Question

Slip of a reciprocating pump is defined as
A. Difference of theoretical discharge and actual discharge.
B. Ratio of actual discharge to theoretical discharge.
C. Ratio of theoretical discharge to actual discharge.
D. None

Answer 1

Hint: Bernoulli’s equation is the base for fluid mechanics and it is used to manufacture several machines. Machines like pump and diffuser are vastly used in the mechanical industry in order to extract the desired characteristics from the fluid flowing through them. Just like a centrifugal pump, a reciprocating pump is used to transfer the liquid.

Complete step by step answer:
Reciprocating pump, the name itself gives us the hint how it works. Just like the vehicle engine it also has the piston and various strokes. But this pump operates exactly opposite to the engine. If we consider a two stroke cylinder in older bikes, initially after starting the crank shaft will rotate and the rotary motion of the crankshaft is converted to the translatory motion of the connected rod and it is converted to the reciprocating motion of the piston. In suction stroke the fuel sucked in and ion compression stroke the fuel will get ignited and the power will be generated and transferred to wheels.
In case of reciprocating pumps, working of everything is the same but output is opposite. Here the crankshaft is rotated when connected to the power source and connecting rod is translated and the piston is open wide and vacuum created so that water is sucked inside. Then in the compression stroke the piston compresses the fluid and the discharge valve opens and fluid gets discharged.
Now the theoretical value of discharge is different from actual discharge.
That difference is called the slip of the reciprocating pump.
Hence option A is the answer.

Note:
It doesn’t matter about the type of pump we use. It may be centrifugal or reciprocal. The sole purpose of the pump is to transfer fluid from lower heights to upper heights. The kinetic energy of the fluid will be converted to the pressure energy and is discharged at high pressures to reach heights.