Question Paper: Mass Transfer Operation - 2 Question Paper - May 2017 - Chemical Engineering (Semester 6) - Mumbai University (MU)
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Total marks: --
Total time: --
INSTRUCTIONS

Mass Transfer Operation - 2 - May 2017

MU Chemical Engineering (Semester 6)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any four question from Q.1(a, b, c, d, e,f)

1(a) Explain the significance of channels of most efficient sections. 5 marks

1(b) How hydraulic jump is classified accroding to Froude number of incoming supercritical flow. 5 marks

1(c) Derive expression for energy loss in hydraulic jump. 5 marks

1(d) What is meant by Magnus effect. 5 marks

1(e) What do you understand by displacement thickness and momentum thickness of boundary layer. 5 marks

1(f) Write design steps in Kennedy's theory of unlined alluvial channels. 5 marks

2(a) A trapezoidal channel to carry 142 m3 min of water is designed to have a minimum cross section find the bottom width and depth if the bottom slope is 1 in 1200, the side slopes at 45° and chezy's constant C = 55. 5 marks

2(b) The discharge of water through a rectangular channel of width 6m is 18m3 when depth of flow of water is 2m. Calculate specific energy of flowing water, critical depth, critical velocity and minimum specific energy. 5 marks

3(a) Derive dynamic equation of gradually varied flow. 5 marks

3(b) A cylinder 1.2m in diameter is rotated about its axis in air having a velocity of 128 km/hr. A lift of 5886N/m length of cylinder is developed in the body. Assuming ideal fluid theory , find the rotational speed and location of stagnation points. Given density of air is equal to 1236 kg/m3. 5 marks

4(a) Determine the thickness of boundary layer at tailing edge of smooth plate of length 4m and of width 1.5m, when the plate is moving with a velocity of 4 m/s in stationary air. Take kinematic viscosity of air as 1.5×10-5 m2/s. Also, determine the total drag on one side of the plate assuming that the boundary layer is laminar over entire length of plate taking density of air 1.226kg/m3 5 marks

4(b) Explain the terms: terminal velocity, circulation, pressure drag, profile drag and friction drag. 5 marks

5(a) Describe method of designing a canal based on Lacey's theory. 5 marks

5(b) Design a channel section by Kennedy's theory, for a given data
Discharge is 28 cumecs
Kutters constant N is 0.0225
Critical velocity ratio is 1
B/D = 7.6
Find also the bed slope of channel
5 marks

6(1) A rectangular channel of width 4m is having bed slope of 1 in 1500. Find the maximum discharge through the channel. Take C = 50. 5 marks

6(2) A circular disc 3m in diameter is held normal to a 26.4 m/s wind of density 0.012 gm/cc. What force is required to hold it at rest. Assume coefficient of drag of disc is 1.1. 5 marks

6(3) Derive conditions for most economical rectangular section. 5 marks

6(4) Write a applications of hydraulic jump. 5 marks

4(a) Explain Wheatstone bridge in detail. 8 marks

4(b) A Platinum resistance thermometer has a resistance of 100Ω at 0°C and the value of temperature coefficient of resistance is 0.00385. In operation the resistance is 101Ω calculate the temperature. 8 marks

Write short notes on

4(c)(i) Layers of protection analysis (LOPA) methods 8 marks

4(c)(ii) Basic Process control scheme with Diagram. 8 marks

5(a) The output of a thermocouple measuring temperatures from 20°C to 180°C is linearly represented by the standard current range of 4-20 mA. Then,
(i) What is the current at 110°C?
(ii) What temperature does a current of 8.4 mA represent?
(iii) What is the current at 130°C?
(iv) What temperature does a current of 10mA.
8 marks

5(b) Explain importance of calibration also explain calibration of Rotameter. 8 marks

5(c) Explain data acquisition and conversion system. 8 marks

Write short notes on (any four)

6(a) Signal conditioning 8 marks

6(b) Capacitive type sensing element 8 marks

6(c) Hot wire anemometer 8 marks

6(d) Piezo electric sensing element 8 marks

6(e) Electromagnetic flow meter. 8 marks