# Pelton Wheel - I

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| By Manish Singh
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Manish Singh
Community Contributor
Quizzes Created: 2 | Total Attempts: 466
Questions: 15 | Attempts: 363

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• 1.

### Design of Pelton wheel means the following data is to be determined

• A.

A) Width of buckets

• B.

B) Depth of buckets

• C.

C) Number of buckets

• D.

D) All of the mentioned

D. D) All of the mentioned
Explanation
Explanation: In design of Pelton wheel we determine diameter of jet, diameter of runner, Width of buckets, Depth of buckets, Number of buckets on runner.

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• 2.

### The width of buckets of Pelton wheel is _________________

• A.

A) 2 times diameter of jet

• B.

B) 3 times diameter of jet

• C.

C) 4 times diameter of jet

• D.

D) 5 times diameter of jet

D. D) 5 times diameter of jet
Explanation
Explanation: To obtain Pelton wheel of higher efficiency, width of buckets is specified as 5 times diameter of jet by considering several experimental observations.

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• 3.

### The depth of buckets of Pelton wheel ____________

• A.

A) 1.2 times diameter of jet

• B.

B) 1.3 times diameter of jet

• C.

C) 1.4 times diameter of jet

• D.

D) 1.5 times diameter of jet

A. A) 1.2 times diameter of jet
Explanation
Explanation: To obtain Pelton wheel of higher efficiency, depth of buckets is specified as 1.2 times diameter of jet by considering several experimental observations.

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• 4.

### The ratio of pitch diameter of Pelton wheel to diameter of jet is known as ___________

• A.

A) Speed ratio

• B.

B) Jet ratio

• C.

C) Velocity ratio

• D.

D) Co-efficient of velocity

B. B) Jet ratio
Explanation
Explanation: The ratio of pitch diameter of Pelton wheel to diameter of jet is known as jet ratio.

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• 5.

### Find the pitch diameter of runner D, if jet ratio m and diameter of jet d are given as 10 and 125mm.

• A.

A) 1.25 meters

• B.

B) 1.5 meters

• C.

C) 2 meters

• D.

D) 1.2 meters

A. A) 1.25 meters
Explanation
Explanation: Expression for jet ratio is m=D/d which is 10*0.125= 1.25 meters.

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• 6.

### 6. The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is ___________

• A.

A) 80mm

• B.

B) 75mm

• C.

C) 90mm

• D.

D) 82mm

B. B) 75mm
Explanation
Explanation: The expression for measuring number of buckets is 15 + diameter of runner/2 times diameter of jet by using this expression we get diameter of jet as 75mm.

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• 7.

### In most of cases the value of jet ratio is _______________

• A.

A) 10

• B.

B) 11

• C.

C) 12

• D.

D) 13

C. C) 12
Explanation
Explanation: Jet ratio is 12 because in most of Pelton turbines diameter of runner is 12 times the diameter of jet.

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• 8.

### Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet)

• A.

A) 15 + D/2d

• B.

B) 15 + 3D/2d

• C.

C) 15 + D/d

• D.

D) 15 + 2D/d

A. A) 15 + D/2d
Explanation
Explanation: To obtain Pelton wheel of higher efficiency, number of buckets is specified as 15 + D/2d by considering several experimental observations.

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• 9.

### ____________ is obtained by dividing total rate of flow through the turbine by rate of flow through single jet.

• A.

A) Number of jets

• B.

B) Diameter of jets

• C.

C) Velocity of jets

• D.

D) Speed ratio

A. A) Number of jets
Explanation
Explanation: Total discharge is sum of individual discharges hence, by dividing total rate of flow through the turbine by rate of flow through single jet we get number of jets.

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• 10.

### If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets.

• A.

A) 400mm

• B.

B) 500mm

• C.

C) 420mm

• D.

D) 425mm

D. D) 425mm
Explanation
Explanation: The expression for measuring width of buckets is 5*diameter of jet, which is 5*85=425mm.

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• 11.

### If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is ___________

• A.

A) 100mm

• B.

B) 105mm

• C.

C) 106mm

• D.

D) 102mm

D. D) 102mm
Explanation
Explanation: The expression for measuring depth of buckets is 1.2*diameter of jet, which is 1.2*85=102mm.

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• 12.

### If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately

• A.

A) 20

• B.

B) 22

• C.

C) 23

• D.

D) 25

D. D) 25
Explanation
Explanation: The expression for measuring number of buckets is 15 + diameter of runner/2 time’s diameter of jet, which are 15 + 1.5/2*0.085.

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• 13.

### The width of Pelton wheel should be 5 times the diameter of jet.

• A.

A) True

• B.

B) False

A. A) True
Explanation
Explanation: To obtain Pelton wheel of higher efficiency, width of buckets is specified as 5 times diameter of jet by considering several experimental observations.

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• 14.

### The ratio of diameter of jet to diameter of runner is _____________

• A.

A) 1:3

• B.

B) 1:6

• C.

C) 1:5

• D.

D) 3:4

B. B) 1:6
Explanation
Explanation: To obtain Pelton wheel of higher efficiency, diameter of runner is 5 times diameter of jet by considering several experimental observations.

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• 15.

### Turbines installed at Bhakra Nangal are.

• A.

A)    pelton wheels

• B.

B)    Francis turbines

• C.

C)    Kaplan turbines

• D.

D)    propeller turbines

A. A)    pelton wheels
Explanation
Explanation: pelton wheels

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Mar 26, 2020
Quiz Created by
Manish Singh

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