The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations. 44055 3.5 to 7.0 0.3 to 0.8 1.25 to 3.125 TRUE ANSWER : ? YOUR ANSWER : ?
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is (d1 + d2)/d1 D2/(d1 + d2) D1/(d1 + d2) (d1 + d2)/d2 TRUE ANSWER : ? YOUR ANSWER : ?
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the Smaller reactor should come first None of these Larger reactor should come first Equal sized reactors are the best TRUE ANSWER : ? YOUR ANSWER : ?
Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is About 0.33 times About 3 times Same Less TRUE ANSWER : ? YOUR ANSWER : ?
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by 4(0.86p² - πd²)/πd 4(0.86p² - πd²/4)/πd (p² - πd²/4)/πd (4p² - πd²/4)/πd TRUE ANSWER : ? YOUR ANSWER : ?
Pick out the wrong statement about the design of a sieve plate column. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns TRUE ANSWER : ? YOUR ANSWER : ?
In case of design of a shell and tube heat exchanger, Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch All of these Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres TRUE ANSWER : ? YOUR ANSWER : ?
Ratio of tube length to shell diameter for a shell and tube heat exchanger is < 4 : 1 for gas-gas exchangers 4 : 1 to 8 : 1 for liquid-liquid exchanger Both B & C 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger? Disk and doughnut baffle 75% cut segmental baffle Orifice baffle 25% cut segmental baffle TRUE ANSWER : ? YOUR ANSWER : ?
Floating head heat exchangers are used for the Heat transfer between corrosive fluids Co-current heat transfer systems Cases where temperature difference between the shell and the tubes is more (>50°C) Counter-current heat transfer systems TRUE ANSWER : ? YOUR ANSWER : ?