Practice Test: Question Set - 12
1. Which of the following pump is successfully used for lifting water from deep wells?
- (A) Centrifugal
pump
- (B) Reciprocating
pump
- (C) Jet pump
- (D) Air
lift pump
2. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be
- (A) Horizontal
- (B) Nearly horizontal
- (C) Steep
- (D) First rise and then
fall
3. The overall efficiency for a Pelton wheel lies between
- (A) 0.50 to 0.65
- (B) 0.65 to 0.75
- (C) 0.75 to 0.85
- (D) 0.85 to 0.90
4. The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)
- (A) (W/p) × (A/a)
- (B) (p/W) × (a/A)
- (C) (W/p) × (a/A)
- (D) (p/W) × (A/a)
5. In a centrifugal pump casing, the flow of water leaving the
- (A) Radial
- (B) Axial
- (C) Centrifugal
- (D) Vortex
6. The unit discharge through the turbine is
- (A) Q/√H
- (B) Q/H
- (C) Q/H3/2
- (D) Q/H²
7. If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
- (A) H = Hg/hf
- (B) H = Hg
× hf
- (C) H = Hg
+ hf
- (D) H = Hg
- hf
8. Manometric head, in case of a centrifugal pump, is equal to
- (A) Suction lift
+ Loss of head in suction pipe due to friction + Delivery lift + Loss of head
in delivery pipe due to friction + Velocity head in the delivery pipe
- (B) Work-done
per kN of water Losses within the impeller
- (C) Energy
per kN at outlet of impeller Energy per kN at inlet of impeller
- (D) All
of the above
9. In a Francis turbine runner, the numbers of blades are generally between
- (A) 2 to 4
- (B) 4 to 8
- (C) 8 to 16
- (D) 16 to 24
10. The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is
- (A) ηh = ηo × Î·m
- (B) ηm = ηm × Î·h
- (C) ηo = ηh × Î·m
- (D) None
of these
11. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.
- (A) Hydraulic
- (B) Mechanical
- (C) Overall
- (D) None
of these
12. The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is
- (A) [wa (V - v)]/2g
- (B) [wa (V - v)]/g
- (C) [wa (V - v)²]/2g
- (D) [wa (V - v²)]/g
13. The number of buckets on the periphery of a Pelton wheel is given by
- (A) (D/2d)
+ 5
- (B) (D/2d)
+ 10
- (C) (D/2d)
+ 15
- (D) (D/2d)
+ 20
14. The cavitation in a hydraulic machine
- (A) Causes
noise and vibration of various parts
- (B) Reduces
the discharge of a turbine
- (C) Causes
sudden drop in power output and efficiency
- (D) All
of the above
15. Geometric similarity is said to exist between the model and the prototype, if both of them
- (A) Have
identical velocities
- (B) Are
equal in size and shape
- (C) Are
identical in shape, but differ only in size
- (D) Have
identical forces
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