Correct Answer - Option 3 : 8 m (abs)
In single-acting reciprocating pump , head available at cylinder (H) is given by
H= Hatm – Hsuction head – Hsuction acceleration – Hsuction friction loss
Hatm = 10 m (Given)
HSuction friction loss = Neglected as not given
HSuction head = 1.5 m (Given)
HSuction acceleration = + 3.5 (At beginning of stroke)
HSuction acceleration = - 3.5 (At the end of stroke)
HSuction acceleration = 0 (At mid-stroke)
Case 1:
At beginning of stroke:
H = 10 - 1.5 - 3.5 = 5 m
Case 2:
At end of stroke:
H = 10 - 1.5 - (-3.5) = 8 m
∴ Pressure head at cylinder, considering at the end of stroke is 8 m (absolute).