A multi-disc wet clutch is to transmit 120 Nm of torque at 1000 rpm using sintered friction material.

(i) Assuming uniform wear, find the outside and inside diameters required if ri = 0.577ro.

(ii) What is the power transmitted?

(iii) Using the diameters found in (i), determine the power transmitted when the clutch is new.

For a 1DOF system, how many natural frequency (frequencies) does it have? How many vibration(s) could it possibly have?

Select the best answer for the question. 7. Which one of the following statements about diesel engines is true? A. The temperature of the fuel in a diesel engine has an effect on the power output. B. Diesel engines deliver usable torque through a much wider rpm range than gasoline engines. C. Diesel engines run quieter than gasoline engines. D. Acceleration is faster with a diesel engine compared to a gasoline engine.

A seamless blank unstayed dished head with pressure on the concave side has a diameter of 1,016mm and is a segment of a sphere with a dish radius of 889 mm, The thickness of the dished head is 25.4mm. The maximum allowable stress value of dished- head material (carbon steel, SA- 285- A) is 88.9 MPa, which has an operating temperature of no more than 250 C. Determine the maximum allowable working pressure of the blank unstayed dished head.

The following data collected from a steam turbine of 25 MW capacity thermal power plant:

Assume R for air as 287 kJ/kg C

Steam condensed = 40000 kh/hr

Temperaure of steam in condenser =40 degree

Dryness of steam enetring condenser = 0.85

Air leakage in the condenser = 140 kg/hr

Temperature of codenser =35 degree

Temperature at the suction of air pump = 32 degree

Borometer reading = 76 cm of Hg

Maximum rise in cooling water temperature =12 degree

Find : 1. Vacuum gauge reading in condenser , 2.Capacity of dry air pump in cume meter per hour 3.Quantity of cooling water passes through condenser in tons per hour

8. Consider a potato being baked in an oven that is maintained at a constant temperature. The temperature of the potato is observed to rise by 5°C during the first minute. What will be the temperature rise during the second minute? A. Less than 5°C B. More than 5°C C. Equal to 5°C D. No temperature rise

explain the difference between a saturated and an unsaturated carbon-containing molecule.

A single stage steam turbine is supplied with steam at 5 bars, 200 C at the rate of 50kgmin. It exhausts into a condenser at a pressure of 0.2 bars. The blade speed is 400msec. Nozzles are inclined at an angle of 20 to the plane of the wheel and outlet blade angle 30. Neglecting friction losses, the power developed by the turbine will be?

assume that the data are stored in variable names x and y. write a matlab code to plot the quadratic spline and along with the data points

x= 1 2 3 4 5 6
y= 40 78 125 256 348 425

Please calculate the air consumption rate below in litre/sec

The forge contains one large pneumatically operated hammer driven by 1 double acting cylinder, piston rod at one end only, bore 400mm, piston rod diameter 100mm, stroke 680mm. The piston executes 9 up strokes and 9 down strokes in 1.5 minutes then does nothing for 3.5 minutes, then repeats the cycle. The air is regulated to enter at 590 kPa.g. and in this machine the pressure in the cylinder may be taken to be this for the full stroke.

As a body is projected to a high altitude above the earths surface, the variation of the acceleration of gravity with respect to altitude y must be taken into account. Neglecting air resistance, this acceleration is determined from the formula a=?g0[R2/(R+y)2], where g0 = 9.81 m/s2 is the constant gravitational acceleration at sea level, R = 6356 km is the radius of the earth, and the positive direction is measured upward.

Part A

With what velocity does the particle strike the earth if it is released from rest at an altitude y0 = 800 km?
Express your answer using three significant figures and include the appropriate units

v =

7-7 Consider the same compressor as problems 7-5 and 7-6. Calculate the rate of entropy generation (in kW/K) of the real compressor.

Solutions:

Problem 7-1 & 7-2

7-1 Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum work (in kW) required? Use the right sign convention for work. Hint: The minimum work is that of the reversible process. Start by simplifying the entropy balance!

Ans: W = -75.92

7-2 Consider the same situation as problem 7-1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum outlet temperature (in°C) required? Hint: just like before, the minimum outlet temperature occurs when the process is reversible.

Ans: T2 = 47

7-5 You build the compressor from Participation Problems 7-1 and 7-2 and find that the exit temperature is actually 60°C. If the real compressor is still adiabatic, what is the real work (in kW) ? Use the right sign convention for work.

Ans: -105.38

7-6 Consider the same compressor from Participation Problems 7-5 with a real exit temperature of 60°C. What is the efficiency (expressed as a %) of the compressor?

Ans: 71.4

Only need 7-7

if a horizontal heated plate is divided up into sections, starting from the leading edge, which section would experience the greatest amount of heat transfer ?