SECTION A. Attempt all questions d.
demodulation
1. Flip flops are also known as 5. When information is added to a carrier
a. Bistable to vary its frequency, the process is
b. Free running called
c. Astable a. phase modulation
b. frequency modulation.
d. Monostable c. amplitude modulation
d. pulse modulation.
Fig.1
Fig.2
2. The resonant frequency in fig.1 is
expressed as 6. The distance between A and B in Fig.2
a. Fo = 2πL1C2 is called
1 a. frequency
b. Fo = b. velocity
2 π √ L1 c 1
c. wavelength
1
c. Fo = d. current
2 πL 1C 1
7. The number of sideband frequencies
2π
d. Fo = produce by amplitude modulation is
√ L 1C 1
a. One
3. The Primary Colours used in colour TV
b. Two
receiver are
c. three
a. blue, red and yellow
d. four
b. red, blue and green
8. If 1MHz carrier is modulated by 1KHz
c. magnet, cyan and yellow
audio signal, the upper sideband is
d. red, black and green
a. 0.997HHz
4. When an audio signal is impressed on a
b. 0.999KHz
carrier is known as
c. 1.001MHz
a. transmission
d. 1.003MHz.
b. reception
c. modulation
1
Fig.3 Fig.4
13. The symbol in Fig.4 is
Fig.3 is a combinational circuit. Use it to
a. integrated circuit
answer question 9 to 11.
b. operational amplifier
9. The Boolean expression at point Q of the
c. diode
inverter is
d. transistor.
a. A+B
14. Which ONE of the following does not
b. A+ B
use LC tuned circuit?
c. A.B
a. Hartley Oscillators
d. A.B
b. Colpitt Oscillators
10. The Boolean expression at F is
c. Phase shift Oscillators
a. ( A . B).(A + B)
d. Crystal Oscillators.
b. (A.B) + (A+B)
15. Which ONE of the following Oscillators
c. (A + B) + (A + B)
generates low signal frequency?
d. ( A+ B ). (A + B)
a. Hartley
11. Which type of logic gate will produce at
b. Colpitt
output F?
c. Phase shift
a. EX – OR gate
d. Crystal
b. EX – NOR gate
16. The active component in an astable
c. NOR gate
multivibrator circuit is
d. AND gate
a. Resistor
12. The number of sidebands produce by
b. Capacitor
frequency modulation is
c. Inductor
a. One
d. transistor
b. Two
17. One condition for sustaining oscillation
c. three
in an oscillator is a
d. infinite
a. Gain around the feedback loop at
less than 1
2
b. Phase shift around the feedback loop b. Cyan
of 0º c. White
c. Phase shift around the feedback loop d. Magenta
at 180º
Use Fig.6 to answer questions 22 to 25
d. Gain around feedback loop at one
third
18. A radio station has a frequency of
100MHZ. the wave length is
a. 3m Fig.6
b. 3.3m 22. The Boolean expression at G3 is
c. 30m a. A
d. 300m b. B
c. A.B
Use fig.5 to answer questions 19 to 21.
d. A.B
23. The Boolean expression at G4 is
a. A
b. B
c. A.B
Fig.5 d. ( A . B) ⊕ (A.B)
19. In fig.5 the area marked B is 24. The Boolean expression at G5 is
a. Yellow a. A.B
b. Magenta b. ( A . B) ⊕ (A.B)
c. White c. A.B
d. Cyan d. A.B
20. The area marked ‘A’ in fig.5 is
25. Which type of logic gate will produce at
a. White
the output of G5?
b. Magenta
a. EX – OR gate
c. Yellow
b. EX – NOR gate
d. Cyan
c. NOR gate
21. In fig.5, the area marked ‘C’ represents
d. AND gate
a. Yellow
3
30. An oscillator that produces non
sinusoidal waveform is called?
a. Harmonic oscillator
Fig.7 b. Relaxation oscillator
26. In Fig.7 indeed, the Boolean expression c. RC oscillator
at output Z is d. LC oscillator
a. A.B 31. Number of frames per second in
b. A.B television transmission and reception is
c. A.B a. 625
d. A+B b. 15625
27. In relation to television transmission and c. 25
reception, line frequency is d. 35
a. 50Hz 32. an amplifier that is biased so that the
b. 5MHz current flows throughout the entire cycle
c. 625Hz is
d. 15625Hz a. Class B pull push amplifier
28. within the television system in Ghana, b. Class AB amplifier
the number of lines per frame is c. Class C amplifier
a. 400 lines per frame d. Class A amplifier
b. 625 lines per picture 33. In a voltage amplifier, the input signal is
c. 629 lines per frame 12V and the output voltage is 60V. The
d. 525 lines per frame voltage gain of the amplifier in decibel
29. Scanning is a technique for converting is.
the charge images created within a a. 13.979dB
television camera tube into a variable b. 6.989dB
electrical signal. True/false c. 10.979dB
a. False d. 8.989dB
b. True 34. The ratio of the output to the input of an
c. A only amplifier is called?
d. Neither A nor B a. Voltage gain
b. Power gain
4
c. Gain d. Oscillator
d. Current gain
Fig.9 is an integrated circuit/op-amp
35. The type of propagation in which radio
wave is reflected from the ionosphere is
called
a. Surface wave
b. Sky wave Fig.9
c. Space wave
d. Ground wave 39. Which ONE of the following letters
represent pin 3?
Fig.8 is a block diagram of FM superheat a. Pin A.
radio receiver. Use it to answer questions 35
to 37. b. Pin B.
c. Pin C.
d. Pin D.
Fig.8
Fig.10
36. Block C represents
40. The overall voltage gain of the
a. R.F amplifier
multistage amplifier in fig.10 is
b. I.F amplifier
a. 30dB
c. Mixer
b. 40dB
d. Oscillator
c. 25dB
37. Block F represents
d. 50dB
a. A.F voltage amplifier
b. A.F power amplifier
c. R.F amplifier
d. I.F amplifier
38. Block D represents Prepared by A.K Somebooks
a. R.F amplifier
b. I.F amplifier
c. Mixer
5
6
