to the equal in magnitude thee LHC duro be one 22.3063.93 SECTION B-Choose any TWO (2) Questions from this Section QUESTION 1 [25 marks] 2-10+0 T Non-php 2p=en 2ph 20 (a) A balanced star-connected load, each having a resistance of 10 ohms and inductive reactance of p 20 ohms is connected to a 400 V, 50 Hz supply. Two wattmeters connected to read total power have their current coils connected in the RED and BLUE lines respectively. Calculate the reading of each wattmeter. (b) List three characteristics of a three-phase balanced system 7674 (15) (3) (c) The maximum flux density in the core of a 6600/11000 Volts, 50 Hz single phase transformer is 2.5 Wb/m². If the emf per turn is 20 volts, determine: (i) Primary and secondary turns (ii) Area of the core V₁ = 6600 V₁ = 1100 (4) P. VI. Cas (30+9) (3) f-SOHL =201 deur Stev QUESTION 2 [25 marks] Ju= 1ph VL√ Uph (a) A 230 V, 50 Hz supply is feeding the following loads that are connected parallel to the supply: A p=3 motor load of 4 kW at 0.6 lagging power factor; a rectifier of 3 kW at 0.7 leading power factor; and a lighter-load of 10 kVA at unit power factor. Determine; (i) Total real power (kW) (ii) Total reactive power (kVAR) (iii) Overall power factor.. 410 = 230194 (5) pl (8) (3) (iv) The value of capacitive reactive power required if power factor correction capacitor is installed to improve overall power factor to unity wb (v) Capacitive reactance of installed capacitor QUESTION 3 125 marks] (4) 凍 (5) (a) A 3-ph, 450 V system with R-Y-B sequence supplies a balanced delta-connected load of 12 kW at 0.8 pf lagging. Using 'a' operator method. Calculate; (1) Phase currents (ii) Line currents (iii)Impedance per phase V lub b) Draw a fully labelled equivalent circuit diagram of a transformer 2011+ (6) (3)\ 93.42° =-847.01 W 33.43 A = Фото ва Факу (10) D 25-10 t 34460 WB= B + -247.21 8448-10 P= W, W₂ F= 4 PE 3 IL Casp N₁ E P= √3x40x 10.30.447 M 3 Pe 3 199.10 W V=12
to the equal in magnitude thee LHC duro be one 22.3063.93 SECTION B-Choose any TWO (2) Questions from this Section QUESTION 1 [25 marks] 2-10+0 T Non-php 2p=en 2ph 20 (a) A balanced star-connected load, each having a resistance of 10 ohms and inductive reactance of p 20 ohms is connected to a 400 V, 50 Hz supply. Two wattmeters connected to read total power have their current coils connected in the RED and BLUE lines respectively. Calculate the reading of each wattmeter. (b) List three characteristics of a three-phase balanced system 7674 (15) (3) (c) The maximum flux density in the core of a 6600/11000 Volts, 50 Hz single phase transformer is 2.5 Wb/m². If the emf per turn is 20 volts, determine: (i) Primary and secondary turns (ii) Area of the core V₁ = 6600 V₁ = 1100 (4) P. VI. Cas (30+9) (3) f-SOHL =201 deur Stev QUESTION 2 [25 marks] Ju= 1ph VL√ Uph (a) A 230 V, 50 Hz supply is feeding the following loads that are connected parallel to the supply: A p=3 motor load of 4 kW at 0.6 lagging power factor; a rectifier of 3 kW at 0.7 leading power factor; and a lighter-load of 10 kVA at unit power factor. Determine; (i) Total real power (kW) (ii) Total reactive power (kVAR) (iii) Overall power factor.. 410 = 230194 (5) pl (8) (3) (iv) The value of capacitive reactive power required if power factor correction capacitor is installed to improve overall power factor to unity wb (v) Capacitive reactance of installed capacitor QUESTION 3 125 marks] (4) 凍 (5) (a) A 3-ph, 450 V system with R-Y-B sequence supplies a balanced delta-connected load of 12 kW at 0.8 pf lagging. Using 'a' operator method. Calculate; (1) Phase currents (ii) Line currents (iii)Impedance per phase V lub b) Draw a fully labelled equivalent circuit diagram of a transformer 2011+ (6) (3)\ 93.42° =-847.01 W 33.43 A = Фото ва Факу (10) D 25-10 t 34460 WB= B + -247.21 8448-10 P= W, W₂ F= 4 PE 3 IL Casp N₁ E P= √3x40x 10.30.447 M 3 Pe 3 199.10 W V=12
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...
Related questions
Question
![to the equal in magnitude
thee
LHC duro be one
22.3063.93
SECTION B-Choose any TWO (2) Questions from this Section
QUESTION 1 [25 marks]
2-10+0
T
Non-php
2p=en
2ph
20
(a) A balanced star-connected load, each having a resistance of 10 ohms and inductive reactance of p
20 ohms is connected to a 400 V, 50 Hz supply. Two wattmeters connected to read total power have
their current coils connected in the RED and BLUE lines respectively. Calculate the reading of each
wattmeter.
(b) List three characteristics of a three-phase balanced system
7674
(15)
(3)
(c) The maximum flux density in the core of a 6600/11000 Volts, 50 Hz single phase transformer is
2.5 Wb/m². If the emf per turn is 20 volts, determine:
(i) Primary and secondary turns
(ii) Area of the core
V₁ = 6600
V₁ = 1100
(4)
P. VI. Cas (30+9) (3)
f-SOHL
=201
deur
Stev
QUESTION 2 [25 marks]
Ju= 1ph
VL√ Uph
(a) A 230 V, 50 Hz supply is feeding the following loads that are connected parallel to the supply: A p=3
motor load of 4 kW at 0.6 lagging power factor; a rectifier of 3 kW at 0.7 leading power factor; and
a lighter-load of 10 kVA at unit power factor. Determine;
(i) Total real power (kW)
(ii) Total reactive power (kVAR)
(iii) Overall power factor..
410 = 230194
(5)
pl
(8)
(3)
(iv) The value of capacitive reactive power required if power factor correction capacitor is
installed to improve overall power factor to unity
wb
(v) Capacitive reactance of installed capacitor
QUESTION 3 125 marks]
(4) 凍
(5)
(a) A 3-ph, 450 V system with R-Y-B sequence supplies a balanced delta-connected load of 12 kW
at 0.8 pf lagging. Using 'a' operator method. Calculate;
(1) Phase currents
(ii) Line currents
(iii)Impedance per phase
V
lub
b) Draw a fully labelled equivalent circuit diagram of a transformer
2011+
(6)
(3)\
93.42°
=-847.01 W
33.43
A =
Фото ва
Факу
(10) D
25-10
t
34460 WB=
B
+
-247.21
8448-10
P= W, W₂
F= 4
PE 3 IL Casp
N₁
E
P= √3x40x 10.30.447 M
3
Pe 3 199.10 W
V=12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2006393e-c97e-4081-8173-0190425f3dd9%2F10eef7de-e7e7-4a51-858d-652fb4f30ff9%2Fidshvo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:to the equal in magnitude
thee
LHC duro be one
22.3063.93
SECTION B-Choose any TWO (2) Questions from this Section
QUESTION 1 [25 marks]
2-10+0
T
Non-php
2p=en
2ph
20
(a) A balanced star-connected load, each having a resistance of 10 ohms and inductive reactance of p
20 ohms is connected to a 400 V, 50 Hz supply. Two wattmeters connected to read total power have
their current coils connected in the RED and BLUE lines respectively. Calculate the reading of each
wattmeter.
(b) List three characteristics of a three-phase balanced system
7674
(15)
(3)
(c) The maximum flux density in the core of a 6600/11000 Volts, 50 Hz single phase transformer is
2.5 Wb/m². If the emf per turn is 20 volts, determine:
(i) Primary and secondary turns
(ii) Area of the core
V₁ = 6600
V₁ = 1100
(4)
P. VI. Cas (30+9) (3)
f-SOHL
=201
deur
Stev
QUESTION 2 [25 marks]
Ju= 1ph
VL√ Uph
(a) A 230 V, 50 Hz supply is feeding the following loads that are connected parallel to the supply: A p=3
motor load of 4 kW at 0.6 lagging power factor; a rectifier of 3 kW at 0.7 leading power factor; and
a lighter-load of 10 kVA at unit power factor. Determine;
(i) Total real power (kW)
(ii) Total reactive power (kVAR)
(iii) Overall power factor..
410 = 230194
(5)
pl
(8)
(3)
(iv) The value of capacitive reactive power required if power factor correction capacitor is
installed to improve overall power factor to unity
wb
(v) Capacitive reactance of installed capacitor
QUESTION 3 125 marks]
(4) 凍
(5)
(a) A 3-ph, 450 V system with R-Y-B sequence supplies a balanced delta-connected load of 12 kW
at 0.8 pf lagging. Using 'a' operator method. Calculate;
(1) Phase currents
(ii) Line currents
(iii)Impedance per phase
V
lub
b) Draw a fully labelled equivalent circuit diagram of a transformer
2011+
(6)
(3)\
93.42°
=-847.01 W
33.43
A =
Фото ва
Факу
(10) D
25-10
t
34460 WB=
B
+
-247.21
8448-10
P= W, W₂
F= 4
PE 3 IL Casp
N₁
E
P= √3x40x 10.30.447 M
3
Pe 3 199.10 W
V=12
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