TECH8015 - Lab4_Manual-MS-Word_Version

. Design and Simulate circuit in figure 3 using Multisim software and get the following parameters  Ic =……………………. IL = …………………… ISource =…………………… VL = …………………… VC = …………………… VR = ……………………

Give a brief introduction about the topic of generation and measurement of direct current voltage...(if possible for 2 pg or 1 pg) high voltage engineering subject..

Discuss the importance of voltage regulation in power systems.

In a rectifier circuit , DC output voltage and RMS output voltage is  0.3 V & 0.49 V respectively. The form factor of this circuit is ___________________.    a. 1.63 b. 3.27 c. 0.61 d. 1.17

q14/ Complete the blank ............................................................is a circuit which carries power from feeder to the consumer load.

a) Explain the operation of the controlled full-wave bridge rectifier shown in figure 3. b) The controlled full-wave bridge rectifier shown in figure 3 has a source 120 V rms at 60 Hz, R = 1092, L=20 mH, and a = 60°. Determine: i. An expression for the load current. ii. The average load current. iii. The power absorbed by the load. iv. Sketch the graph of the output waveform. Vs S₁ S4 Figure $3 $₂ Lo Vo

ii)Rhs= 1.325 ℃/w

١-The PMSM used in the industry due to: a- Their low noise. b- Their easy control arrangement. c- Their efficiency. 2- The BLDCM used in the industry due a- Their low noise. b- Their easy control arrangement. - Their efficiency. 3- The (PMSM) supplied by: a- DC voltage. b- AC voltage of sinusoidal waveform. C- AC voltage of trapezoidal waveform. Choices

Assume that an input signal is applied to the circuit given above, as shown in the figure next to it. Accordingly, answer the following questions. The diodes used are silicon diodes, their operating voltages are 0.7 volts, and can be omitted because their resistance is very small. a) Write the name of this circuit, thinking about which circuit we do in the courses is equivalent to the purpose. b) What are the diodes/diodes that are active in a positive half-loop? Please type. c) What are the diodes/diodes active in the negative half-loop? Please type. d) Calculate ? ?−???( ?? ) for this circuit.

a- What is the diffusion Process? Why it is used?        b- Explain in your own words the meaning of in integrated circuits.

solve all parts

Question 3) An ohmic loaded half-wave controlled rectifier given in the figure below feeds a 25 Q load and the peak value of the source voltage is 350V and its frequency is 50 Hz. Accordingly, find the following desired circuit parameters: a) Effective (rms) voltage of the source, b) the peak current of the load, c) Average stress of the load, d) Average current of the load, e) The effective (rms) voltage of the load, f) Effective (rms) current of the load, g) Power of the load K R

Please provide answer for all

Subject : ECE

A half-wave rectifier has a 120 V rms, 60 Hz AC source. The load is a series inductance, resistance, and de source, with L= 120 mH, R= 12 £2, and Vdc 48 V. Determine (a) the power absorbed by the de voltage source, (b) the power absorbed by the resistance, and (c) the power factor.

Q15/   Complete the blank   Electron gun has a....................................................  for varying the electron density.

A single-phase bridge rectifier that supplies a very high inductive load such as a de motor is shown in Figure 3.9a. The turns ratio of the transformer is unity. The load is such that the motor draws a ripple-free armature current of I, as shown in Figure 3.9b. Determine (a) the HF of input current and (b) the input PF of the rectifier. Vm -V Fundamental component ot AD, AD, (M of (a) Circuit diagram (b) Waveforms

The 3-phase half-wave diode rectifier feeds a load consisting of a 50-ohm resistor. The sinusoidal sources in the input of the rectifier are wye-connected and phase-to-phase rms voltage is 380 volts. Calculate the power (in watts) absorbed by the load. Assume the diode is ideal. a. 680.36 b. 2267.90 C. 4082.20 d. 1700.90 e. 1360.70

The volt–ampere characteristic of a certain two-terminal device is a straight line that passes through the points (2 V, 5 mA) and (3 V, 15 mA). The current reference points into the positive reference for the voltage. Determine the equivalent circuit for this device.

Figure 1 shows the circuit diagram for a simple d.c. power supply. a. Identify the type of rectifier circuit represented in figure 1 and explain the operation of the circuit with reference to the function of each component within the circuit. b. Sketch to scale the voltage across R as a function of time showing its relationship to the secondary voltage from the transformer.

EXAMPLE: A single-phase, full-wave center-tapped rectifier supplies power to a 1-k2 load. The ac voltage applied to the diode is 600 V rms. If the diode resistance is 25 N and that of the transformer secondary is negligible. Determine (a) average load current (b) average value of load voltage Note: The rms value of the ac voltage across each secondary half is 300 V.

(b) A single-phase full converter charges a battery which offers a constant value of E. A resistor R is inserted to limit the battery charging current. Derive an expression for the average charging current. Find the value of R in case of battery charging current is 6 A, supply voltage is 40 V, 50 Hz, E=12 V and voltage drop in conducting SCR is 1 V determine: (i) Power dissipated in R (ii) Supply power factor

difference betwwen ic and chip?  with diagram example......

Discuss the impact of power consumption in microchip design and how it relates to the efficiency of electronic devices.

Discussion: 1. Discuss the obtained curves. 2. What are the advantages of using cascade voltage regulater circuit? 3. To stabilize a voltage of 65 V, one can: a. Use one 65V zener diode b. Use ten 6.5 V zener diodes in series If the costs are irrelevant, then which solution is best and why? I R. (A I O Vin v)Vout Figure (5.2) A stabilizer circuit with variable power supply. IL V (V) Vout RL Figure (5.3) A stabilizer çircuit with variable load.

Q1)Design moving coil ammeter as a voltmeter to read 15 V (RMS) alternating voltage. If the internal resistance of the ammeter is 5 K2, the voltage across the internal resistance is 0.5 v and the resistance of the diodes in the forward direction is 1 K2, find the multiplier resistance and sensitivity. Assume half wave rectification and a shunt resistance across the meter. The value of the shunt resistance across the ammeter is 2.5 KQ. Q2) Re-design the question above for full wave rectifier (without Rsh)

Explain why Silicon and Germanium are the most common semiconductor materials used in Electronics Devices? Give/Enumerate other semiconductor materials except Silicon and Germanium? Explain why they are not used in Electronics Devices. Explain why Covalent Bonding is used in bonding of semiconductor materials. Explain why Semiconductors are Negative Temperature Coefficient materials?

Three-phase half wave rectifier supply resistive load with DC power of 4 kW; the ammeter connected with D1 indicates 8 A r.m.s current, and the source frequency is 50 Hz Due to system inductance the average voltage drops to 96.2% of idealized value ( when the inductance is neglected). How much will the average and r.m.s voltage s be? The r.m.s phase current and average load current Is=? & Idc=? The secondary r.m.s voltage and transformer capacity Vs & KVA? The inductances causes the voltage drop Lc=? The diode forward current and maximum inverse voltage? Now, if the phase B is failed ( disconnected), how much with new dc voltage be in %..Vdc=….% ??

16. The insulation used in high voltage circuit breakers of large power rating is………………….17. In an impulse current generator the capacitors are connected in………………..18. A generating voltmeter is used to measure …….. …………………..19. For voltage measurements, …………… ……………. gives highest accuracy.20. For an RC divider to be compensated the condition is given by ……….……………formulation.

2

A-How temperature affects the conductivity of conductive metals and how it affects semiconductors.semiconductors B-What is superconductivity, how does it relate to temperature? Some examples of superconductors.superconductors.

(i) With neat sketch explain the cross sectional view and I-V characteristics of the device which is having     uncontrolled turn ON and turn OFF  withstanding capability.      (ii) Write FOUR application of the above mentioned power semiconductor device.

Fill in the blanks by inserting appropriate words/figures (i) The two principal electrodes present in every tube are w.r.t. cathode. (ii) A vacuum tube will conduct only if its plate is .. . (iii) A vacuum diode can be used as a.. . (iv) The plate current in a diode depends upon... than... (v) The control grid is near to (vi) The cut off grid voltage in a triode depends upon (vii) The negative resistance characteristics of tetrode are due to... (viii) A pentode is essentially a. current device. (ix) The screen and suppressor grids serve to change the. of tube. (x) The grid-to-plate capacitance is least in. .valve. 2. Pick up the correct wordlfigure from the bracket and fill in the blank. (i) If the cathode is at 150V and plate at 50V, then tube will (conduct, not conduct (ii) The internal resistance of a tube is mainly due to (space charge, vacuum, plate potential (iii) The suppressor grid in a pentode.. .secondary emission from plate. (iv) More noise is generated in pentode than in a…