Related Questions

Length to diameter ratio of most rotary driers is in the range of
A 1 to 2
B 4 to 10
C 10 to 20
D 20 to 30
Rotary driers are generally made of
A Cast iron
B Mild steel
C High silicon iron (14% Si)
D Tin lined with refractory bricks
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
The electricity bill of a certain establishment is partially fixed and partially varies as the number of units of electricity consumed. Wen in a certain month 540 units are sonsumed. the bill is TK 1800. In another month 620 units are consumed are the bill is Tk 2040. Inayet another month if 500 units are consumed what would be the bill (in Tk) for that month?
A 1950
B 1560
C 1840
D 1680
HETP is numerically equal to HTU, only when the operating line
A Lies below the equilibrium line
B Lies above the equilibrium line
C And equilibrium lines are parallel
D Is far from the equilibrium line
Paper industry employs __________ driers.
A Cylinder
B Rotary
C Spray
D Fluidised bed
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using
A Liquid extraction
B Distillation
C Evaporation
D Absorption
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes

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