Activation and Testing Module Test

List two Loop (PLL) in important uses. of phase locked analog Communication System.

What is the maximum period for which a thyristor can operate in a unified three-phase controller?

The single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)

4. Explain the relationship between back emf E, terminal voltage V and coil voltage drop IR in DC motor and generator respectively. i. Describe how the field strength affect the performance of DC motor and generator. ii. Explain how an external resister changes the DC motor and generator performance.

9. Which grounding method is typically required of higher-voltage systems? A. Grounding through inductorsB. Grounding through a low amount of resistanceC. Grounding through a high-impedance device D. Grounding through surge arresters 10. Which term relates to the conductors connected to the output side of a separately derived system? A. Neutral conductorB. Transformer secondary conductorC. System conductor D. Derived phased conductor 11. If there's no service disconnect at a remotely supplied building, then the grounding electrode conductor and the equipment grounding conductor can be bonded together at a A. junction box.B. structural steel location. C. grounding electrode rod. D. water line. 12. In a DC system, the bonding jumper between the negative of the supply and ground is normally made at the source or at the A. first disconnecting means. B. first device on the supply. C. end of the DC line.D. entrance to the building. 13. Which of the following is a common raceway…

What is the edge of using Phase Locked Loop Demodulator rather than other FSK demodulator circuits?

The single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)

Analyze and discuss different types of Air blast circuit breakers. Explain with the help of neat and clean diagram the working of axial blast circuit breakers. Also comment on the function of series isolator in this type circuit breaker.

compare in table between Parellel Pair Twisted Pair Coaxial Cable  Fiber Optic

Discuss the Electrical techniques used for Failure Analysis

A.1. How many normally open auxiliary relay contacts are shown in the schematic diagram in Figure A7?A. 2 B. 3 C. 1 D. 0 A.2. What type of diagram is shown in Figure A7?A. Three-line schematic diagramB. Block diagram C. Wiring diagram D. Single-line ladder diagram A.3- What type of component is labeled A in figure A7?A. oil-type breaker, B. auxiliary contact, C. Normally closed breaker, D . NC pressure switch

Question :3 calculate the current carrying capacity of cable protected by fuse with 60 A ,the first half of the cable is laying in the air where the ambient temperature derating factor is 0.71 and the the cable is grouped with four cables however the grouping factor Cg 0.73 . and the second part of cable is thermally isolated Ci = 0.6 ,the correction factor of protective fuse is 0.725. 60A Part A Part B

A. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With references

110 About indistrial piping WHY IS THE ASME 31.3 ALLOWABLE VOLTAGE A COMBINED VOLTAGE?

2. What is the purpose of conducting Short Circuit (SC) test?

b) Draw a diagram of a Phase Locked Loop (PLL), describe the operation of the PLL.

Answer all the questions 1. Draw a 6-stage cascaded voltage multiplier circuit for high voltage DC generation and explain the working principle. 2. Compare the properties of Solid insulators and liquid dielectrics? 3. Define Basic Insulation Level (BIL) in power systems and Explain the voltage - time relationship with the curve in insulation coordination. 4. What are the three protective methods for surges, explain one method. 5. What are the different types of surge diverters and explain any two methods? 6. A 12-stage impulse voltage generator has a total generator capacitance of C1. The wave front resistance equal to 15000 2 and load capacitance of 2500pF. The wave tail resistance is 30 times of wave front resistance and if rise time is 1.5 µs. Calculate (i) the value of each capacitor of the generator and (ii) the tail time of the impulse wave?

1 - Why make two wire, three wire or four wire connection in RTD connection?A) To be a backup connection lineB) To increase the magnetic fieldC) Because the resistance of the long connecting wires causes errorD) To increase the costE) For better cooling

Explain this sma connector

With the aid of power-load angle curves explain in details i) An electronic governor’s response to frequency changes resulting from changing loads.

Explain the concept of cable shielding and its significance in reducing electromagnetic interference (EMI) and radiofrequency interference (RFI).

Question : a) Examine and Identify the cause of the followings: i) The air blast breakers are very sensitive to the rate of rise of re-striking voltage. ii) Circuit interruption easier in an AC circuit than in a DC circuit. iii) Surge diverters located very close to the equipment to be protected. b) Assuming the same peak value, compare the following two surges: 1/50 usec surge and 3/50 usec surge.

What wire label should I put in rollover cable using EIA/TIA-568A and EIA/TIA-568A and what color for each pin

c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.

Write True or False and correct the wrong statement (Ans 7. The unit nearest to the cross-arm in tower has maximum voltage across it and hence it likely to be repaired. 8. Corona losses in DC Transmission supply 10 times more than AC transmission. 9. Irregularity Factor (mv) has value of 0.9 to 0.95 in rough conductor. 10.Power losses in corona dissipated in the form of conductor vibrating. 11. The corona loss on a particular system at 50 Hz is 1 kW/Km per phase but for the same system but 60 Hz will be 1.5 kW/Km per phase. 12.If the number of poles in 3ph 11kV transmission line is 80, then we need 420 discs to suspend the conductor on these poles.

Discuss the concept of an Electrical fault. How can we prevent such catastrophic incidentfor such fault in an electrical system?

Short circuit test measure half load copper loss. True or False

What types of fuses are heavy-duty time delay fuses used for circuits that have motor loads or circuits with motors that cycle on and off frequently? A. Types S and TB. NTDF fusesC. Edison-base fuses D. Types TL and SL