Q5. Describe - A. A safety lamp approved as part of slips statutory equipment LIFEBUOY SELF –IGNITING LIGHTS; B. A self-igniting lamp suitable for attachment to a lifebuoy; C. State the attention required to maintain them in a satisfactory working condition.
Q6. A. Define following terms with reference to alternating currents - Cycle; Time-period; Frequency; Peak factor
B. A heater unit of inductance has a resistance of 6.5 ohms and is intended for use with 100V mains. For what 50Hz voltage would it be suitable when placed in series with an external apparatus, of negligible resistance, having an inductance of 0.01H. If the frequency rises by 5 per cent and this voltage remains constant, what constant, what would be the resulting change or voltage at the heater terminals?
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