Question73:-Stream lines, streak lines and path lines are identical for a
A:-Steady flow
B:-Unsteady flow
C:-Incompressible flow
D:-Never identical
Correct Answer:- Option-A
Question74:-The material acceleration is always zero for a/an
A:-Steady and uniform flow
B:-Steady and non-uniform flow
C:-Unsteady and uniform flow
D:-Unsteady and non-uniform flow
Correct Answer:- Option-A

Question75:-The separation of the boundary layer takes place when the pressure
gradient is

A:-Negative

B:-Constant

C:-Positive

D:-Zero

Correct Answer:- Option-C

Question76:-When an air vessel is fitted to a single acting reciprocating pump the
% of saving in work done against friction is

A:-84.8%

B:-39.2%

C:-50%

D:-100%

Correct Answer:- Option-A

Question77:-Two pumps can operate independently at heads 7,2, and discharges
2,0, respectively. If the pumps are connected in parallel, then what are the resulting
discharge (Q) and head (H)

‎घा = घ 2001102‏ = 8 - :يلم

‏و©+ ,9 - 8:9 +8 -8-: 8

‏ي©-,9 - 11:9 +8 - 8 -: 0

‎87... 1.೭...

‎Correct Answer:- Option-A

‎Question78:-The overall efficiency of a centrifugal pump when head is 25 m,
discharge is 0.004 m/s and output power P is 16 kW(g = 10 m/:2, o=1000 KQ/m3)

‎A:-65%