Overall heat transfer co-efficient of a particular tube is U 1 . If the same tube with some dirt deposited on either side has coefficient U 2 , then

Overall heat transfer co-efficient of a particular tube is U 1 . If th

1.	Overall heat transfer co-efficient of a particular tube is U 1 . If the same tube with some dirt deposited on either side has coefficient U 2 , then
A.	U 1 = U 2
B.	U 2 > U 1
C.	U 1 > U 2
D.	U 1 = dirt factor - U 2
Answer» B. U 2 > U 1

Discussion

No Comment Found

Related MCQs

The purpose of providing a \'catchall\' in the vapor line of an evaporator is to
In a trimetric drawing, the relationship of the angle between axes to each other is:
What is the geometric mean of two heat transfer areas A 1 and A 2 ?
In a laboratory test run, the rate of drying was found to be 0.5 x 10 -3 kg/m 2 .s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m 2 /kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U 0 = 400 W/m 2 .K. The fouling factor after one year of operation is found to be h d0 = 2000 W/m 2 .K. The overall heat transfer co-efficient at this time is
Heat transfer co-efficient equation for forced convection, Nu = 0.023 R e 0.8 . P r n , is not valid, if the value of
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45Â°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
Duhring's plot' is of use in
Value of Nusselt number [ Nu = ( hD / k )] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is
The inner wall of a furnace is at a temperature of 700Â°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m -1 .Â°C -1 respectively. The ambient air is at 30Â°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m -2 .Â°C -1 . The rate of heat loss from the outer surface in W.m -2 is

Overall heat transfer co-efficient of a particular tube is U 1 . If the same tube with some dirt deposited on either side has coefficient U 2 , then

Discussion

No Comment Found

Related MCQs

Reply to Comment