Engineering Answers

• The electrical load in a small workshop consists of 14 lamps, each rated at 240volt, 60watt and 3 electric fire, each rated at 240, 1kw. What is the effective resistance of the load

• The electrical load in a small workshop consists of 14 lamps, each rated at 240volt, 60watt and 3 electric fire, each rated at 240, 1kw. What is the effective resistance of the load

If 8.5 moles of propylene(gas) reacts completely with hydrogen to form propane(liq). Determine the total heat of reaction(KJ) at 25 oC and 1 atm.

The resistance of a given electric device is 46 ohms at 25 °C. If the temperature coefficient of resistance of the material is 0.004545 at 20°C. What is the temperature of the device when its resistance is 92 ohms?

A golf ball is driven horizontally from an elevated tee with a speed of 25 m/s. It strikes the fairway 2.5 sec later.

(a) How far has it fallen vertically?

(b) How far has it travelled horizontally?

(c) Find the horizontal and vertical components of its velocity just before it strikes the fairway. 

A golf ball is driven horizontally from an elevated tee with a velocity of 27 m/s. It strikes the fairway 2.5 sec later. How far has it fallen horizontally?

Determine the resultant of the system of concurrent forces having the following magnitudes

and passing through the origin and the indicated points: P = 280 lbs, C ( 6, -4, 0 ); T = 520 lbs, B

( -3, -4, 0 ); F = 270 lbs, D ( 4, 6, 0 ). Point A is located at ( 0, 0, 12 )

QUESTION 9

A three- stage amplifier circuit has first stage gain of 45dB, second stage gain of 50dB and 

third stage gain of -5dB. What is the overall gain? If input to the first stage is 0.1mV, what is 

the output of the final stage?

• First, derive the truth table from the statement of the question. (The question must have at least 4 inputs)
• Then, using that truth table, derive the expression in Sum of Minterms form
• Minimize the expression using algebraic manipulation and draw the circuit using conventional gates.
• Then, draw K-Map, and derive the most simplified expression using this technique, after this draw the circuit by using the same simplified expression.
• Then implement the same circuit using NAND gates only.
• Do the same using only NOR gates also.

Finally, please be advised that at least one question must include "Don't Care Conditions

based upon analysis of its organic carbon, hydrogen, oxygen and nitrogen content, the representative empirical formula of C8H17O3N was developed for organic matter in an industrial wastewater, and, from the same analysis, the organic concentration was found to be 18,000 mg/L. For a wastewater flow of 350 m^3/d, what is the daily methane production from the wastewater in m^3 at 35°C and 1 atm and methane percentage in the gas produced if the waste were treated anaerobically? Assume fs is 0.08, the process is 95% efficient at removal of organic matter, and all gases formed evolve to the gas phase.