# Hydraulic Machines Questions and Answers – Slip of Reciprocating Pump

This set of Hydraulic Machines Question Bank focuses on “Slip of Reciprocating Pump”.

1. Internal breakage in a pump mainly takes place when ________
a) Discharge pressure is increased
b) Temperature is increased
d) Corrosion takes place

Explanation: Internal breakage in a pump mainly takes place when the discharge pressure in the pump is increased in between that of the piston rings and the cylinder liner or the leading internal valves.

2. During internal breakage, output power ________
a) Increases
b) Decreases
c) Remains same
d) Independent

Explanation: During internal breakage, output power decreases. This is an important measure to determine the volumetric efficiency of the pump.

3. The output that we get after an internal breakage can be classed as _________
a) An increase
b) A decrease
c) Constant
d) An independent variable

Explanation: The output that we get after an internal breakage can be classed as an independent variable. During internal breakage, output power decreases. This is an important measure to determine the volumetric efficiency of the pump.

4. When the hydraulic fluid forms on only one side of the piston, it is called _______
a) Single acting pump
b) Double acting pump
c) Froth pump
d) Draft tube

Explanation: When the hydraulic fluid forms on only one side of the piston, it is called a single acting pump.

5. The speed of the reciprocating pump is generally measured in ______
a) Stokes.min
b) Stokes/min
c) rps
d) rp/s

Explanation: The speed of the reciprocating pump is generally measured in stokes/min. This is the number of times the piston moves backward and forth in one minute. It can also be measured in rpm.

6. A pump with two steams and two water cylinders is called ________
a) Single acting pump
b) Double acting pump
c) Froth pump
d) Duplex pump

Explanation: A pump with two steams and two water cylinders is called duplex pumps. It consists of a basic hydraulic system layout.

7. Reciprocating pumps can deliver fluid at high pressure.
a) True
b) False

Explanation: Reciprocating pumps can deliver fluid at high pressure. It can do it with its high delivery head. This is one of the major advantage of reciprocating pumps.

8. When an external force is not available in a pump, we use a ________
a) Hydraulic cylinder
b) Slip gauge
c) Tail race
d) Heater

Explanation: When an external force is not available in a pump, we use a hydraulic cylinder attached at the port end.

9. Piston pumps are self priming.
a) True
b) False

Explanation: The statement is true. Piston pumps are self priming. They do not need cylinders to be filled before the starting of the operation. This is one of the major advantage of the piston pumps.

10. Reciprocating pumps give a ________ flow
a) Uniform
b) Non- uniform
c) Pulsating
d) Sinusoidal

Explanation: Reciprocating pumps give a pulsating flow. Reciprocating pumps can deliver fluid at high pressure. It can do it with its high delivery head. This is one of the major advantage of reciprocating pumps.

11. Suction stroke becomes difficult to pump ______
a) High temperature fluids
b) Viscous fluids
c) Fluids with abrasives
d) High velocity fluids

Explanation: For a good condition of the pump, the slip should be below 1 percent. Suction stroke becomes difficult to pump when the fluid is of high viscosity.

12. Piston pumps are very _______
a) Expensive
b) Cheap
c) Reasonable
d) Intricate

Explanation: The piston pumps are very expensive because of their accurate sizes of the cylinders and their pistons. Also, they require a conversion of their gearing that involves extra equipment cost.

13. What is the full form of DAC?
a) Digital Acting pumps
b) Double acting pumps
c) Data acting pumps
d) Draft tube pumps

Explanation: DAC stands for Double acting pumps. Suction stroke becomes difficult to pump when the fluid is of high viscosity in a double acting pump.

14. Which among the following is not a multi-cylinder pump?
a) Double acting simplex
b) Single acting duplex
c) Double acting duplex
d) Single acting triplex

Explanation: Double acting simplex is not a multi-cylinder pump. It is a single cylinder pump. The more the double acting cylinders in a pump, the smoother the operation is providing a better output.

15. As the motor rotates the flywheel, the eccentrically mounted connecting rod rotates with it.
a) True
b) False

Explanation: As the motor rotates the flywheel, the eccentrically mounted connecting rod rotates with it. The other end of the connecting rod is coupled to the slide assembly or the cross head gear.

Sanfoundry Global Education & Learning Series – Hydraulic Machines.

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