Lakshya Education MCQs

Question: Potential flow is characterised by the
A.Irrotational and frictionless flow
B.Irrotational and frictional flow
C.One in which dissipation of mechanical energy into heat occurs
D.Formation of eddies within the stream
Answer: Option A

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More Questions on This Topic :

Question 1. Multistage centrifugal pumps are generally used for
  1.    High head
  2.    Low head but high discharge
  3.    Highly viscous liquid
  4.    Slurries of high solid concentration
Answer: Option A
Question 2. Remote control valve is a __________ valve.
  1.    Gate
  2.    Butterfly
  3.    Needle
  4.    Globe
Answer: Option B
Question 3. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump
  1.    Develops a lower head
  2.    Capacity is reduced
  3.    Requires more power
  4.    All of the above
Answer: Option D
Question 4. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the new discharge will be __________ litres/minute.
  1.    500
  2.    200
  3.    1000
  4.    750
Answer: Option A
Question 5. Pick out the correct statement.
  1.    Fanning friction factor is inversely proportional to Reynolds number always
  2.    The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed
  3.    Mach number in an incompressible fluid is always unity
  4.    Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow
Answer: Option D
Question 6. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).
  1.    1/D
  2.    1/D²
  3.    1/D⁵
  4.    D²
Answer: Option C

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