A. directly as fan speed
B. square of fan speed
C. cube of fan speed
D. square root of fan speed
E. none of the above
Related Mcqs:
- According to fan laws, for fans having constant wheel diameter, the pressure varies________________?
A. directly as fan speed
B. square of fan speed
C. cube of fan speed
D. square root of fan speed
E. none of the above - According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?
A. directly as fan speed
B. square of fan speed
C. cube of fan speed
D. square root of fan speed
E. none of the above - According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density - According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density - According to fan laws, at constant pressure, the speed capacity and power vary_________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density - In axial flow fans and turbines, fluid enters and leaves as follows________________?
A. radially, axially
B. axially, radially
C. axially, axially
D. radially, radially
E. combination of axial and radial - In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
A. designing new impeller
B. trimming the impeller size to the required size by machining
C. not possible
D. some other alterations in the impeller
E. none of the above - If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
A. same quantity of liquid
B. 0.75 Q
C. Q/0.75
D. 1.5 Q
E. none of the above - Air vessels in reciprocating pump are used to__________________?
A. smoothen flow
B. reduce acceleration to minimum
C. increase pump efficiency
D. save pump from cavitation
E. increase pump head - Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
A. 39.2%
B. 49.2%
C. 68.8%
D. 84.8%
E. 91.6%.
