logo

CuriousTab

CuriousTab

Discussion

Home ‣ Mechanical Engineering ‣ Hydraulic Machines Comments
  • Question

  • The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is


  • Options
  • A. 24.8 r.p.m.
  • B. 48.2 r.p.m
  • C. 82.4 r.p.m.
  • D. 248 r.p.m

  • Correct Answer
  • 82.4 r.p.m. 

    • Hydraulic Machines problems

    Search Results

    • 1. For centrifugal pump impeller, the maximum value of the vane exit angle is

    • Options
    • A. 10° to 15°
    • B. 15° to 20°
    • C. 20° to 25°
    • D. 25° to 30°
      • Discuss
    • 2. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is

    • Options
    • A.
    • B.
    • C.
    • D. k1+k2
      • Discuss
    • 4. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. The maximum bending moment for the beam shown in the below figure, lies at a distance of __________ from the end B.

    • Options
    • A. l/2
    • B. l/3
    • C.
    • D.
      • Discuss
    • 6. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 7. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 8. The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

    • Options
    • A. product
    • B. difference
    • C. sum
      • Discuss
    • 9. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.

    • Options
    • A. remains same
    • B. increases
    • C. decreases
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.