1)Name 4 physical phenomena that light can have on some devices, so these devices can be used as light sensor.

2)What is the LDR sensor and what is the effect of light on this device?

3)What is the main difference in structure of PIN Photodiode and standard PN photodiode (photovoltaic cell)? What is the advantage of PIN over PN?

4) Which kind of sensors, is the characteristics of the PIN photodiode similar to?

5) If we increase voltage in a bulb, its temperature rises due to two reasons. Mention these two reasons.

In a line to line fault and in a double line to ground fault, how can I calculate voltages: V1, V2, Vo and Va,Vb, Vc. Write formulas please!

a) Water makes life possible. The cells of your body could not function without water in which to dissolve essential biological molecules. What electrical properties of water make it such a good solvent? b) When a credit card is “swiped” through a card reader, the information coded in a magnetic pattern on a back of the card is transmitted to the card holder’s bank. Why? Is it necessary to swipe the card rather than holding it motionless in card reader slot? Which of the Maxwell’s equation explains how a credit card reader works? c) Is it possible to have a purely electric wave propagate through empty space which is a wave made up of an electric field but no magnetic field? What about purely magnetic wave, with a magnetic field but no electric field? Please explain your answer by using Maxwell’s equation concept

A star-connected induction motor has the following rated parameters: Voltage UN = 400 V, current IN = 8 A, frequency fN = 50 Hz, speed nN = 1480 rpm, power factor cos ijN = 0.8, efficiency ȘN = 0.9, magnetizing inductance Lm = 280 mH, stator leakage inductance LVı = 9 mH and rotor leakage inductance LUı = 14 mH.

For the rated operating point of the motor, calculate the per-unit values for electric active power Pel, mechanical power Pmech, magnetizing inductance Lm, stator leakage inductance LVı, rotor leakage inductance LUı, slip s, and the mechanical torque Tmech. Calculate the motor rated power and rated torque (the actual kW and Nm values) using the per-unit values.

Question #1

a) What is the major difference between a 4:1 MUX (multiplexer) and a 2:4
decoder?
b) How many binary inputs would be needed for a decoder with 32
mutually-exclusive outputs? Please explain why.
c) A data acquisition system has only one analog-to-digital (A/D) converter.
You have 12 different analog inputs to select. Which of the following
would you choose?
1) 8:1 MUX
2) 4:16 decoder
3) 16:1 MUX
4) 3:8 decoder
Please explain why.

A 50 ohm transmission line has an unknown load impedance ZL. A voltage maximum occurs at z = -0.15(wavelength). At z = -0.20(wavelength) the real part of the impedance is 30 ohms. Find ZL using the Smith chart.

a-) Provide information about coding techniques used in communication systems.

b-) Explain the reasons and uses of the coding.

For the integration of distributed generation with utility provide the different methods of integration at least 3 (plz type your answer)?

Draw the pin configuration of timer 555 and describe the monostable operation of it.

a) Calculate the electric field of a point P on the perpendicular bisector of a dipole. Also calculate the potential difference from infinity of the point. Also make a sketch of the equipotential lines and the electric field lines. b) Explain what happens if we put a large point charge Q at that point P.

1. three-phase induction motor rated 250 hp, 0.7 pf and 80% efficiency. Determine the minimum size in kVAR of a capacitor needed to prevent overloading the transformers.Two single-phase transformers each rated 150 kVA are connected open delta supplying a

2. A 2.2 kV, 200 hp, delta- connected, 3 phase synchronous motor is operating on full load at an efficiency of 0.88 and pf of 0.8 leading. The armature has a reactance per phase of 5 ohms and negligible resistance. Solve the induced emf per phase.

3.The result of the no load test on a three phase wye connected induction motor are as follows: line to line voltage = 400 V; Input power = 1770 W; Input current = 18.5 A; friction and windage loss = 600 W. determine the magnetizing reactance per phase.

1.Evaluate (1 + a) / (1 + a^2)

2. A generator having a solidly grounded neutral and rated 50 MVA, 30 kV has a positive, negative and zero sequence reactances of 20, 20 and 5 percent respectively. What reactance must be place in the generator neutral to limit the fault current or a bolted single line to ground fault to that for a bolted three phase fault?

3. The positive, negative and zero sequence reactances of a 15 MVA, 11 kV three-phase wyeconnected generator are 11%, 8% and 3% respectively. The neutral of the generator is grounded and is excited to the rated voltage on open circuit. A line to ground fault occurs on phase a of the generator. Calculate the fault current.

Design a 4 to 1 demultiplexer with 2 select inputs B and A, 4 data inputs (D3 to D0), and an output Y. You can use MultiSim with just basic gates (AND, OR, NOT, NAND, NOR, XOR), VHDL, or LabVIEW.

please I will need screenshots for the circuit and successful completion of the simulation. Thanks!