191. Capacity of a rotary gear pump can be varied by
Changing the speed of rotation
Bleeding air into suction
Bypassing liquid from the suction or discharge line
All of the above
✅ The correct answer is option D.
Fluid Mechanics MCQs
192. Purpose of hydraulic accumulator is to
Ensure intermittant supply of hydraulic pressure
Increase the pressure and store/ accumulate it
Accumulate pressure to increase force
Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc
✅ The correct answer is option D.
193. The valve used for very remote and accurate control of fluid is a __________ valve.
Needle
Globe
Gate
Butterfly
✅ The correct answer is option A.
194. In an incompressible flow of fluid, the fluid
Temperature remains constant
Compressibility is greater than zero
Density does not change with pressure & temperature
Is frictionless
✅ The correct answer is option C.
195. In case of a pipe exit fitted with a nozzle, the
Conversion of kinetic head to pressure head is facilitated
Conversion of pressure head to kinetic head is facilitated
Power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head
Both B and C
✅ The correct answer is option D.
196. What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta?
0.64
1.65
0.32
0.94
✅ The correct answer is option A.
197. Bernoulli’s equation for steady, frictionless, continuous flow states that the __________ at all sections is same.
Total pressure
Total energy
Velocity head
None of these
✅ The correct answer is option B.
198. High specific speed of a pump implies that, it is a/an __________ pump.
Centrifugal
Mixed flow
Axial flow
None of these
✅ The correct answer is option C.
199. Gradually varying fluid flow is an example of __________ flow.
Non-steady uniform
Non-steady non-uniform
Steady uniform
Steady non-uniform
✅ The correct answer is option A.
200. __________ forces act on a particle moving through a stationary fluid.
Gravity
Drag
Buoyant
All of the above
✅ The correct answer is option D.