6131. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a
Pitot tube
Manometer
Rotameter
None of these
✅ The correct answer is option A.
Chemical Engineering
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6132. Centrifugal pumps as compared to reciprocating pumps
Run at a lower speed for the same discharge
Do not need priming
Deliver fluid with pulsating/fluctuating discharge
Can be run with discharge line valve closed for a short interval
✅ The correct answer is option D.
6133. The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.
Newtonion
Pseudoplastic
Dilatent
Bingham plastic
✅ The correct answer is option B.
6134. Two piping system are said to be equivalent, when the __________ are same.
Fluid flow rate & friction loss
Length & friction factor
Diameter & friction factor
Length & diameter
✅ The correct answer is option A.
6135. The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation
dq/dx = K
dq/dx = K.q
dq/dx = K/q
dq/dx = Kq²
✅ The correct answer is option A.
6136. Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
< 0.3
> 3
50
1
✅ The correct answer is option A.
6137. A centrifugal pump loses prime after starting. The reason of this trouble may be
Incomplete priming
Too high a suction lift
Low available NPSH and air leaks in the suction pipe
All of the above
✅ The correct answer is option D.
6138. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its
Absolute viscosity
Ratio of absolute viscosity to density
Density
Reynolds number
✅ The correct answer is option B.
6139. An ideal nozzle design aims at
Minimising wall friction
Suppressing boundary layer separation
Both A & B
Neither A nor B
✅ The correct answer is option C.
6140. Slugging in a fluidised bed can be avoided by using
Tall narrow vessel
Deep bed of solids
Shallow beds of solids and proper choice of particle size
Very large particles
✅ The correct answer is option C.