# Fluid Mechanics & Thermal Sciences [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering]: Questions 74 - 76 of 77

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## Question 74

Appeared in Year: *2021*

### Question

Numeric Answer▾A shell and tube heat exchanger is used as a steam condenser. Coolant water enters the tube at 300 K at a rate of 100 kg/s. The overall heat transfer coefficient is 1500 W/. and total heat transfer area is 400 m Steam condenses at a saturation temperature of 350 K. Assume that the specific heat of coolant water is 4000 J/kg. K. The temperature of the coolant water coming out of the condenser is ________ K (round off to the nearest integer) .

## Question 75

Appeared in Year: *2021*

### Question

Numeric Answer▾Consider the open feed water heater (FWH) shown in the figure given below:

Specific enthalpy of steam at location 2 is 2624 kJ/kg. specific enthalpy of water at location 5 is 226.7 kJ/kg and specific enthalpy of saturated water at location 6 is 708.6 kJ/kg. If the mass flow rate of water entering the open feed water heater (at location 5) is 100 kg/s then the mass flow rate of steam at location 2 will be kg/s (round off to one decimal place) .

## Question 76

Appeared in Year: *2019*

### Question

Numeric Answer▾If one mole of gas occupies a rigid container with a capacity of 1000 litres and the temperature is raised from to , the change in pressure of the contained gas (round off to two decimal places) , assuming ideal gas behaviour, is ________ Pa. (R = 8.314 J/mol. K)