Mock tests

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The insulation resistance (IR) to the earth of a new galley hot - plate is measured to be 30MΩ. when three identical hot - plates are tested together their combined IR will be : 10MΩ 3MΩ 30MΩ 90MΩ

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Why is copper often used as an electrical conductor? has high resistance at low temperatures has a highly polished surface is able to pass current with little opposition holds insulation together well

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A circuit that has a conductor in electrical contact with the hull is known as a Grounded circuit Short circuit Series circuit Closed circuit

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An insulation resistance reading is taken at 20°C and found to be 10 MΩ. What would you expect the resistance reading to be at 40°C? 2.5MΩ 10MΩ 15MΩ 20MΩ

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An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading and date of test, what information listed below should be entered in the electrical log? The maximum allowable operating temperature of the machine The temperature of the machine at the time the resistance reading was taken The normal temperature rise of the machine The complete name plate data from the resistance test instrument used to obtain the reading

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Internal resistance is placed in series with the meter movement of which of the following instruments? AC Ammeter DC Ammeter DC Voltmeter AC Frequency meter

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Compared to the original wire, what will be the resistance of a replacement wire having twice the length and done-half the cross-sectional area of the original? four times that of the original wire twice that of the original wire the same as that of the original wire one-half that of the original wire

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If a cable length 100m, dia 1.25mm has a resistance of 30Ω, what length cable of the same material with dia 0.75mm has a resistance of 25Ω? 30 metres 20 metres 15 metres 25 metres

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How are the line losses in a distribution circuit kept to a minimum? Adding rubber insulation conductors to the circuit Using higher current and lower voltage Increasing the number of thermal relays in the circuit Using higher voltage and Lower current

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Concerning modern 13A square pin electric plugs which of the following statement is true? The live wire is coloured blue The neutral wire is coloured brown The earth wire goes to the centre top connection The fuse is at the neutral connection

Mock test for Electrical Cadets & Class IV – Basic Electricity (Part-3)

Mock test for Electrical Cadets & Class IV – Basic Electricity (Part-2)

Mock test for Electrical Cadets & Class IV – Basic Electricity (Part-1)

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