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
c) Heat leads to expansion
d) Corrosion takes place
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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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