Mechanical Engineering Answers

1. A 0.75-m^3 rigid tank initially contains air whose density is 1.18 kg/m^3. The tank is connected to a high- pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m^3. Determine the mass of air that has entered the tank.

2. A desktop computer is to be cooled by a fan whose flow rate is 0.40 m^3/min. Determine the mass flow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m^3. Also, if the average velocity of air is not to exceed 110 m/min, determine the minimum diameter of the casing of the fan.

A shipment of 7 television sets contains 2 defective sets A hotel makes a random purchase of 3 of the sets: a) If x is the number of defective sets purchased by the hotel, find the probability distribution of x Express the results graphically as a probability histogram. b) Find the cumulative distribution function of the random variable X representing the number of defectives. Then using flx), find (a) p(X = 1); (b) p(O < X s 2).

Using the method of joints, calculate the force in each member of the trusses shown. State whether each member is in tension or compression. Note that the truss geometry is symmetric. E 8 ft A B D IC QIQI 6 ft 8 ft 2000 lb -6ft- 1200 lb

Determine the chebyshev spacing for the function y = x 1.5 for the range 1≤ X ≤4 and specify three precision position using graphical approach only. Also determine the values of ɸ And y. assume θ S = 30ᶿ and ɸ s=90ᶿ and Δ θ = Δ ɸ = 90ᶿ

Determine the chebyshev spacing for function y = log 10 X for the range 1≤ X ≤10 where three precision positions are required . Determine θ 2 , θ 3 and θ 2 , θ 3 if 45ᶿ is starting position and 105ᶿ is finishing position of input link and 135ᶿ is starting position and 225ᶿ is finishing position of output link.

A four bar mechanism is used to generate the function Y= 1/x for the range 1≤ X ≤3. Find the three precision positions from chebyshev spacing. If the initial values for the crank angle and follower angle is 30◦ and 200◦ respectively.

Take Δ θ=Δ ɸ 90ᶿ. Find the corresponding values of θ And ɸ

Task 5 

Investigate the information flow through the company which you work for and evaluate its effectiveness. This will involve meeting with people within the factory and finding out how they fit into the communication chain. You need to home in on a particular product or activity which is being carried out. There a number of options open to you, for example: 

• Follow through the sequence of events which take place when a product is ordered, manufactured, tested and subsequently despatched 

or 

• Investigate what happens if a product goes faulty in service and a customer contacts the company help desk  

or 

• Find out what happens when a manager decides to purchase and install a new machining centre (or similar piece of capital) equipment in the workshop. 

P

horizontal cylindrical tank filled with liquid but we dont know it height of liquid so how we find out and how we calculate volm of liquid only we know about length or diameter of cylinder

Assume 2 kg of hydrogen (Item B 28) are initially at 40 atm, 100 K. (a) If the hydrogen changes pressure to 1 atm without a change of temperature, find the changes of enthalpy and entropy. (b) If the hydrogen changes temperature to 35 K with no change of entropy, find the change of pressure and enthalpy.

In a single slider crank mechanism, the length of crank and connecting rod are

125 mm and 500 mm respectively. The crank speed is 600 RPM Clockwise.

When the crank has turned 45° from the inner dead centre position, determine

the velocity of the slider