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146 lines
2.7 KiB
Plaintext
146 lines
2.7 KiB
Plaintext
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% FILENAME = N10.TXT
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% Safety
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% Release version 2, January 2000
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%Question: 1
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#10.1 You can safely remove an unconscious person from contact with a high
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voltage source by:
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pulling an arm or a leg
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wrapping the person in a blanket and pulling to a safe area
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calling an electrician
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turning off the high voltage and then removing the person
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% ans 4
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%Question: 2
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#10.2 For your safety, before checking a fault in a mains operated power supply
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unit, first:
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short the leads of the filter capacitor
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turn off the power and remove the power plug
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check the action of the capacitor bleeder resistance
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remove and check the fuse in the power supply
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% ans 2
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%Question: 3
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#10.3 Wires carrying high voltages in a transmitter should be well insulated to
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avoid:
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short circuits
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overheating
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over modulation
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SWR effects
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% ans 1
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%Question: 4
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#10.4 A residual current device is recommended for protection in a mains power
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circuit because it:
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reduces electrical interference from the circuit
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removes power to the circuit when the phase and neutral currents are not equal
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removes power to the circuit when the current in the phase wire equals the
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current in the earth wire
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limits the power provided to the circuit
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% ans 2
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%Question: 5
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#10.5 An earth wire should be connected to the metal chassis of a
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mains-operated power supply to ensure that if a fault develops, the chassis:
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does not develop a high voltage with respect to earth
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does not develop a high voltage with respect to the phase lead
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becomes a conductor to bleed away static charge
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provides a path to ground in case of lightning strikes
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% ans 1
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%Question: 6
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#10.6 The purpose of using three wires in the mains power cord and plug on
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amateur radio equipment is to:
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make it inconvenient to use
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prevent the chassis from becoming live in case of an internal short to the
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chassis
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prevent the plug from being reversed in the wall outlet
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prevent short circuits
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% ans 2
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%Question: 7
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#10.7 The correct colour coding for the phase wire in a flexible mains lead is:
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brown
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blue
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yellow and green
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white
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% ans 1
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%Question: 8
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#10.8 The correct colour coding for the neutral wire in a flexible mains lead
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is:
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brown
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blue
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yellow and green
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white
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% ans 2
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%Question: 9
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#10.9 The correct colour coding for the earth wire in a flexible mains lead is:
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brown
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blue
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yellow and green
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white
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% ans 3
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%Question: 10
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#10.10 An isolating transformer is used to:
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ensure that faulty equipment connected to it will blow a fuse in the
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distribution board
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ensure that no voltage is developed between either output lead and ground
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ensure that no voltage is developed between the output leads
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step down the mains voltage to a safe value
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% ans 2
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