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Hydraulic and Fluid Machines - Interview Questions and Answers

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76. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc
A. 10 kg
B. 100 kg
C. 1000 kg
D. 1 kg
E. 10,000 kg.
Explanation:
77. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
A. minimum
B. maximum
C. zero
D. negative value
E. could be any value.
Explanation:
78. Cavitation will begin when
A. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
B. pressure becomes more than critical pressure
C. flow is increased
D. pressure is increased
E. none of the above.
Explanation:
79. A perfect gas
A. has constant viscosity
B. has zero viscosity
C. is incompressible
D. is of theoretical interest
E. none of the above.
Explanation:
80. Bernoulli equation deals with the law of conservation of
A. mass
B. momentum
C. energy
D. work
E. force.
Explanation:
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