### Determine the quantity of air the fan must provide

Assignment Help Mechanical Engineering
##### Reference no: EM132280174

Questions -

Q1. An exhaust ventilation system is shown in Figure below. The head losses given are based on the assigned air quantities, and the shaft dimensions are 10 x 7.5 ft (3.05 x 2.29 m). Determine the quantity of air the fan must provide. Locate regulators where needed, specifying the amount of regulation at each. Find the mine heads and the air power.

Q2. In the exhaust ventilation system shown in the following figure, determine all of the missing quantities for individual segments of airway; locate regulators where needed and calculate the amount of regulation needed. Determine the static head for each of the two fans. Also, determine the size of the regulator to be placed across the heading containing Q12.

Q3. A temperature survey of a mine is made to investigate the natural ventilation. The data obtained are indicated in the figure below. The friction factor is 100 x 10-10 lb.min2/ft4 (0.01855 kg/m3), all airways are 10 x 10 ft (3.05 x 3.05 m), and the elevation of the collar of the higher shaft is 5000 ft (1524 m). Disregarding the shock losses and the velocity head, compute the natural ventilation head, and the quantity of flow and air power on the basis of the most reliable calculated head. Indicate the direction of flow and sketch the characteristic curve of the system.

Q4. The following data are obtained during a test of a vane-axial mine fan:

 Static Head in. (kPa) Quantity cfm ( m3/s) Power Input Bhp (kW) 8.00 (1.99) 0          (0) 37.6 (28.0) 7.65 (1.90) 5,000   (2.36) 35.5 (26.5) 6.00 (1.49) 12,500 (5.90) 24.0 (17.9) 6.65 (1.65) 16,000 (7.55) 25.5 (19.0) 6.10 (1.52) 20,000 (9.44) 25.0 (18.6) 3.70 (0.92) 25,000 (11.80) 21.0 (15.7) 0        (0) 28,600 (13.50) 13.0 (9.7)

The fan has a diameter of 38 in. (965 mm) and a speed of 1750 rpm, and the air specific weight is 0.075 lb/ft3 (1.20 kg/m3). Plot characteristic curves of the fan for quantity versus static and total heads, power input, static and total air power, and static and total efficiency. Tabulate all data used in plotting curves.

#### Determine the resultant couple moment vector

A structure is fixed to a surface at point O and supports 300 and 400 N couples as shown. Determine the resultant couple moment vector, using both scalar and vector approach

#### Determine whether or not the block will slide

A 150 lb block rests on a horizontal floor. The coefficient of friction between the block and the floor is 0.30. A pull of 40 lb, acting upward at an angle of 30° to the hor

#### Design a p1d velocity controller for the system

Design a PID velocity controller for the system. The angular velocity of output shaft should be controllable in the range -3000 to 3000 RPM. Clearly describe and document th

#### What will be extension of the spring at a rotational speed

A body of mass 1 kg is whirled in a horizontal plane at the end of a spring. The spring stiff ness is 5 kN m 1 and the initial distance from the centre of rotation to the ce

#### What is the bulk modulus k for the aluminum

It is also known that the normal strains in the x and y directions are x= 713.8 × 10-6 (elongation) and y = - 502.3 × 10-6 (shortening). What is the bulk modulus K for the a

#### Compute the corrosion penetration rate

Using the results of Problem 17.13, compute the  corrosion  penetration  rate,  in  mpy,  for the corrosion of iron in HCl (to form Fe2 + ions)   if   the   corrosion   curr

#### Calculate the maximum continuous rating of the boiler

For preliminary calculations it is assumed that the actual cycle will have an efficiency ratio of 70% and that the generator mechanical and electrical efficiency is 95%. Cal

#### Determine the convection heat transfer co-efficient

If the bottom surface of the slab is 20 C and the metal foil has an emissivity of 0.02, determine the convection heat transfer co-efficient if the air is flowing over the met