Radio Serviceman's Examination
The Question Paper
Is response to requests, we are publishing the question paper set in the recently held Radio Serviceman’s | Examination. Prospective candidates of future examinations will no doubt be interested to prepare answers and compare with our versions as they appear from week to week. In section B we have dealt with questions 1 and 2 and this week discuss 3. Time allowed: 3 hours. The candidate must answer ail questions in Section A, and at least four in Section B. Section A: 1. What are the points to observe when connecting up a three-pin plug to connect a radio outfit to the eleztrical supply? . 2. If on connecting a radio set to the electrical supply you find there is no current at the set, what steps would you take to locate the cause? 8. How would you find out the Phase, Neutral and Marth terminals on 2 three-pin plug socket? 4. With regard to flexible cords between the wall socket and the radio set(a) What are the standard regulation colours for the live conductor, the neutral conductor and the earthing conductor in a three-core flexible cord? (b) State how you would lengthen a flexible cord. (c) State how you would install a flexible cord between a wall socket fixed on the skirting and a radio set. situated against the same wall but 10f£t. away. (a) Describe the kind of insulating material used on flexible cords, (e) Do the wiring regulations permit the use of twin twisted flexible cord for radio sets? (f) What class of covering is necessary where the cord is subject to hard usage? SECTION B. 1. Sketch and give details of a complete outdoor aerial-earth system showing the’ types and sizes of wire, stating any precautions you would take regarding electric power wires. 2, An owner complains that the londspeaker of his set will not handle a reasonable volume without distorting. Explain how you wouid go about curing the trouble(a) In the case of a battery operated set with magnetic speaker,
3. 4, J. 6. (db) In the case of a mains-oper-ated set with dynamic speaker. A fixed condenser is marked "Tested 500 volts D.C." State the highest voltages you would apply to it for continuous working. (a) In a battery operated amplifier, (b) If coupled across an A.C. circuit. Hxplain how you would arrive at these. values. Sketch the circuit diagram of a modern power pack, employing full wave valve rectification. You are called in to an A.C. set with a dynamic speaker and a gramo-pick-up. A bad A.C. hum is spoiling reception. Detail the steps you would take to check up the source and cure this hum. A 4 m.f.d. section of a power pack filter condenser is "blown." The voltage across it is 325, and the only condensers available are "259 volt D.C. working" of 4 m.f.d's. capacity. Show how these couid be used for the repair.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320115.2.36
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Radio Record, Volume V, Issue 27, 15 January 1932, Page 13
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488Radio Serviceman's Examination Radio Record, Volume V, Issue 27, 15 January 1932, Page 13
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