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Water is pumped to a height of 150 m at a rate of 300 litres per minute. The efficiencies of the pump and the 200 V driving motor are 73 % and 82 % respectively.
Determine:
The current of the motor
The cost of running the motor for 14 hours per day (Note: 1kWh cost 35c)
A dc shunt motor after running for several hours on constant mains of 350 V takes a field current of 1,6 A. If the temperature rise is known to be 40°C, what value of extra circuit resistance is required to adjust the field current to 1,6 A when starting from cold at 20°C?
The temperature coefficient of the motor’s armature material is 0,0043/K at 20°C.
Prove that for closed thermodynamic system, change of energy of the system is
independent of path, it is function of state only.
Internal energy of certain thermodynamic system is given by 𝑢 = 25 + 0.25𝑇 where T
is temperature in ℃. When the system execute a process, work done per degree
temperature change is given by 𝑑𝑊
𝑑𝑇
= 350√𝑇 N-m, find the heat transferred when the
temperature changes from 100℃ 𝑡𝑜 200℃.
discuss and outline How previous and current government policies/ incentives affect property investment in the Uk in general and in London particularly
Discuss Who the low of supply and demand affects the housing market within the Uk in general?
6. A throttling calorimeter is connected to the superheated steam line supplying steam to the auxiliary feed pump on a ship. The line pressure measures 2.5 Mpa. The calorimeter pressure is 110 kpa and 150oC. Determine the entropy of the steam line. Please detailed the solution and answer.
2. Two pulleys 10 in. diameter and 25 in. diameter is connected by an open belt with center distance of 40 in. Find the belt length needed to connect them.
Please answer with detailed solution.
The link lengths for the four-bar linkage are given in the figure. In the
position shown, coupler link 2 is subjected to force F2 of magnitude
47 N at an angle of 1320, and follower link 3 is subjected to force F3
of magnitude 30 N at an angle of 1280. Determine the shaft torque T1
on input link I and the bearing loads for static equilibrium.
GIVEN:
l1=30mm; l2=100mm; l3=50mm.
"\\phi1 = 135 degree , \\phi2=17 degree, \\phi3=85 degree\n."
r1=0, r2=45mm, r3=38mm.
O1O3 = 70mm, O1B=30mm, BC=100mm, O3B=50mm.
(Answer ASAP. I wish I could attach the figure!)
Twenty Post-Practical Questions - SSl Time Response [20]
1) Derive the equation for the unit step response of a first order low-pass system.
2) Derive the equation for the unit step response of a second order low-pass system.
3) Explain how you would measure the time constant of a first order system.
4) Explain how you would find the steady state gain of a first order system from the differential equation and by measurement.
5) Derive the formulas for time to peak and % overshoot of an underdamped second order system.
6) Explain how you would measure the damping ratio of a second order system.
7) Explain how you would set initial condition in Matlab Simulink.
8) Explain the pin-out of a μ741 op amp.
9) Why can a μ741 be regarded as having infinite gain?
10) Why can a μ741 be regarded as having infinite input resistance.
