What is the correct answer?

4

# In a Kaplan turbine runner, the numbers of blades are generally between

2 to 4

4 to 8

8 to 16

16 to 24

B. 4 to 8

### Related Questions

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4

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

Rotational flow

Radial

Forced spiral vortex flow

Spiral vortex flow

What is the correct answer?

4

# The discharge through a turbine is

Directly proportional to H1/2

Inversely proportional to H1/2

Directly proportional to H3/2

Inversely proportional to H3/2

What is the correct answer?

4

# The depth of the bucket for a Pelton wheel is generally ________ the diameter of jet.

Equal to

1.2 times

1.8 times

Double

What is the correct answer?

4

# The Fourneyron turbine is _________ reaction turbine.

An axial flow

An inward flow

An outward flow

A mixed flow

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4

# 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 discharge of wheel is

0.25 m3/s

0.5 m3/s

1.5 m3/s

2.5 m3/s

What is the correct answer?

4

# The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

What is the correct answer?

4

# Slip of a reciprocating pump is negative, when

Suction pipe is short and pump is running at low speeds

Delivery pipe is long and pump is running at high speeds

Suction pipe is short and delivery pipe is long and the pump is running at low speeds

Suction pipe is long and delivery pipe is short and the pump is running at high speeds

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4

# The undershot water wheels are those in which

The wheel runs entirely by the weight of water

The wheel runs entirely by the impulse of water

The wheel runs partly by the weight of water and partly by the impulse of water

None of the above

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4

# In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Designing new impeller

Trimming the impeller size to the required size by machining

Not possible

Some other alterations in the impeller

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4

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

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

What is the correct answer?

4

# A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is

175.4 r.p.m.

215.5 r.p.m.

241.5 r.p.m.

275.4 r.p.m

What is the correct answer?

4

# Delivery head of a centrifugal pump is

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

What is the correct answer?

4

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

Rectilinear flow

Radial flow

Free vortex motion

Forced vortex

What is the correct answer?

4

# For small discharge at high pressure, following pump is preferred

Centrifugal

Axial flow

Mixed flow

Reciprocating

What is the correct answer?

4

# The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H).

P/ √H

P/ H

P/ H3/2

P/ H²

What is the correct answer?

4

# The maximum number of jets generally employed in impulse turbine without jet interference is

4

6

8

12

What is the correct answer?

4

# An impulse turbine is used for

Low head of water

High head of water

Medium head of water

High discharge

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4

# Which of the following is not an impulse turbine?

Girad turbine

Turgo turbine

Pelton wheel

Kaplan turbine

What is the correct answer?

4

# The specific speed of a hydraulic turbine depends upon

Speed and power developed

Discharge and power developed

Speed and head of water

Speed, power developed and head of water

What is the correct answer?

4

# A turbine pump is basically a centrifugal pump equipped additionally with

Adjustable blades

Backward curved blades

Vaned diffusion casing

Inlet guide blades

What is the correct answer?

4

# The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Slow speed with radial flow at outlet

Medium speed with radial flow at outlet

High speed with radial flow at outlet

High speed with mixed flow at outlet

What is the correct answer?

4

# The static head of a centrifugal pump is equal to the ________ of suction head and delivery head.

Product

Difference

Sum

None of these

What is the correct answer?

4

# 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)

(w Hm) / (Q × ηo)

(w Hm Q) / ηo

(w Q) / (Hm × ηo)

(w Q ηo) / Hm

What is the correct answer?

4

# For starting an axial flow pump, its delivery valve should be

Closed

Open

Depends on starting condition and flow desired

Could be either open or closed

What is the correct answer?

4

# According to fan laws, for the fans having constant wheel diameters, the power demand varies

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

What is the correct answer?

4

# Which of the following pump is suitable for small discharge and high heads?

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

What is the correct answer?

4

# The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

[wa (V - v)]/2g

[wa (V - v)]/g

[wa (V - v)²]/2g

[wa (V - v²)]/g

What is the correct answer?

4

# In centrifugal pumps, maximum efficiency is obtained when the blades are

Straight

Bent forward

Bent backward

Radial

What is the correct answer?

4

# High specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

None of the above

What is the correct answer?

4

# Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

Hydraulic ram

Hydraulic intensifier

Hydraulic torque converter

Hydraulic accumulator