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  • Question

  • If the pump head is 75 m, discharge is 0.464 m3/s and the motor speed is 1440 rpm at rated condition, the specific speed of the pump is about


  • Options
  • A. 4
  • B. 26
  • C. 38
  • D. 1440

  • Correct Answer
  • 38 

    • GATE Exam Questions problems

    Search Results

    • 1. Bituminous materials are used in highway construction primarily because of their :

    • Options
    • A. cementing and water-proofing properties
    • B. load bearing capacity
    • C. high specific gravity
    • D. black colour which facilitates road markings
      • Discuss
    • 2. The comparison between pumps operating in series and in parallel is :

    • Options
    • A. Pumps operating in series boost the discharge, whereas pumps operating in parallel boost the head.
    • B. Pumps operating in parallel boost the discharge, whereas pumps operating in series boost the head.
    • C. In both cases there would be a boost in discharge only.
    • D. In both cases there would be a boost in head only.
      • Discuss
    • 3. A soil mass has coefficients of horizontal and vertical permeability as 9 x 10-7 cm/s and 4 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equivalent isotropic soil mass is

    • Options
    • A. 9 x 10-7 cm/s
    • B. 4 x 10-7 cm/s
    • C. 13 x 10-7 cm/s
    • D. 6 x 10-7 cm/s
      • Discuss
    • 4. The shape of the STOP sign according to IRC:67-2001 is

    • Options
    • A. circular
    • B. triangular
    • C. octagonal
    • D. rectangular
      • Discuss
    • 5. Water flows at a depth of 0.1 m with a velocity of 6 m/s in a rectangular channel. The alternate dpeth is

    • Options
    • A. 0.30 m
    • B. 0.40 m
    • C. 0.86 m
    • D. 0.81 m
      • Discuss
    • 6. In cohesive soils the depth of tension crack (Zcr) is likely to be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The parameters in Horton's infiltration equation are given as, fo = 7.62 cm/hour, fc = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is

    • Options
    • A. 2.68 cm
    • B. 1.50 cm
    • C. 1.34 cm
    • D. 4.18 cm
      • Discuss
    • 8. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

    • Options
    • A. 2.0
    • B. 1.63
    • C. 1.00
    • D. 0.61
      • Discuss
    • 9. The temporary hardness of water, is caused by:

    • Options
    • A. dissolved carbondioxide
    • B. bicarbonates and carbonates of calcium and magnesium
    • C. bicarbonates of sodium and potassium
    • D. carbonates of calucium and magnesium
      • Discuss
    • 10. The expression for the specific speed of a pump :

    • Options
    • A. does not include the diameter of the impeller
    • B. yields larger values for radial pumps than for axial flow pump
    • C. is necessarily non dimensional
    • D. includes power as one of the variables
      • Discuss

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