[A]. True
[B]. False
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✅ The correct answer is option A.
Hydraulic Machines MCQs
The discharge of a centrifugal pump working under constant head __________ with the speed.
[A]. increases
[B]. decreases
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✅ The correct answer is option A.
The efficiency of a centrifugal pump will be maximum when the blades are bent backward.
[A]. Yes
[B]. No
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✅ The correct answer is option A.
The efficiency of a Pelton wheel working under constant head __________ with the increase in power.
[A]. remains same
[B]. increases
[C]. decreases
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✅ The correct answer is option B.
The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.
[A]. True
[B]. False
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✅ The correct answer is option A.
The speed of a turbine runner is
[A]. directly proportional to H1/2
[B]. inversely proportional to H1/2
[C]. directly proportional to H3/2
[D]. inversely proportional to H3/2
✅ The correct answer is option A.
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.)
[A]. L.A.N
[B]. 2 L.A.N
[C].
[D].
✅ The correct answer is option D.
A hydraulic coupling belongs to the category of
[A]. power absorbing machines
[B]. power developing machines
[C]. energy transfer machines
[D]. energy generating machines
✅ The correct answer is option C.
For centrifugal pump impeller, the maximum value of the vane exit angle is
[A]. 10° to 15°
[B]. 15° to 20°
[C]. 20° to 25°
[D]. 25° to 30°
✅ The correct answer is option C.
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
✅ The correct answer is option C.