81
Maintenance cost of a __________ pump for a particular duty is the least.
A)
Centrifugal
B)
Reciprocating
C)
Volute
D)
Gear
Answer & Solution
Answer: Option
A
82
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).
A)
Increase
B)
Decrease
C)
Remain constant
D)
Either A or B; depends on other factors
Answer & Solution
Answer: Option
A
83
Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'
A)
d
B)
0.5d
C)
2d
D)
4d
Answer & Solution
Answer: Option
B
84
I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch
A)
4.728
B)
0.5
C)
0.622
D)
0.474
Answer & Solution
Answer: Option
C
85
The valve commonly used in pipes larger than 2" dia is a
A)
Globe valve
B)
Plug-cock
C)
Gate valve
D)
Check valve
Answer & Solution
Answer: Option
C
86
If in a flow field, between any two points, then the flow must be
A)
Steady, incompressible, irrotational
B)
Steady, compressible, irrotational
C)
Steady, compressible and along a streamline
D)
Unsteady, incompressible, irrotational
Answer & Solution
Answer: Option
A
87
Which of the following factors does not contribute to the pressure drop in a pipeline ?
A)
Velocity of fluid
B)
Size of pipe
C)
Length of pipe and number of bends
D)
None of these
Answer & Solution
Answer: Option
D
88
A piezometer provided in the pipe measures
A)
Friction factor
B)
Static pressure
C)
Dynamic pressure
D)
None of these
Answer & Solution
Answer: Option
B
89
Air vessel of a reciprocating pump is initially filled with
A)
Atmospheric air
B)
Compressed air
C)
Water
D)
None of these
Answer & Solution
Answer: Option
B
90
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is
A)
4(Ro - Ri )
B)
$$\sqrt {{{\text{R}}_{\text{o}}} - {{\text{R}}_{\text{i}}}} $$
C)
2(Ro - Ri )
D)
Ro + Ri
Answer & Solution
Answer: Option
C
