1
GATE ME 1991
+1
-0.3
In shell and tube heat exchanger, baffles are mainly used to
A
Increase the mixing of fluid
B
Increase the heat transfer area
C
deflect the flow in desired direction
D
Reduce fouling of the tube surface .
2
GATE ME 1991
Subjective
+5
-0
A one shell pass, one tube-pass heat exchanger, has counter flow configuration between the shell side and tube side fluids. The total number of tubes within the heat exchanger is $$10$$ and the tube dimensions are $$ID=10$$ $$mm,$$ $$OD=12$$ $$mm$$ and length $$=1m.$$ saturated dry steam enters the shell side at a flow rate of $$2$$ $$kg/s$$ and the temp of $${100^ \circ }C.$$ In the tube side, cold water enters at a flow rate of $$10$$ $$kg/s$$ with an inlet temp of $${25^ \circ }C.$$ The $$OHTC$$ based on the outer surface area of the tubes is $$50$$ $$W/{m^2}K.$$ The specific heat of water is $$4.18$$ $$kJ/kg$$-$$K$$ and the latent heat of steam is $$2500$$ $$kJ/kg.$$ What is the condition of the steam at the exit.
3
GATE ME 1991
+2
-0.6
When the annual demand of a product is $$24000$$ units, the $$EOQ$$ (Economic Order Quantity) is $$2000$$ units. If the annual demand is $$48000$$ units the most appropriate $$EOQ$$ will be
A
$$1000$$ units
B
$$2000$$ units
C
$$2800$$ units
D
$$4000$$ units
4
GATE ME 1991
+1
-0.3
Strength to weight ratio for a circuit shaft transmitting power is directly proportional to the
A
square root of the diameter
B
diameter
C
square of the diameter
D
cube of the diameter
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