51. The working of which of the following hydraulic units is based on Pascal’s law?
Air lift pump
Jet pump
Hydraulic coupling
Hydraulic press
✅ The correct answer is option D.
Hydraulic Machines MCQs
52. Which of the following pump is generally used to pump highly viscous fluid?
Centrifugal pump
Reciprocating pump
Air lift pump
Screw pump
✅ The correct answer is option D.
55. Overall efficiency of a centrifugal pump is the ratio of
energy available at the impeller to the energy supplied to the pump by the prime mover
actual workdone by the pump to the energy supplied to the pump by the prime mover
energy supplied to the pump to the energy available at the impeller
manometric head to the
✅ The correct answer is option B.
56. The power of a centrifugal pump working under constant head and discharge increases with the speed.
TRUE
FALSE
✅ The correct answer is option A.
57. The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.
equal to
1.2 times
1.8 times
double
✅ The correct answer is option B.
58. The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
✅ The correct answer is option A.
59. 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
✅ The correct answer is option A.