Q9. (a)Sketch a circuit diagram of a self-excited a.c. generator.(5)
(b)Describe the operation of the circuit sketched in part (a).(5)
Q10. With reference to the protection of High Voltage electric a.c. motors:
(a) state the type of fuses that are fitted and how they prevent single phasing; (3)
(b) describe the operation of EACH of the following direct temperature sensors:
(i) resistance temperature device; (3)
(ii) thermistor. (4)
Q11. Explain the meaning of EACH of the following types of electrical equipment:
(i) intrinsically safe; (2) (ii) flameproof; (2)
(iii) increased safety; (2) (iv) pressurised enclosure. (2)
(b) State the electrical tests for equipment in hazardous areas, describing the safety precautions. (4)
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