In a centrifugal pump casing, the flow of water leaving the impeller, is

Question

In a centrifugal pump casing, the flow of water leaving the impeller, is

A. Rectilinear flow

B. Radial flow

C. Free vortex motion

D. Forced vortex

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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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Runaway speed of a hydraulic turbine is

A. Full load speed

B. The speed at which turbine runner will be damaged

C. The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

D. The speed corresponding to maximum overload permissible

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A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

A. Strain

B. Pressure

C. Kinetic

D. None of these

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The number of buckets on the periphery of a Pelton wheel is given by

A. (D/2d) + 5

B. (D/2d) + 10

C. (D/2d) + 15

D. (D/2d) + 20

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The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A. 2V/(v_r - v)

B. 2V/(v_r + v)

C. V/(v_r - v)

D. V/(v_r + v)

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

A. Two

B. Four

C. Six

D. Eight

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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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Overall efficiency of a centrifugal pump is the ratio of

A. Energy available at the impeller to the energy supplied to the pump by the prime mover

B. Actual workdone by the pump to the energy supplied to the pump by the prime mover

C. Energy supplied to the pump to the energy available at the impeller

D. Manometric head to the energy supplied by the impeller per kN of water

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The runaway speed of a hydraulic turbine is the speed

A. At full load

B. At which there will be no damage to the runner

C. Corresponding to maximum overload permissible

D. At which the turbine will run freely without load

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A hydraulic coupling belongs to the category of

A. Power absorbing machines

B. Power developing machines

C. Energy transfer machines

D. Energy generating machines

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Which of the following pump is preferred for flood control and irrigation applications?

A. Centrifugal pump

B. Axial flow pump

C. Mixed flow pump

D. Reciprocating pump

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Air vessels in reciprocating pump are used to

A. Smoothen flow

B. Reduce acceleration to minimum

C. Increase pump efficiency

D. Save pump from cavitations

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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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Which of the following statement is wrong?

A. The reaction turbines are used for low head and high discharge.

B. The angle of taper on draft tube is less than 8°.

C. An impulse turbine is generally fitted slightly above the tail race.

D. A Francis turbine is an impulse turbine.

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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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Which of the following statement is correct?

A. In an impulse turbine, the water impinges on the buckets with pressure energy.

B. In a reaction turbine, the water glides over the moving vanes with kinetic energy.

C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.

D. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

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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 power of the wheel is

A. 0.25 kW

B. 0.75 kW

C. 1.75 kW

D. 3.75 kW

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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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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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According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

A. Directly as fan speed

B. Square of fan speed

C. Cube of fan speed

D. Square root of fan speed

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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 ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

A. Geometric similarity

B. Kinematic similarity

C. Dynamic similarity

D. None of these

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When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

A. Horizontal

B. Nearly horizontal

C. Steep

D. First rise and then fall

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A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

A. 0.26

B. 0.36

C. 0.46

D. 0.56

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The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

A. Slow speed with radial flow at outlet

B. Medium speed with radial flow at outlet

C. High speed with radial flow at outlet

D. High speed with axial flow at outlet

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The flow rate in gear pump

A. Increases with increase in pressure

B. Decreases with increase in pressure

C. More or less remains constant with increase in pressure

D. Unpredictable

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High specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. Any one of the above

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Slip of a reciprocating pump is defined as the

A. Ratio of actual discharge to the theoretical discharge

B. Sum of actual discharge and the theoretical discharge

C. Difference of theoretical discharge and the actual discharge

D. Product of theoretical discharge and the actual discharge

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The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

A. (W/p) × (A/a)

B. (p/W) × (a/A)

C. (W/p) × (a/A)

D. (p/W) × (A/a)

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The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is

A. η_h = η_o × η_m

B. η_m = η_m × η_h

C. η_o = η_h × η_m

D. None of these

Discuss this answer

Accepted Answer

C. Free vortex motion

In a centrifugal pump casing, the flow of water leaving the impeller, is

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

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

Runaway speed of a hydraulic turbine is

A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

The number of buckets on the periphery of a Pelton wheel is given by

The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

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

The hydraulic efficiency of an impulse turbine is the

Overall efficiency of a centrifugal pump is the ratio of

The runaway speed of a hydraulic turbine is the speed

A hydraulic coupling belongs to the category of

Which of the following pump is preferred for flood control and irrigation applications?

Air vessels in reciprocating pump are used to

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

Which of the following statement is wrong?

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

Which of the following statement is correct?

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 power of the wheel is

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

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

According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

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

If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

The flow rate in gear pump

High specific speed of a pump implies it is

Slip of a reciprocating pump is defined as the

The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is

Also checkout

In a centrifugal pump casing, the flow of water leaving the impeller, is

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

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

Runaway speed of a hydraulic turbine is

A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

The number of buckets on the periphery of a Pelton wheel is given by

The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

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

The hydraulic efficiency of an impulse turbine is the

Overall efficiency of a centrifugal pump is the ratio of

The runaway speed of a hydraulic turbine is the speed

A hydraulic coupling belongs to the category of

Which of the following pump is preferred for flood control and irrigation applications?

Air vessels in reciprocating pump are used to

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

Which of the following statement is wrong?

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

Which of the following statement is correct?

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 power of the wheel is

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

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

According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

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

If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

The flow rate in gear pump

High specific speed of a pump implies it is

Slip of a reciprocating pump is defined as the

The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

Also checkout

The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is