821.
In a reciprocating pump, air vessels are used to
A
Reduce the acceleration head
B
Reduce the flow
C
Increase the delivery head
D
Smoothen the flow
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In a reciprocating pump, air vessels are used to
Reduce the acceleration head
Reduce the flow
Increase the delivery head
Smoothen the flow
The horse power required in above case will be
1.5 B.H.P.
same
0.75 B.H.P.
B.H.P./0.75
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge
1.5 Q
same quantity of liquid
0.75 Q
Q/0.75
Air vessels in reciprocating pump are used to
save pump from cavitation
smoothen flow
reduce acceleration to minimum
increase pump efficiency
Motion of a liquid in a volute casing of a centrifugal pump is an example of
forced cylindrical vortex flow
spiral vortex flow.
radial
forced spiral vortex flow
In centrifugal pumps, maximum efficiency is obtained when the blades are
radial
straight
bent forward
bent backward
The efficiency of a centrifugal pump is maximum when its blades are
bent forward first and then backward
straight
bent forward
bent backward
In reaction turbine, draft tube is used
to increase flow rate
to transport water downstream without eddies
to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
for safety of turbine
A hydraulic intensifier normally consists of
a cylinder, a piston, storage tank and control valve
two cylinders, two rams and a storage device
a cylinder and a ram
two co-axial rams and two cylinders
A hydraulic accumulator normally consists of
a cylinder, a piston, storage tank and control valve
two cylinders, two rams and a storage device
a cylinder and a ram
two co-axial rams and two cylinders
Maximum impulse will be developed in hydraulic ram when
ram chamber is large
waste valve closes suddenly
supply pipe is long
supply pipe is short
Which of the following type of gear has inclined teeth?
Spur gear
Helical gear
Spiral gear
All of the above
Which of the following pressure angle (in degrees) is commonly used for gears?
15
20
25
30
Which of the following operation is different from the rest
Rivetting
Embossing
Punching
Coining
Which of the following methods produces gear by generating process
Hobbing
Casting
Punching
Milling
Which of the following is a gear finishing operation
Milling
Hobbing
Shaping
Shaping and brushing
Which of the following is a form of teeth?
Cycloidal
Spherical
Helical
All of the above
Which gear is used if the axes of two shafts are neither intersecting nor parallel?
Hypoid gears
Worm gears
Both a and b
None of the above
What are the advantages of smaller pressure angles?
High radial force
High separating force
High contact ratio
All of the above
To connect two intersecting shafts we use
Spur gear
Helical gear
Worm and wheel
Bevel gears