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

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 written 10 months ago by aniketbab1 • 0
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