A building has a calculated cooling load of 40 tons, of which 10 tons is latent load. The space is to be maintained at 72 F db and 50 percent relative humidity. Ten percent by volume of the air supplied to the space is outdoor air at 100 F db and 50 percent relative humidity. The air supplied to the space cannot be less that 55 F db. Assume barometric pressure at sea level, and using the Psychrometric analysis software, find: (a) The quantity of air supplied to the space in cfm, (b) The amounts of return air and outdoor air in cfm, (c) The conditions and volume flow rate of the air entering the cooling coil, point 1. (d) The capacity and SHF for the cooling coil

Sketch and describe all the polarization curves obtained from different corrosion behaviours and give one example for each condition

Q.1. Operating torques in analogue instruments are

(a) deflecting and control (b) deflecting and damping (c) deflecting, control and damping (d) vibration and balancing

Q.2. An instrument transformer is used to extend the range of

(a) induction instrument (b) electrostatic instrument (c) moving coil instrument (d) any of the above

Q.3. A power factor meter is based on the principle of

(a) electrostatic instrument (b) Electrodynamometer instrument (c) Electro thermo type instrument (d) Rectifier type instrument.

Q.4.When using the terms "accuracy" and "precision" for measurements

a. "precision" implies less measurement error than "accuracy" b. "accuracy" implies less measurement error than "precision" c. "precision" measures the repeatability of a measurement d. both terms mean the same thing

Q.5. The bridge method commonly used for finding mutual inductance is

(A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

Q.6. The Q-meter works on the principle of

(A) mutual inductance (B) self inductance (C) series resonance (D) parallel resonance

Q.7. A digital-to-analog converter with a full-scale output voltage of 3.5 V has a resolution close to 14 mV. Its bit size is

(A) 4 (B) 8 (C) 16 (D) 32

Q.8.Which of the following has the best accuracy

(A).MI meter (B).Moving coil meter (C).Rectifier type meter (D).Thermocouple meter

Q.9.A 0-10 A ammeter has a guaranteed accuracy of 1% of FSD.The limiting error while reading 2.5A

(A).1% (B).2% (C).4% (D).none of the above

Q.10.In a transducer the observed output deviates from the correct value by constant factor the resulting error is called

(A).Zero Error (B).Sensitivity Error (C).Non-confirmity Error (D).Hysteresis error

Q.11. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

(a) 10° (b) 80° (c) 120° (d) 170°

Q.12. To avoid the effect of stray magnetic field in A.C. bridges we can use

(a) magnetic screening (b) Wagner earthing device (c) wave filters (d) any of the above

Q.13. The disc of an instrument using eddy current damping should be of

(a) conducting and magnetic material (b) non-conducting and magnetic material (c) conducting and non-magnetic material (d) none of the above

Q.14. An induction meter can handle current upto

(a) 10 A (b) 30 A (c) 60 A (d) 100 A

Q.15. Which of the following devices may be used for extending the range of instruments ?

(a) Shunts (b) Multipliers (c) Current transformers (d) Potential transformers (e) All of the above

Imagine you are an automotive engineer for Toyoto Motor Corporation. You are test driving a new cruise control system, and you are driving around the test track at 55 miles per hour. You set the cruise control to 57miles per hour. The cruise controller takes over and speeds up to 59 miles per hour, then slows to 56 miles per hour, and finally settles at 58 miles per hour. Given this result, what adjustments would you make to the car's cruise control system to improve overall performance?  

Q1/Read the following passage carefully:
Assyria was kingdom of northern Mesopotamia that became the center of one of the great empires of the
ancient Middle East. It was located in what is now northern Iraq and southeastern Turkey.
The Assyrians were perhaps most famous for their fearsome army. They were a warrior society where
fighting was a part of life. ... They were known throughout the land as cruel and ruthless warriors. Two
things that made the Assyrians great warriors were their deadly chariots and their iron weapons. Battle of
Nineveh is conventionally dated between 613 and 611 BC, with 612 BC being the most supported date.
Rebelling against the Assyrians, an allied army which combined the forces of Medes and the Babylonians
besieged Nineveh and sacked 750 hectares of what was, at that time, the greatest city in the world.
Assyria was at the height of its power, but persistent difficulties controlling Babylonia would soon
develop into a major conflict. At the end of the seventh century, the Assyrian empire collapsed under the
assault of Babylonians from southern Mesopotamia and Medes, newcomers who were to establish a
kingdom in Iran. The city was destroyed in 612 BCE by a coalition led by Babylonians and Medes which
toppled the Assyrian Empire. Sizable Assyrian populations only remain in Syria, where an estimated
400,000 Assyrians live, and in Iraq, where an estimated 300,000 Assyrians live.
Answer the following questions:
1- What country is Assyria now?
2- What is the Assyrian empire famous for?
3- Who Conquered Assyrian empire?
4- How did Assyrian empire collapse?
5- Do Assyrians still exist?

A homogeneous sphere S, a uniform cylinder C, and a thin pipe P are in contact when they are released from rest on the incline shown. Knowing that all three objects roll without slipping, determine, after 9s of motion, if theta=27 degrees, Find

1. acceleration of sphere down the incline (m/s^2)
2. acceleration of pipe down the incline (m/s^2)
3. The distance between the centers of the cylinder and the sphere (m)
4. Acceleration of cylinder down the incline (m/s^2)
5. the distance between the centers of the pipe and the cylinder (m)

Fill in the given blanks with an appropriate word(s).
1.As a general rule of thumb, a location is considered good for construction of wind turbines if the average wind power density is about - - - - - -
2.The temperature of geothermal water should be - - - - - - for cooling applications for reasonable values of performance factor.

2.In a Lancashire steam boiler, there is a - - - - - - at the end of the fire grate which is utilized in deflecting the flue gases upwards.
4.There are geothermal resources named - - - - - -contain hot liquid water at temperatures up to 450 K and pressures up to 60 MPa.
5.There are fine flat plates in the combustion chamber of a single-ended scotch marine boiler. These plates require - - - - - -
6.The main objective of the - - - - - - is to protect the turbines against the water hammer effect at the time of starting or shutting off the hydroelectric power plant.
7.Based on the furnace position, Cornish boiler is classified as - - - - - -

Steam enters the nozzle of an impulse turbine stage at 60 bar and 500 °C and leaves at 20 bar. Flow is adiabatic and reversible. The nozzle angle is 20°. The moving blade is symmetric, travels at optimum velocity, and assumed to be frictionless. It is also assumed that there is neither expansion nor contraction of the steam flow through the blade passage. Draw the velocity diagram and calculate (a) the blade efficiency and (b) the stage efficiency.

Steel Structures

The rolling process is one of the most frequently used forming processes for producing steel sections. Nonetheless, other forming and fabrication processes can be used to create a range of section shapes in the steel production process. For this assignment, you are required to review the other four types of steel forming/fabricating processes including drawing (manufacturing), extrusion, casting and forging.

Task 1(IN YOUR WORDS) : answer in 250 words)

Review the drawing (manufacturing) process and mention the type of section(s) produced from this process. You should also mention the limitation(s) of this process.

ROUND UP TO 4 DECIMAL PLACES. Draw and label the P-V & T-S diagrams.

Given an ideal air-standard Diesel cycle has a compression ratio of 15. Temperature and Pressure at the start of compression process is 70°F and 1atm. 800 BTU/lbm of Heat is added to the system. Determine (a) Temperature, specific volume and Pressure at each state, (b) Efficiency, and (c) the mass flow rate of air (lbm/min), required to produce 200 hp.

A hot liquid is filled in a spherical tank with an inner diameter of 3 m and a wall thickness of 3 cm. The tank wall is made of a material with a thermal conductivity of 0.15 W/m∙K. The hot liquid in the tank causes the inner surface temperature to be 100°C, while the tank outer surface is exposed to air at 20°C and has an emissivity of 0.35. Determine the outer surface temperature of the tank. Assume that the properties of air can be evaluated at 40°C and 1 atm pressure. Is this a good assumption?

1. What functions are performed by the flutes on a standard twist drill?
2. Basically, what determines what helix angle a drill should have?
3. When a large-diameter hole is to be drilled, why is a smaller diameter hole often drilled first?
4. What is the function of the margins on a twist drill?
5. What are the primary purposes of reaming?
6. What are the purposes of:
a. Spot facing
b. Counterboring
c. Countersinking
7. Suppose you want to drill a 2-in. thick plate of cast steel (0.4%C), 4-in. diameter hole. An indexable HSS insert drill has been selected. Consider the table below, select the appropriate cutting speed, feed rate. Calculate the spindle speed (rpm), the feed rate (in/min), the MRR, and cutting time. Assume the cutting process will be performed in 3 steps using 3 drills sizes in sequence 1”, then 2”, then 4”. Calculate the cutting total cutting time, considering a proper allowance each time.
8. How much time will be required for milling machine to face mill an AISI 1020 steel surface BHN 150, that is 12 in. long and 5 in. wide, using a 6 in. diameter, eight-tooth tungsten carbide inserted-tooth face mill cutter? Select values of feed per tooth and cutting speed from the provided table, Table 24-1.
9. Draw in two sketches the up milling (conventional milling) and down milling (climb cut) machining set up and show the shape of machined material.
10. Why does down milling dull the cutter more rapidly than up milling when machining sand casting iron?

HEAT TRANSFER QUESTION

A shell-and-tube heat exchanger with one shell pass and four tube passes, that contains 190 pipes (thin walled, 4m long, 2.6 cm diameter), will be used to heat the air. Water enters the pipes at 350 K with 8kg/s mass flow rate while the air enters the shell at 15 C with 18kg/s mass flow rate. In time there will be a fouling factor of 0.0026m²K/W on the inside of pipes. Inside heat transfer coefficient is 450 W/m²K, outside heat transfer coefficient is 200 W/m²K. Using the specific heat values for water and air at 25 C.

Find

a)Effectiveness of HX

b) Heat transfer rate (kW)

c) Exit temperatures of air and water, and show one T-L diagram

Consider four identical circular Euler columns under a compressive axial load with a) one end fixed and the other pinned (or hinged or simply-supported), b) both ends fixed, c) both ends pinned (or hinged or simply-supported), d) one end fixed and the other free. What are the buckling loads Pcr for each one and which one is the strongest against buckling? Given are: the length L of the column and bending rigidity EI, ?

What is your understanding on developed, developing and under develop country? Give
an example of each type of the country.