Fluid Mechanics problems
- 1. If the discharge of a centrifugal pump is throttled, then its suction lift
Options- A. increases
- B. decreases
- C. remains unchanged
- D. data insufficient to predict Discuss
Correct Answer: increases
- 2. Most commonly used joint in the underground pipe lines is the
Options- A. sleevejoint
- B. coupling
- C. flange
- D. expansion joint Discuss
Correct Answer: sleevejoint
- 3. Co-efficient of velocity is __________ the coefficient of discharge.
Options- A. less than
- B. more than
- C. equal to
- D. not related to Discuss
Correct Answer: more than
- 4. Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
Options- A. flow rate
- B. mean velocity
- C. both 'a' & 'b'
- D. neither 'a' nor 'b' Discuss
Correct Answer: mean velocity
- 5. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s).
Options- A. 24000
- B. 24
- C. 0.24
- D. 0.44 Discuss
Correct Answer: 0.44
- 6. The velocity profile for turbulent flow through a closed conduit is
Options- A. logarithmic
- B. parabolic
- C. hyperbolic
- D. linear Discuss
Correct Answer: logarithmic
- 7. The pitot static tube does not measure the __________ pressure.
Options- A. static
- B. total
- C. difference in static & dynamic
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 8. The resistance wire used in a hot wire anemometer for conducting electrical current is made of
Options- A. copper
- B. tungsten
- C. chromium
- D. aluminium Discuss
Correct Answer: tungsten
- 9. What is the normal range of exit cone angle of a venturimeter?
Options- A. 2 to 5
- B. 7 to 15
- C. 15 to 25
- D. >25 Discuss
Correct Answer: 7 to 15
- 10. Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.
Options- A. 40
- B. 34
- C. 8
- D. 37 Discuss
Correct Answer: 8
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