Specifications

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4. Velocity imparted by the impeller to the water is converted to pressure by the
A) Casing or volute B) Stuffing box C) Spindle D) Gland box
5. Maximum suction lift that is possible for water is
A) 24 ft B) 28 ft C) 34 ft D) 38 ft
6. Packing ropes in a centrifugal motor is water lubricated and water cooled, so
A) only wet packing ropes to be used B) water should be leaking near the
packing ropes
C) motor should never run dry D) lubricating compound should be used
for packing ropes.
7. To ensure that the pump remains always primed it is necessary to have
A) valve on delivery side should be open B) suction side should not have
always any valve
C) foot valve that is not leaking D) gland packing should not be leaking.
8. When using automatic operation of the pump, it should be ensured that
A) water level is always above the foot valve B) delivery valve is closed at the time of
starting
C) suction side is not less than 20 ft. D) water level is always below the foot
value.
9. Pressure developed by the centrifugal pump is always specified in
A) feet B) feet/min C) litres D) kg/cm
2
10. Static suction head and static delivery head is always
A) feet B) Kg/cm
2
C) vertical height D) distance measured
along the pipes
Part - B
Answer the following questions in one or two words (1 Mark)
1. Name the part on which impeller is mounted?
2. What is packing rope made of?
3. Which type of bearings is normally used in domestic pumps?
4. In the centrifugal pump, kinetic energy of fluid is converted to which type of energy?
5. Which parts of motor take part in this energy conversion?
6. A pump cannot pull or suck a liquid up because liquids do not have this strength. What is it?
7. A centrifugal should not be started without doing this. What is that?