Month: March 2019

A. Is economical in operation
B. Employs high velocity, high heat transfer rate and less heating surface requirement
C. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to
tube bundle
D. Both B. & C.

A. Drain the liquid from the tray when the unit is not in operation
B. Allow for thermal expansion and facilitate installation
C. Avoid back-trapg
D. None of these

A. Temperature
B. Pressure/pressure fluctuation
C. Turbulence
D. Noise

A. Less than
B. More than
C. Same as
D. Either more or less (depending upon relative volatility

A. Heat transfer between corrosive fluids
B. Cases where temperature difference between the shell and the tubes is more (>50°C)
C. Co-current heat transfer systems
D. Counter-current heat transfer systems

A. 0.55
B. 0.75
C. 0.85
D. 0.95

A. Aa = Sa
B. 1.2 Aa = 1.2 Sa
C. Sa = 1.5 Aa
D. Aa = 1.5 Sa

A. Very large diameter pipes
B. High pressure throttling service
C. Very accurate flow control
D. Smaller sizes of pipe

A. Leads to high tray efficiency
B. Results in higher pressure drop per tray
C. Both A. & B.
D. Neither A. or B.

A. ζh = 2 ζL
B. ζh = ζL
C. ζh = ζL/2
D. No relation exists