ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Chapter 8.1, Problem 9RQ
What are the two configurations for chip resistors?
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QUESTION 5 ✓
A 100 kVA, 7200 -480 V 50 Hz single phase transformer has the following parameters all given
in ohms:
RLS = 0.00800 RHS = 1.96 RfеHS = 53.2
XLS = 0.01510 XHS=4.55 XMHS=7800
This transformer is operated in step-down mode and delivers 75% of its rated power to a load that
has a power factor of 0.93 lagging.
a) Draw the equivalent circuit model of the transformer with the equivalent series Z's referred to
the high voltage side (3 Marks)
b) Find the total Zin of the transformer at the high side (3 Marks)
c) Find input Z of the transformer with the load disconnected (3 Marks)
d) Find input voltage at 75% of the load required to maintain the rated load voltage (3 Marks)
e) Find an exciting current with the load disconnected (3 Marks).
60 Marks
2- Sketch the circuits in the Block 1, Block 2
and Black 3, Then show the type of every
circuit
Iov
Vout
Block!
Vouts
20
t
Vout 2
t
lovT
Block 2
-lov
P-50HZ
25
*Vout 3
Block 3-2
2.2V 22V
Chapter 8 Solutions
ELECTRICITY FOR TRADES
Ch. 8.1 - In what way is resistance wire different from the...Ch. 8.1 - What is the trade name for the most popular type...Ch. 8.1 - Prob. 3RQCh. 8.1 - Name the three ways by which resistors are rated.Ch. 8.1 - Resistors are classified as passive devices. Why?Ch. 8.1 - Identify the type of circuit that generally...Ch. 8.1 - State two functions served by a fusible resistor.Ch. 8.1 - What advantage do film resistors have over...Ch. 8.1 - What are the two configurations for chip...Ch. 8.1 - In what way is the construction of an adjustable...
Ch. 8.1 - Compare the connection and control function of a...Ch. 8.1 - If the wiper arm of a linear potentiometer is...Ch. 8.1 - Explain how a 10-turn trim pot is adjusted.Ch. 8.1 - Compare the way the resistance varies in a linear...Ch. 8.1 - Identify the color bands for each of the following...Ch. 8.1 - A 680- resistor has a rated tolerance of 10...Ch. 8.1 - What is the color code for a 365- five-band...Ch. 8.1 - Determine the resistance value and percentage of...Ch. 8.1 - Determine the resistance value and percentage of...Ch. 8.2 - Calculate the total resistance for each of the...
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- 3. The per unit values of positive, negative and zero sequence reactances of a network at fault are 0.08, 0.07 and 0.05 respectively. Determine the fault current if fault is line-to-line-to-ground. [j 16 p.u.]arrow_forwardFor the network shown in Figure B2, the switch is closed on to position I when t = 0 and then moved to position 2 when t = 100 ms. 1V 50 R₁ R₂ 200 10 mH Figure B2 a) i. What is the value of the time constant when charging (position I)? ii. Determine the current equation when charging (position I) [I mark] [2 marks] b) Determine the value of the charging current at 1.5 ms. [3 marks] i. What is the value of the time constant when discharging? [2 marks] ii. Determine current equation when discharging (remember switch is moved to position 2 when t = 100 ms) [3 marks] c) Determine the current in the inductor when t = 102.5 ms (remember switch is moved to position 2 when t = 100 ms) [4 marks]arrow_forwardNEED HANDWRITTEN SOLUTION PLEASE DO NOT USE AIarrow_forward
- NEED HANDWRITTEN SOLUTION PLEASE DO NOT USE AIarrow_forward1) What is the value of the current through the battery when the switches SW1, SW2, and SW3 are OPEN?arrow_forwardIn the circuit of the figure, ε = 12.2 V, R = 7.34 Ω and L = 5.48 H. The battery is connected at t = 0. Determine: a) The amount of energy delivered by the battery during the first 2.00 s. b) The amount of energy stored in the magnetic field of the inductor. c) The amount of energy dissipated in the resistor.arrow_forward
- 4) For the sinusoidal signal m(t) = 2 sin(1000πt + 0.0557), shown down, is sampled, quantized and then encoded using the PCM technique. If a uniform quantizer, with 8 levels and a dynamic range [-2, 2], is used (a) Calculate the first 4 quantized samples and the ciated quantization errors. (b) Calculate the maximum quantization error (c) Calculate the signal-to-quantization- noise ratio. (d) Calculate the resultant bit rate. italicio (e) If it is required to increase the signal-to-quantization-noise ratio by 6 dB, how many quantization levels should be used in this case? What is the ratio between the new bit rate and the previous bit rate? msecarrow_forwardThe current of a 90.0 mH inductor changes with time in the form I=1.00t2 - 6.00t (in SI units). Determine the magnitude of the induced fem at a) t=1.00 s b) At what time will the fem equal zero?arrow_forwardA coil of 200 turns and 4 cm2 of section, is rotating in a magnetic field of 0.5 T. a) What must be its angular frequency to generate a maximum fem (εm) of 10 V?b) What is the value of εm if it rotates at 60 rev/s?arrow_forward
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