In case of centrifugal fan or blower, the gas capacity varies as __________________?

Related Mcqs:

1. The pressure and power requirement of a gas fan at constant speed & capacity varies ____________ the gas density?

   A. Directly as
   B. Inversely as square root of
   C. Inversely as
   D. As square of

2. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?

   A. Directly as square of gas density
   B. Directly as gas density
   C. Directly as square root of gas density
   D. Inversely as gas density

3. Power requirement of fans having constant wheel diameter varies _____________ fan speed?

   A. As square of
   B. Directly as
   C. As cube of
   D. None of these

4. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?

   A. NPSH required
   B. BHP required by the pump
   C. Head of the liquid pumped
   D. All A., B. and C.

5. The speed of sound in an ideal gas varies as the __________________?

   A. Temperature
   B. Pressure
   C. Density
   D. None of these

6. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure?

   A. Increase
   B. Decrease
   C. Not change
   D. Exponentially decrease

7. The capacity of a centrifugal pump Can be increased by increasing the_________________?

   A. Impeller diameter or speed
   B. Number of pumps and joining them in series
   C. Number of pumps and joining them in parallel
   D. All A., B. and C.

8. Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively_______________?

   A. Efficiency, head and B.H.P.
   B. Head, efficiency and B.H.P.
   C. B.H.P., efficiency and head
   D. Efficiency, B.H.P. and head

9. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?

   A. Newtonian
   B. Dilatant
   C. Pseudo-plastic

   D. Non-Newtonian

10. The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid?

    A. Newtonian
    B. Pseudo-plastic
    C. Dilatent
    D. Bingham plastic