pump implies it is

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

Casting of a centrifugal pump is designed so as to minimize

For 450 m head of water, _________ shall be used.

If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

In axial flow fans and turbines, fluid enters and leaves as follows

Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

Francis turbine is best suited for

Pressure intensifier increases the pressure in proportion to

Impulse turbine is generally fitted

High specific speed of turbine implies it is

The discharge through a turbine is

Which of the following statement is correct?

Hydraulic accumulator is used for

Maximum impulse will be developed in hydraulic ram when

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

Motion of a liquid in a volute casing of a centrifugal pump is an example of

The hydraulic efficiency of an impulse turbine is the

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

The angle of taper on draft tube is

Which of the following statement is correct as regard to water wheels?

Which of the following turbine is preferred for 0 to 25 m head of water?

Puck up the wrong statement about centrifugal pump

Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)

Also checkout

If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water, the horse power required will be

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The speed of a turbine runner is

In a centrifugal pump, the regulating valve is provided on the

A Pelton wheel is

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

The cavitation in reaction turbines is avoided, to a great extent by

Low specific speed of a pump implies it is

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

Casting of a centrifugal pump is designed so as to minimize

For 450 m head of water, _________ shall be used.

If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

In axial flow fans and turbines, fluid enters and leaves as follows

Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

Francis turbine is best suited for

Pressure intensifier increases the pressure in proportion to

Impulse turbine is generally fitted

High specific speed of turbine implies it is

The discharge through a turbine is

Which of the following statement is correct?

Hydraulic accumulator is used for

Maximum impulse will be developed in hydraulic ram when

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

Motion of a liquid in a volute casing of a centrifugal pump is an example of

The hydraulic efficiency of an impulse turbine is the

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

The angle of taper on draft tube is

Which of the following statement is correct as regard to water wheels?

Which of the following turbine is preferred for 0 to 25 m head of water?

Puck up the wrong statement about centrifugal pump

Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

Also checkout

Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)