Which of the following is not the function of a volute casing provided in a centrifugal pump ?

Related Mcqs:

1. The _________________ of a double acting reciprocating pump as compared to the single acting pump will be almost double ?

   A. Flow output
   B. Head developed
   C. Overall efficiency
   D. Weight

2. Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?

   A. Freon
   B. Liquid sulphur dioxide
   C. Methyl chloride
   D. Ammonia

3. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?

   A. T1/(T1-T2)
   B. T2/(T1-T2)
   C. T1/T2
   D. T2/R1

4. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

   A. TR/(T2 – TR) × (T1 – T2)/T1
   B. TR/(T2 – TR) × T1/(T1 – T2)
   C. TR/(T1 – TR) × (T1 – T2)/T1
   D. None of these

5. Baffles are provided in heat exchangers to____________?

   A. Remove dirt
   B. Increase heat transfer rate
   C. Reduce vibrations
   D. Reduce heat transfer rate

   Submitted by: Faheem Zaman Dhaunroo

6. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

   A. Temperature only
   B. Temperature and pressure only
   C. Temperature, pressure and liquid composition xi only
   D. Temperature, pressure, liquid composition xi and vapour composition yi

7. For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?

   A. Internal energy
   B. Enthalpy
   C. Entropy
   D. All (A), B. & (C)

8. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?

   A. T
   B. T and P
   C. T, P and Z
   D. T and Z

9. Free energy change of mixing two liquid substances is a function of the__________________?

   A. Concentration of the constituents only
   B. Quantities of the constituents only
   C. Temperature only
   D. All A, B. and C

10. Which is a state function ?

    A. Specific volume
    B. Work
    C. Pressure
    D. Temperature