Hydraulic Machines-Fluid Machineries - Set 09 - ObjectiveBooks

# Practice Test: Question Set - 09

1. In a Kaplan 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

2. The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet.
(A) Equal to
(B) 1.2 times
(C) 1.8 times
(D) Double

3. An impulse turbine is used for
(D) High discharge

4. If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is
(A) (V­1 - V2) / V1
(B) (V­1² - V2²) / V1²
(C) V1 / (V1 - V2)
(D) V1² / (V1² - V2²)

5. A Pelton wheel is
(A) Tangential flow impulse turbine
(B) Inward flow impulse turbine
(C) Outward flow impulse turbine
(D) Inward flow reaction turbine

6. Delivery head of a centrifugal pump is
(A) Directly proportional to N
(B) Inversely proportional to N
(C) Directly proportional to
(D) Inversely proportional to

7. Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters)
(A) wQHs
(B) wQHd
(C) wQ (Hs - Hd)
(D) wQ (Hs + Hd)

8. Slip of a reciprocating pump is negative, when
(A) Suction pipe is short and pump is running at low speeds
(B) Delivery pipe is long and pump is running at high speeds
(C) Suction pipe is short and delivery pipe is long and the pump is running at low speeds
(D) Suction pipe is long and delivery pipe is short and the pump is running at high speeds

9. The Fourneyron turbine is _________ reaction turbine.
(A) An axial flow
(B) An inward flow
(C) An outward flow
(D) A mixed flow

10. Braking jet in an impulse turbine is used
(A) To break the jet of water
(B) To bring the runner to rest in a short time
(C) To change the direction of runner
(D) None of these

11. Which of the following pump is successfully used for lifting water to the boilers?
(A) Centrifugal pump
(B) Reciprocating pump
(C) Jet pump
(D) Airlift pump

12. The Thomson's turbine is _________ reaction turbine.
(A) An axial flow
(B) An inward flow
(C) An outward flow
(D) A mixed flow

13. The static head of a centrifugal pump is equal to the _________ of suction head and delivery head.
(A) Product
(B) Difference
(C) Sum
(D) None of these

14. The hydraulic efficiency of an impulse turbine is the
(A) Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
(B) Ratio of the actual work available at the turbine to the energy imparted to the wheel
(C) Ratio of the work done on the wheel to the energy of the jet
(D) None of the above

15. The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by
(A) 2V/(vr - v)
(B) 2V/(vr + v)
(C) V/(vr - v)
(D) V/(vr + v)

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