Engineering Answers

Question 1 1.1. Use EASYEDA to Design the following electrical circuit, and determiner the voltage across resistor 1 to resistor 5. (7) 1.2. From 1.1 one use EASEDA to design the equivalent circuit and measure the voltage across the R equivalent. (3) [10] Question 2 2.1. Use EASYEDA to Design the following electrical circuit in figure 2, and determiner the voltage across resistor 1 to resistor 6. (7) 2.2. From 2.1 one use EASYEDA to design the simplified circuit and measure the voltage across the R total. (3) [10]

In a heat exchanger shown in Figure 3, the cold water stream receives 10,382 kcal/h of heat from the hot water stream(pink color). At the inlet (Point 1), the cold stream is at a temperature of 29^oC and Psat. The outlet (Point 2) of the cold stream is 700 cm below the inlet. You can assume that there were no other heat losses due to friction. If the volumetric flow rate of the cold water stream is 825 L/hr, calculate the specific enthalpy(KJ/kg) of the cold-water stream at Point 2. 

Input the final answer(value only) correct to 2 decimal places.

Take the density of the cold-water stream as 998 Kg/m³

QUESTION 3 Figure 2 depicts the schematic diagram of a phase shift oscillator . Figure 2 Phase shift oscillator for Question 3 The circuit will oscillate if it is designed to have poles on the jv-axis. 3.1Show that the transfer function for the passive network in the circuit is given by 𝑉2(𝑠) 𝑉1(𝑠) = −1 (1 + 1 𝑠𝑅𝐶) (2 + 1 𝑠𝑅𝐶) 2 − 3 − 2 𝑠𝑅𝐶 (10) 3.2Show that the oscillator’s characteristic equation is given by 1 − 𝐾 1 (1 + 1 𝑠𝑅𝐶) (2 + 1 𝑠𝑅𝐶) 2 − 3 − 2 𝑠𝑅𝐶 = 0 (10) [20]

Using the CPA, the Deepwater Co. was able to determine that the expected completion time for the construction of a racing yacht was 1 year 9 months and the project variance was 4 months. Find the probability that the project would be completed in (a) 17 months (b) 20months (hint: state your assumptions clearly) 

Activities Duration (Days) Finish drainage under house 3 Finish brick work below d.p.c. 1 Finish electrical main laying under the house 2 Complete drains 3 Complete external main laying 2 Laying external pavement 2 Install internal services 4 Fill with sand 1 Draw an AoN network for the above situation, inserting all relevant information on the network and appropriately marking the critical path.

An air core circular coil has 5000 turns. The inner and outer diameters are 20 and 24 cm

respectively. If a current of 2A is passed through the coil, determine the flux density inside the coil.

A boiler consumes 16,800 pounds of feul/hr when producing 210,000

lb of steam per hour at 620 psia and 800 deg F from feed water at

650 psia and 800F from feed water at 650 psia and 300F. The

heating value of fuel is 18,500 Btu/lb and the furnace volume is 1250

ft. Calculate: a) boiler capacity in mb/hr ; b) factor of evaporation ; c) equivalent evaporation ; d) furnace heat-release rate in Btu/hr-ft^3 ; e) boiler efficiency