For the production of very high vacuum, a _____________ pump is normally used?

Related Mcqs:

1. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?

   A. 10 m
   B. 11 m
   C. 11.8 m
   D. 30 m

2. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?

   A. Increase
   B. Decrease
   C. Remain same
   D. Data insufficient to predict

3. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?

   A. Develops a lower head
   B. Capacity is reduced
   C. Requires more power
   D. All A., B. and C.

4. High specific speed of a pump implies that, it is a/an _____________ pump?

   A. Centrifugal
   B. Mixed flow
   C. Axial flow
   D. None of these

5. For the transfer of solution of thick slurry, the pump used is a _____________ pump?

   A. Reciprocating
   B. Gear
   C. Diaphragm
   D. Centrifugal

6. Centrifugal pump can’t be used to pump _____________________?

   A. Molten sodium (used as a coolant in Fast Breeder Reactor)
   B. Moderately viscous vegetable oil used in soap industry
   C. Thick molten soap at 80°C
   D. None of the above

7. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?

   A. Axial
   B. Radial
   C. Mixed
   D. None of these

8. A centrifugal pump is called a turbine pump, if it is having a_________________?

   A. Turbine type impeller
   B. Vaned diffusion casing
   C. Rotating vaned volute
   D. None of these

9. Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump?

   A. Reciprocating
   B. Plunger
   C. Electromagnetic
   D. Gear

10. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?

    A. Head
    B. Discharge
    C. Efficiency
    D. None of these