6571. Interstage coolers are provided in a multistage compressor to
Save power in compressing a given volume to a given pressure
Cool the delivered air
Achieve the exact delivery pressure
None of these
✅ The correct answer is option A.
Chemical Engineering
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6572. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?
0.5
1
1.5
2
✅ The correct answer is option A.
6573. Which of the following conditions must be satisfied for lift force to be developed?
The body should be bluff body
The body should be stream lined
Circulation around the body is essentially required
The main stream velocity must approach the velocity of sound in that fluid medium
✅ The correct answer is option C.
6574. Plunger pumps are used for
Higher pressure
Slurries
Viscous mass
None of these
✅ The correct answer is option A.
6575. While starting a centrifugal pump, its delivery valve should be kept
Opened
Closed
Either opened or closed ; it does not make any difference
Either opened or closed; depending on the fluid viscosity
✅ The correct answer is option B.
6576. Stoke’s equation is valid in the Reynolds number range
0.01 to 0.1
0.1 to 2
2 to 10
10 to 100
✅ The correct answer is option A.
6577. Purpose of relief valve in a reciprocating pump is to
Protect the pump against developing excessive pressure
Facilitate unidirectional flow of liquid
Reduce the discharge pressure
Control the rate of discharge
✅ The correct answer is option A.
6578. The capacity of a centrifugal pump Can be increased by increasing the
Impeller diameter or speed
Number of pumps and joining them in series
Number of pumps and joining them in parallel
All of the above
✅ The correct answer is option D.
6579. In parallel pipe problems, the
Head loss is the same through each pipe
Discharge is the same through all the pipes
Total head loss is equal to the sum of the head losses through each pipe
None of these
✅ The correct answer is option A.
6580. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number
160
120
80
40
✅ The correct answer is option D.