Thermodynamics and Marks Dissertation

HERIOT WATTS UNIVERSITY

INSTITUTION OF ENGINEERING AND PHYSICAL SCIENCES

DEGREE OF BENG IN MECHANICAL ENGINEERING

First Yr

Mechanical Architectural Science several

?? day?? June 2007??:?? –??:??

Answer TWO questions coming from each section A & B.

Section A

Q1. a) For a Newtonian substance state an expression for the shear stress. [4 marks]

b) An glaciers hockey puck traverses ice on a slender sheet of water. A puck minted by an ice handbags player At first travels for a acceleration of twenty m/sec, the thin coating of normal water between the puck and the glaciers has a fullness of zero. 2 logistik calculate the shear tension if the viscosity of the drinking water is zero. 0018 kg/m sec. [8 marks]

A puck has an approximate diameter of 80 mm, calculate the initial move force around the puck. [5 marks]

c) In the figures under the viscosity being a function of temperature can be graphed for two fluids, Smooth A and Fluid W; given zero other information, discover which liquid is a liquid and the gas. Rationalize your answer.

Fluid A Fluid N [pic]

[pic]

Figure Q1

[8 marks]

.

Q2. Figure Q2a shows a mercury manometer, (mercury s. g. =13. 6) attached to a pipeline transporting olive oil (oil t. g. =0. 85), the other arm of the manometer is confronted with the atmosphere. What is the absolute pressure inside the pipeline? [pic]

Figure Q2a

[10 marks]

Another mercury manometer is connected to two oil sewerlines (oil s. g. =0. 85) branded A and B, since shown under in Figure Q2b. Calculate the pressure difference pB-pA.

[pic]

Figure Q2b

[10 marks]

Imagine a pressure gauge was fitted to canal A and it assessed a pressure of 2 pub. What might the absolute pressure in pipe B be? Give your response in pub. [5 marks]

Q3. a)A hot air balloon contains a volume of you, 000 m3(1 thousand m3). Taking the around air denseness to be 1 ) 21 kg/m3 calculate the buoyancy force. [5 marks]

Taking the pressure and temp of the hot air to be you bar and 200oC respectively calculate the mass of hot air (Specific gas continuous R=287 J/kg K)? [5 marks]

In case the balloon and basket have a mass of 75 kg combined and a typical passenger contains a mass of 70 kilogram, how many people can easily ride in the balloon? [8 marks]

b) A great experimental style boat has become constructed by a team of young technical engineers and it is found to be unstable. A number of suggestions are manufactured improve the vessels stability that most involve attaching buoyancy supports (blocks of polystyrene) for the outside of the sevyloyr fish hunter 360, see the physique below.

[pic]

Figure Q3

Of the 3 configurations rank them to be able of most stable to least stable. Justify your rating. [7marks]

Section B. as well as

Section M

Q4. With a draw on a photo voltaic diagram, describe the processes which in turn occur in the cylinder of any 4-stroke, spark-ignition engine during its operation. [10 marks]

An engine evaluation was carried out on a 6 cylinder four stroke engine with a total swept amount of 3000cm3. The subsequent data had been obtained:

Sign diagram

Duration (x axis on the sign diagram)160mm

Springtime constant75kN/m2 per mm

Net diagram area1600mm2

Engine speed2500 rev/min

Torque170Nm

Calculate:

a) the indicated work during 1 cyclefor 1 cylinder [5 marks] b) the mentioned power output of the engine [4 marks] c) the brake electrical power output of the engine [2 marks] d) the brake pedal specific energy consumption in kg/(kW h) if 150 cm3 of fuel is definitely consumed within a 1 tiny test (fuel density sama dengan 750 kg/m3) [4 marks]

Q5. (a) Coal fuelled power plant to get generating electrical energy uses steam/water in a pattern. Name the thermodynamic products in the cycle and show the way they are linked together. [5 marks]

A power plant can burn 0. a few metric loads of fossil fuel in an hour and in that point produces 6000 MJ of...

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