Hydraulic Machines MCQ Quiz - Multiple Choice Questions & Answers

1. Maximum impulse will be developed in hydraulic ram when

1. waste valve closes suddenly
2. supply pipe is long
3. supply pipe is short
4. ram chamber is large

2. A hydraulic accumulator normally consists of

1. two cylinders, two rams and a storage device
2. a cylinder and a ram
3. two co-axial rams and two cylinders
4. a cylinder, a piston, storage tank and control valve

3. A hydraulic intensifier normally consists of

1. two cylinders, two rams and a storage device
2. a cylinder and a ram
3. two co-axial rams and two cylinders
4. a cylinder, a piston, storage tank and control valve

4. In reaction turbine, draft tube is used

1. to transport water downstream without eddies
2. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
3. for safety of turbine
4. to increase flow rate

5. The efficiency of a centrifugal pump is maximum when its blades are

1. straight
2. bent forward
3. bent backward
4. bent forward first and then backward

6. In centrifugal pumps, maximum efficiency is obtained when the blades are

1. straight
2. bent forward
3. bent backward
4. radial

7. Motion of a liquid in a volute casing of a centrifugal pump is an example of

1. spiral vortex flow.
2. radial
3. forced spiral vortex flow
4. forced cylindrical vortex flow

8. Air vessels in reciprocating pump are used to

1. smoothen flow
2. reduce acceleration to minimum
3. increase pump efficiency
4. save pump from cavitation

9. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

1. same quantity of liquid
2. 0.75 Q
3. Q/0.75
4. 1.5 Q

10. The horse power required in above case will be

1. same
2. 0.75 B.H.P.
3. B.H.P./0.75
4. 1.5 B.H.P.