1. a) Compute the capacitance of a parallel-plate capacitor with plates 10 cm by 20 cm and separation of5 mm if the dielectric are(i) an air dielectric,(ii) a ceramic dielectric with permittivity of 7500.(2 Marks)b) For the arrangement shown in figure 1, find2 µF(i) the equivalent capacitance of the circuit,15 μF(ii) the voltage across QR, andR(iii) the charge on each capacitor.(3 Marks)3 µF240 V OFigure 12.For a current of r.m.s. value 5 A, and frequency 2 kHz, write down the standard expression.Hence, calculate:(a) the instantaneous value 150 µs after it passes through zero, and(b) the time taken for it to reach 4 A, after passing through zero for the first time.(5 Marks)3.The waveform displayed on an oscilloscope is as shown in Figure 3. The 'time/cm' switch is set to 2ms/cm, and the 'volts/cm' switch is set to 0.5 V/cm. Determine:(1) amplitude of waveform Q(ii) peak to peak value of waveform PP(iii) frequency of waveform P(iv) angular frequency of waveform Q and(v) phase angle differ ence between P andQ in Degrees.(5 Marks)Figure 3

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1. a) Compute the capacitance of a parallel-plate capacitor with plates 10 cm by 20 cm and separation of 5 mm if the dielectric are (i) an air dielectric, (ii) a ceramic dielectric with permittivity of 7500. (2 Marks)

1. a) Compute the capacitance of a parallel-plate capacitor with plates 10 cm by 20 cm and separation of 5 mm if the dielectric are (i) an air dielectric, (ii) a ceramic dielectric with permittivity of 7500. (2 Marks)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

1. a) Compute the capacitance of a parallel-plate capacitor with plates 10 cm by 20 cm and separation of
5 mm if the dielectric are
(i) an air dielectric,
(ii) a ceramic dielectric with permittivity of 7500.
(2 Marks)
b) For the arrangement shown in figure 1, find
2 µF
(i) the equivalent capacitance of the circuit,
15 μF
(ii) the voltage across QR, and
R
(iii) the charge on each capacitor.
(3 Marks)
3 µF
240 V O
Figure 1
2.
For a current of r.m.s. value 5 A, and frequency 2 kHz, write down the standard expression.
Hence, calculate:
(a) the instantaneous value 150 µs after it passes through zero, and
(b) the time taken for it to reach 4 A, after passing through zero for the first time.
(5 Marks)
3.
The waveform displayed on an oscilloscope is as shown in Figure 3. The 'time/cm' switch is set to 2
ms/cm, and the 'volts/cm' switch is set to 0.5 V/cm. Determine:
(1) amplitude of waveform Q
(ii) peak to peak value of waveform P
P
(iii) frequency of waveform P
(iv) angular frequency of waveform Q and
(v) phase angle differ ence between P and
Q in Degrees.
(5 Marks)
Figure 3

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