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


QUESTION 1 1.1

CIRCUIT DIAGRAM OF RC-COUPLING

INPUT- AND OUTPUT WAVEFORMS

(4) 1.2

(3)



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



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´



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



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

´



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



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´ ´ ´ ´



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´



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



QUESTION 7

[6] QUESTION 8

A FREQUENCY COUNTER

[5]



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´ ´ ´ ´ ´


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9.3

THE SCHMITT CIRCUIT

(4) [12] TOTAL: 100

N5 Industrial Electronics April 2016 Memorandum...Title: Microsoft Word - N5 Industrial Electronics...

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