A. Smaller than
B. Larger than
C. Same as
D. Twice
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Related Mcqs:
- The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec?
A. 1.8
B. 12.4
C. 186.2
D. 736.4 - A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
A. 10 m
B. 11 m
C. 11.8 m
D. 30 m - Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?
A. 0.42
B. 0.62
C. 0.82
D. 0.98 - The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?
A. 160
B. 120
C. 80
D. 40 - Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its________________?
A. Inner diameter
B. Outer diameter
C. Thickness
D. Neither inner nor outer diameter - The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge) ?
A. Q1/Q2
B. Q2/Q1
C. (Q2 – Q1)/Q1
D. (Q2 – Q1)/Q2 - 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. - A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?
A. Increase
B. Decrease
C. Remain same
D. Data insufficient to predict - A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?
A. Develops a lower head
B. Capacity is reduced
C. Requires more power
D. All A., B. and C. - The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet ?
A. P, Q and R
B. P and R
C. R and S
D. P, Rand S
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