1.
Design of Pelton wheel means the following data is to be determined
Correct Answer
D. D) All of the mentioned
Explanation
Answer: d
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.
2.
The width of buckets of Pelton wheel is _________________
Correct Answer
D. D) 5 times diameter of jet
Explanation
Answer: d
Explanation: To obtain Pelton wheel of higher efficiency, width of buckets is specified as 5 times diameter of jet by considering several experimental observations.
3.
The depth of buckets of Pelton wheel ____________
Correct Answer
A. A) 1.2 times diameter of jet
Explanation
Answer: a
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.
4.
The ratio of pitch diameter of Pelton wheel to diameter of jet is known as ___________
Correct Answer
B. B) Jet ratio
Explanation
Answer: b
Explanation: The ratio of pitch diameter of Pelton wheel to diameter of jet is known as jet ratio.
5.
Find the pitch diameter of runner D, if jet ratio m and diameter of jet d are given as 10 and 125mm.
Correct Answer
A. A) 1.25 meters
Explanation
Answer: a
Explanation: Expression for jet ratio is m=D/d which is 10*0.125= 1.25 meters.
6.
6. The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is ___________
Correct Answer
B. B) 75mm
Explanation
Answer: b
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.
7.
In most of cases the value of jet ratio is _______________
Correct Answer
C. C) 12
Explanation
Answer: c
Explanation: Jet ratio is 12 because in most of Pelton turbines diameter of runner is 12 times the diameter of jet.
8.
Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet)
Correct Answer
A. A) 15 + D/2d
Explanation
Answer: a
Explanation: To obtain Pelton wheel of higher efficiency, number of buckets is specified as 15 + D/2d by considering several experimental observations.
9.
____________ is obtained by dividing total rate of flow through the turbine by rate of flow through single jet.
Correct Answer
A. A) Number of jets
Explanation
Answer: a
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.
10.
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets.
Correct Answer
D. D) 425mm
Explanation
Answer: d
Explanation: The expression for measuring width of buckets is 5*diameter of jet, which is 5*85=425mm.
11.
If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is ___________
Correct Answer
D. D) 102mm
Explanation
Answer: d
Explanation: The expression for measuring depth of buckets is 1.2*diameter of jet, which is 1.2*85=102mm.
12.
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately
Correct Answer
D. D) 25
Explanation
Answer: d
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.
13.
The width of Pelton wheel should be 5 times the diameter of jet.
Correct Answer
A. A) True
Explanation
Answer: a
Explanation: To obtain Pelton wheel of higher efficiency, width of buckets is specified as 5 times diameter of jet by considering several experimental observations.
14.
The ratio of diameter of jet to diameter of runner is _____________
Correct Answer
B. B) 1:6
Explanation
Answer: b
Explanation: To obtain Pelton wheel of higher efficiency, diameter of runner is 5 times diameter of jet by considering several experimental observations.
15.
Turbines installed at Bhakra Nangal are.
Correct Answer
A. A) pelton wheels
Explanation
Answer: a
Explanation: pelton wheels