1. Farad is a unit of (a) Resistance (b) Inductance (c) Capacitance. (d) Frequency.
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1 Department of Examinations, Sri Lanka EXAMINATION FOR THE AMATEUR RADIO OPERATORS CERTIFICATE OF PROFICENCY ISSUED BY THE DIRECTOR GENERAL OF TELECOMMUNICATIONS OF SRI LANKA (1998) (NOVICE CLASS) Basic Electricity, Radio and Electronics Theory Two hours Index No : Answer al l questions on this paper itself. A minimum of 50 marks is required for a pass. Pick out the correct answer and underline it. 1. Farad is a unit of (a) Resistance (b) Inductance (c) Capacitance. (d) Frequency. 2. The rms value of 230V, 50Hz main supply is (a) 230V (b) V (c) 2x230V (d) V pf capacitance is equivalent to (a) 1x10-12 F (b) 1x10-13 F (c) 1x10-9 F (d) 1x10-10 F 4. The length of a current carrying conductor is halved, the resistance will became (a) half. (b) double. (c) one fourth. (d) same. 5. The effective resistance between A and B in the circuit shown is (a) 1 Ω (b) 2Ω (c) 3Ω (d) 4Ω 6. The unit of frequency is (a) Hertz. (b) Volt. (c) Ampere. (d) Ampere meter. 7. What is the magnitude of the current flowing through PQ in the given circuit? (a) 1A. (b) 2A. (c) 3A. (d) 4A. 8. The prefix micro is equivalent to (a) 10-3 (b) 10-6 (c) 10 3 (d) 10 6
2 9. A 100Ω resistor dissipates a power of 1W. The current flowing across the resistor is (a) 0.01A (b) 0.1A (c) 1A (d) 10A 10. The input power of a transmitter running at 48V, 2A is (a) 24W (b) 48W (c) 96W (d) 192W 11. The frequency range from 3MHz to 30MHz is generally referred to as (a) low frequency. (b) high frequency. (c) very high frequency. (d) ultra high frequency. 12. What is the total capacitance between the points A and B? (a) C/2 (b) C (c) 13C/36 (d) 36C/ The reactance of a 2mH smoothing choke at a frequency of 50Hz is (a) 1x10-1 π Ω (b) 2x10-2 π Ω (c) 4x10-1 π Ω (d) 2x10-1 π Ω 14. A half wave antenna is resonant at 60MHz. Its approximate length will be (a) 2.5m (b) 5m (c) 10m (d) 20m 15. The output signal of a balanced modulator is (a) SSB (b) DSB (c) AM (d) FM 16. In the ionosphere, the lowest layer is known as (a) D layer (b) E layer (c) F 1 layer (d) F 2 layer 17. The energy stored in an inductor L is given by (a) LI/2 (b) LV/2 (c) LI 2 /2 (d) LIV/2 18. The radiation resistance of a dipole antenna is (a) 50Ω (b) 75Ω (c) 150Ω (d) 300Ω 19. The wavelength of a signal at 100MHz in free space is (a) 0.3m (b) 3m (c) 10m (d) 20m 20. Envelop or diode detector is used for the detection of (a) AM signals. (b) FM signals. (c) SSB signals. (d) CW signals.
3 21. The total inductance between A and B in the circuit shown is (a) H (b) 2H (c) 3H (d) 4H 22.A varactor diode acts as a variable (a) resistance (b) inductance (c) capacitance (d) none of the above 23. Over modulation occurs when the modulation index (m) is such that (a) m = 0 (b) m=1 (c) m < 1 (d) m > The magnification factor of a parallel (LRC) circuit is given by (a) Q = L/R (b) Q = LR (c) Q = C/L (d) L/C 25. A transformer is laminated to (a) reduce hysteresis losses. (c) reduce eddy current losses. (b) increasing exciting current. (d) increasing magnetic flux. 26. The electric field of an antenna is perpendicular to the earth s surface. The polarization of the antenna is (a) horizontal. (b) vertical (c) circular. (d) none of the above. 27. An antenna whose input impedance is 75Ω should have a feeder link with an impedance of (a) 50Ω (b) 75Ω (c) 150Ω (d) 300Ω 28. The resonant frequency of a tuned (LRC) circuit is given by 29. The magnification factor of a series (LRC) circuit is given by MHz is the third harmonic of (a) 9.1MHz (b) 13.65MHz (c) 54.6MHz (d) 81.9MHz
4 microhenry inductance is equivalent to (a) 1x10-5 (b) 1x10-6 (c) 1x10-7 (d) 1x When 4V emf is applied across 1F capacitor, the energy stored in the capacitor is (a) 2J (b) 4J (c) 8J (d) 16J 33. A transformer is used to change the value of (a) voltage. (b) power. (c) frequency. (d) none of these. 34 The symbol shown indicates a (a) diode. (b) pnp transistor. (c) npn transistor. (d) Zener diode. 35. To measure the voltage of a circuit, a voltmeter must be connected in (a) series with the circuit. (b) parallel with the circuit. (c) either series or parallel with the circuit. (d) none of the above. 36. The megger is used for (a) measuring current. (b) measuring voltage. (c) measuring power. (d) testing insulation. 37. The automatic gain control (AGC) circuit is usually used to control the gain of the (a) mixer. (b) detector. (c) audio amplifier. (d) IF amplifier. 38. The purpose of adding reflectors and a director to a folded dipole antenna is to (a) increase its impedance. (b) decrease its impedance. (c) make it unbalanced (d) none of the above. 39. The moving coil instrument can be used to measure (a) dc values only. (b) ac values only. (c) both dc and ac values. (d) none of the above. 40. As the frequency increases, the reactance of an inductor (a) decreases. (b) increases. (c) stays constant. (d) none of the above. 41. The power dissipation of the 1Ω resistor of the circuit shown is (a) 250mW (b) 500mW (c) 1W (d) 2W
5 42. The total power content of an AM signal is 100W and the percent modulation is 100%. The power transmitted by the carrier is (a) 33.33W (b) 66.67W (c) 16.66W (d) 100W 43. When antenna length is halved the resonant frequency (a) becomes half. (b) becomes double. (c) remains constant. (d) none of the above. 44. In the series RLC circuit at resonance the impedance is (a) zero. (b) minimum. (c) maximum. (d) infinity 45. The ionosphere layer which has a greatest effect on a radio signal is (a) D layer. (b) E layer. (c) F layer. (d) none of these layers. 46. What is the characteristic impedance of a transmission line which has a capacitance of 50 pf/m and an inductance of 0.5 µh/m? (a) 10Ω (b) 100Ω (c) 500Ω (d) 50Ω 47. A coil has a resistance of 5Ω and a reactance of 12Ω. The impedance is (a) 7Ω (b) 12Ω (c) 13Ω (d) 17Ω 48. The ratio detector is used for the detection of (a) CW signals. (b) SSB signals. (c) AM signals. (d) FM signals. 49. The value of the resistor shown in the figure is (a) 22Ω (b) 33Ω (c) 2200Ω (d) 3300Ω 50. The basic concept of FM is to vary the (a) amplitude of the carrier signal. (b) amplitude of the modulating sinal. (c) frequency of the carrier signal. (d) frequency of the modulating signal.
6 Answers for 1998 Basic Electronic. 1. c 2. a 3. b 4. a 5. c 6. a 7. a 8. b 9. b 10. c 11. b 12. d 13. d 14. a 15. a 16. a 17. c 18. b 19. b 20. a 21. c 22. c 23. d 24.?? 25. c 26.b 27. b 28. b 29. a 30. a 31. c 32. c 33. a 34. a 35. b 36. d 37. d 38. b 39. a 40. b 41. c 42. b 43. b 44. b 45. c 46. b 47. c 48. d 49. c 50. c Q-24 No correct answer. Answer is R/ L or CR Q-31 Unit is not mentioned for answers. Al four answers should be in Henrys.
7 Department of Examinations, Sri Lanka EXAMINATION FOR THE AMATEUR RADIO OPERATORS CERTIFICATE OF PROFICENCY ISSUED BY THE DIRECTOR GENERAL OF TELECOMMUNICATIONS OF SRI LANKA (1998) (NOVICE CLASS) Licencing Conditions, Operating Practices and Procedures One hour Index No : Answer al l questions on this paper itself. A minimum of 50 marks is required for a pass. Pick out the correct answer and underline it. 1. Q code abbreviation QRH means (a) What is the readability of my signal? (c) Will you tell me my exact frequency. 2. Q code abbreviation QSB means (a) Is my keying defective? (c) Are you being interfered with? (b) What is the tone of my transmission? (d) Does my frequency vary? (b) Are my signals fading? (d) Are you troubled by static? 3. Q code abbreviation QSL means (a) Can you give me acknowledgment of receipt (b) What is the strength of my signal? (c) Shall I change to another frequency? (d) Shall I send each word more than once? 4. Q code abbreviation QTR means (a) shall I send more slowly? (c) What is the correct time? (b) Shall I stop sending? (d) What is your location? 5. Decrease power is given by Q code (a) QRM (b) QRN (c) QRO (d) QRP 6. Send more slowly is given by Q code (a) QRQ (b) QRS (c) QRT (d) QRU 7. I am ready is given by Q code (a) QSV (b) QSY (c) QRU (d) QRV 8. Using voice modulation H3E correspond to (a) SSB with suppress carrier. (c) SSB with full carrier. (b) FM (d) DSB 9. Amplitude modulated single side band with suppressed carrier is denoted by (a) J3E (b) H3E (c) G3E (d) A3E 10. Using voice transmission A3E corresponds to (a) SSB (b) DSB (c) FM (d) PM
8 11. Abbreviation KN means (a) invitation to a particular station to transmit. (b) invitation to a any station to transmit. (c) starting signal. (d) end of message or communication. 12. Abbreviation for invitation to a any station to transmit is (a) KA (b) KN (c) K (d) AS 13. Abbreviation for end of message is (a) VA (b) KA (c) AS (d) AR 14. Which of the following types of messages can be transmitted over amateur radio? (a) Messages for a pecuniary reward. (b) Messages for a religious nature. (c) Messages on behalf of a third party. (d) Those of personal affairs. 15. The amateur radio equipment cannot be used for (a) transmitting advertisements (c) intercommunications. (b) technical investigations. (d) self training. 16. In amateur transmission it is not permissible to use (a) plain languages (b) phonetic alphabet (c) secret code (d) Q-code 17. Which of the following need not to be entered in the station log book. (a) Call sign of calling station (b) Call sign of the called station (c) Station operated at a temporary location (d) transmitter power 18. Which of the following represents a valid amateur station log? (a) In an exercise book (b) On a magnetic tape (c) On any electronic storage media (d) All the above are correct 19. Before initiating a CQ call (a) keep giving your call sign (c) send a series of Vs (b) listen on the frequency (d) All the above are correct. 20. Classes of emissions are designated by group of minimum of three characters. The third character (a) type of modulation of the main carrier. (b) nature of signal(s) which is used to modulate the main carrier. (c) type of information to be transmitted. (d) none of the above. 21. In the RST code T is for (a) time of transmission. (c) temperature of PA stage. (b) transmitter power. (d) tone.
9 22. During transmission, amateur stations are required to transmit their call sign at intervals of not Exceeding (a) 7 minutes (b) 5 minutes (c) 3 minutes (d) 2 minutes 23. Telegraphy by on-off keying of an amplitude modulated audio frequency for automatic reception by (a) A1B (b) A1A (c) A2B (d) A2A 24. The correct phonetic alphabet for the word GOLD is (a) Georg, Oscar, Lima, Delta (b) Golf, Oscar, Lima, David (c) Golf, Oscar, Lima, Delta (d) Golf, Oliver, Lima, David 25. The correct group using the international phonetic alphabet is (a) Alpha, Marry, Sarah, York (b) Alpha, Mary, Sierra, York (c) Alpha, Mike, Sarah, Yankee (d) Alpha, Mike, Sierra, Yankee Answers for 1998 Licencing conditions.. 1. d 2. b 3. a 4. c 5. d 6. b 7. d 8. c 9. a 10. b 11. a 12. c 13. d 14. d 15. a 16. c 17. d 18. a 19. b 20. c 21. d 22. b 23. c 24. c 25. d
1. henry is a unit of (a) Resistance (b) Inductance (c) Capacitance (d) Frequency
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