n5 industrial electronics april 2016 memorandum...title: microsoft word - n5 industrial electronics...
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NATIONAL CERTIFICATE
APRIL EXAMINATION
INDUSTRIAL ELECTRONICS N5
7 APRIL 2016
This marking guideline consists of 13 pages.
MARKING GUIDELINE
MARKING GUIDELINE -2- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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QUESTION 1 1.1
CIRCUIT DIAGRAM OF RC-COUPLING
INPUT- AND OUTPUT WAVEFORMS
(4) 1.2
(3)
MARKING GUIDELINE -3- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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1.3 1.3.1 XL = 2.p.f.L
= = 6,283 W = W
ZT =
=
=
= W (4)
(4) 1.3.2 IT =
=
= A
(2) 1.3.3 IL =
=
= A
(2) 1.3.4 IR =
=
= A
(2) [17]
3 -32 × π × 100 × 10 × 0,001 × 10
06,283 90
L
L
R × jXR + jX
0 020 0 × 6,283 9020 + j6,283
0
0125,664 9020,96417,4
05,994 72,6
T
T
VZ
0
020 0
5,994 72,6
03,34 -72,6
T
L
VjX
0
020 0
6,283 90
03,183 -90
TVR
0
020 020 0
010
MARKING GUIDELINE -4- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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QUESTION 2 2.1 2.1.1 r =
\ C =
= 962,25 µf
(2) 2.1.2 Idc =
=
= 120 mA
Vdc =
\ Vm =
=
= 12,624 V
(4) 2.2 IZ =
=
= 50 mA
RS =
=
= 120 W
(4)
L
14 3 . f . C . R
14 3 50 100 0,03´ ´ ´
dc
L
VR
12100
dcm
IV - 4 f C
dcdc
IV + 4 f C
-60,1212 +
4 50 962,2 10æ öç ÷
´ ´ ´è ø
Z
Z
PV
-3500 1010´
(max) 2
Z(max)
V - VI
i
-316 - 10
50 10´
MARKING GUIDELINE -5- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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2.3
HIGH STABLE ADJUSTABLE VOLTAGE REGULATOR
(5) [15] QUESTION 3 3.1 • Inverse saturating current, ICO, which doubles for each 10 °C increases in
temperature. • Base emitter voltage, VBE, which decreases with 2,5 mV/°C. • Current gain, b, which increases with temperature. (3 x 1)
(3) 3.2 Ven =
=
= 1,2 V
IC
\IE =
IC =
=
= 10 mA
CC1 V10 ´
1 1210 ´
EI@
EE
VR
EE
VR
1,2120
MARKING GUIDELINE -6- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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IC =
IB =
=
= 40 µA
RC =
VCE = = \ VCE = 6 V
VB =
=
= 1,9 V
OR
VB = VE + VBE = 1,2 + 0,7 = 1,9V
(10) 3.3 Z1 = hie
= 1,2 kW But Z = RBT || Z1
\ RBT =
=
= 2 524,991 W
B. Ib
CIb
310 10250
-´
C
ECECC
IVVV --
)R.I(VV CCECC --
)4801010(2,112 3 ´´-- -
B2CC
B B2 1
R × V
R + R
3000 × 123000 + 15947
B B1 2B B1 2
R RR + R
´
15947 300015946 + 3000
´
MARKING GUIDELINE -7- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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ZI =
= 813,42 W Z2 =
=
= 50 kW
ZO =
=
= 475,436 W
(5) [18] QUESTION 4 4.1 Drift is a slow variation on the output while the input remains constant. (2) 4.2
ACTIVE HIGH PASS FILTER
(3)
2524,9908 × 12002524,9908 + 1200
oe1h
-61
20 × 10
C 2C 2
R × ZR Z+
480 × 50000480 + 50000
MARKING GUIDELINE -8- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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4.3 fo =
=
= 1591,55 Hz
(3) 4.4
PRACTICAL OPERATIONAL INTEGRATOR
(3)
[11] QUESTION 5 5.1 5.2 5.3
True False True
(3 x 1)
[3]
12 . . C . Rp
-61
2 0,1 10 1000p´ ´ ´ ´
MARKING GUIDELINE -9- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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QUESTION 6 6.1
THERMISTOR BRIDGE WITH DC-BIAS
(4) 6.2 6.2.1 T = 0C + 273
= 30 + 273
= 303 K
\ RT =
= = 8372,747 W
(2)
BTA . e
32003030,2169 e´
MARKING GUIDELINE -10- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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6.2.2 VAB =
\ VA =
=
= 5 V
\ VB =
=
= 4,56 V
\ VAB =
= 5 – 4,56
= 0,44 V \ Gain of amplifier (AV)
=
=
= 22,73
(7) [13]
BA VV -
2T
1 2
R VR + R
´
10 k 1010 k + 10 k
W´
W W
t
t 3
R 10R + R
´
8372,747 108372,747 + 10000
´
BA VV -
OVVi
100,44
MARKING GUIDELINE -11- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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QUESTION 7
[6] QUESTION 8
A FREQUENCY COUNTER
[5]
MARKING GUIDELINE -12- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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QUESTION 9 9.1
THE R-C PHASE SHIFT OSCILLATOR
(5) 9.2 f =
\ R =
=
= 129,95 W
(3)
12 .R.C 6p
12 .f.C 6p
6 -91
2 50 10 10 10 6´ p´ ´ ´ ´ ´
MARKING GUIDELINE -13- T730(E)(A7)T INDUSTRIAL ELECTRONICS N5
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9.3
THE SCHMITT CIRCUIT
(4) [12] TOTAL: 100