Pumps in Series Operation Quiz

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What is one major problem when dissimilar pumps are arranged in series?

The smaller pump may be forced to operate beyond its free delivery flow rate. (correct)
The volume flow rate through each pump varies significantly.
Each pump operates at the same pressure rise.
The power supplied to the smaller pump is maximized.

Why might the smaller pump in a series arrangement act like a head loss?

It has a higher pressure rise capability than the larger pump.
It operates at lower efficiency levels than the larger pump.
It is unable to handle the large head imposed on it. (correct)
Its performance curve differs greatly from the larger pump.

What happens if two very dissimilar pumps are connected in series?

Problems may arise due to mismatched performance curves. (correct)
The net volume flow rate increases significantly.
The power consumption decreases compared to parallel connection.
They operate at maximum efficiency.

When centrifugal pumps are connected in series, what is the relationship between the discharge of one pump and the suction side of the second pump?

The discharge is connected to the suction side. (C) Signup and view all the answers

What could happen if dissimilar pumps in a parallel arrangement are not sized properly?

The smaller pump may not handle the large head imposed on it. (B) Signup and view all the answers

In what scenario would connecting similar pumps in series or parallel be more suitable?

When minimizing wasted power is important. (A) Signup and view all the answers

What is the result of connecting two pumps in series?

The resultant head is the sum of the individual heads (C) Signup and view all the answers

What must be ensured about the casing of the second pump in a series connection?

It must be strong enough to resist higher pressure (C) Signup and view all the answers

Why should you start the second pump after the first pump is running in a series connection?

To ensure both pumps are filled with liquid (C) Signup and view all the answers

What happens to the head when two identical pumps are arranged in series?

The head is twice the head of a single pump at the same flow rate (A) Signup and view all the answers

Where does the combined head and flow rate move when two pumps are connected in series?

Along the system curve to a new point (B) Signup and view all the answers

What is required to overcome larger system head loss than one pump can handle alone?

Centrifugal pumps in series (D) Signup and view all the answers

What is the relationship between the head for each pump when two pumps with equal performance curves are running in series?

The head for each pump equals half the head at point 3. (B) Signup and view all the answers

Why are multistage centrifugal pumps more often used than single stage pumps when operating in series?

Multistage pumps deliver higher energy and are more suitable for series operation. (D) Signup and view all the answers

How is the water head added by a centrifugal pump typically measured?

By calculating the difference in heads at the pump's inlet and outlet. (D) Signup and view all the answers

What is the formula for calculating the water head added by a centrifugal pump?

$Hp = pd - ps vd^2 - vs^2 + (zd - zs) \gamma/2g$ (B) Signup and view all the answers

What does the combined/equivalent head formula represent for n pumps connected in series?

The sum of all individual pump heads in series. (D) Signup and view all the answers

How does the combined/equivalent flowrate (QE) for n pumps connected in Series compare to that of an individual pump?

$QE = n * Q1$ (B) Signup and view all the answers