Engineering Answers

Find the values of the flags (carry ,sign ,zero, overflow) of the processor status register for the given

example of two 8 bit no’s in Hex (A7 + EF) and draw the circuit diagram also.

 8.) An air blower is to deliver 40,000 ft3/min. Two U-tube gages measure suction and discharge pressures. The suction gage reads a negative 2′′ of water. The discharge gage, located 3 ft above the point to which the suction gage is attached, reads +3′′ of water. The discharge and suction ducts are of equal diameter. What size motor should be used to drive the blower if the overall efficiency is 68% (γ = 0.0750 lb/ft3 for air)?

5.) Oil of specific gravity 0.750 is pumped from a tank over a hill through a 24′′ pipe with the pressure at the top of the hill maintained at 25.5 psi. The summit is 250 ft above the surface of the oil in the tank, and oil is pumped at the rate of 22.0 cfs. If the lost head from tank to summit is 15.7 ft, what horsepower must the pump supply to the liquid? 

6.) Compute the lost head in a 150-mm pipe if it is necessary to maintain a pressure of 231 kPa at a point upstream and 1.83 m below where the pipe discharges water into the atmosphere at the rate of 0.0556 m /s. 

7.) Water is pumped from reservoir A at elevation 750.0' to reservoir E at elevation 800.0' through a 12′′ pipeline. The pressure in the 12′′ pipe at point D, at elevation 650.0', is 80.0 psi. The lost heads are: A to pump suction B = 2.0 ft, pump discharge C to D = 38V2 /2g, and D to E = 40V2 /2g. Find discharge Q and horsepower supplied by pump BC.

1.)  A 300-mm pipe carries oil of sp gr 0.812 at a rate of 0.111 m /s, and the pressure at a point A is 18.4 kPa gage. If point A is 1.89 m above the datum plane, calculate the energy at A.

2.) Water flows upward in a vertical 300-mm pipe at the rate of 0.222 m /s. At point A in the pipe the pressure is 210 kPa. At B, 4.57 m above A, the diameter is 600 mm, and the lost head A to B equals 1.83 m. Determine the pressure at B.

3.) A 12′′ pipe line carries oil of specific gravity 0.811 at a velocity of 80.0 ft/sec. At points A and B, measurements of pressure and elevation were 52.6 psi and 100.0 ft and 42.0 psi and 110.0 ft, respectively. For steady flow, find the lost head between A and B. 

4.) A reservoir supplies water to a horizontal 6′′ pipe 800 ft long. The pipe flows full and discharges into the atmosphere at the rate of 2.23 cfs. What is the pressure in psi midway in the pipe, assuming the only lost head is 6.20 ft in each 100 ft of length? 

Explain the difference between an isothermal and an adiabatic expansion of a gas .

20020 m ^ 3 the gas in question 7 at a pressure of 1 bar is compressed to 70020 m ^ 3 adiabatic change . Calculate the:

a) ratio of the specific heat capacities y

b) final pressure

Explain briefly why a gas has two specific heat capacities.

0.28 kg of a gas is heated from 29 °C to 68°C. The specific heat capacity of the gas at constant volume is Cv = 0.72 kJ/kgK and the specific heat capacity at constant pressure Cp =1.01 kJ/kgK Calculate the change in:

a) Enthalpy

b)Internal energy

c) Flow energy

An air compressor works with a compression ratio 6:1 . If the incoming air is at a pressure of 1 bar and temperature of 20 degrees °C , calculate the final air pressure if the final temperature is 68 °C . Note : 1bar = 100 * 10 ^ 3 * Pa

A simple hydraulic jack has a pump piston diameter 38.13 mm , and a load piston 190.65 mm . Calculate:

a) the effort force needed to lift a load of 1300 Newton

b) The distance moved by the load if the effort moves a distance 285

A manometer is used to measure the gas pressure supply to a boiler. One side is connected to the supply and the other is open to the atmosphere . The manometer contains water (density 1000 kg/m^ 3 ). Calculate the gauge pressure if the head is 560 mm. How would you find the absolute pressure of the gas supply?

A journal runs in a bearing diameter , 25mm , and length 100 mm at 25 . The clearance gap is 0.8 mm . The lubricant used has a dynamic viscosity of 80 CP . The bearing must carry a side load of 800N . Calculate the values of:

a) the friction force

b) coefficient of friction

Note : 1cP = 1mPa - s