PrepTest 47, Section 1, Question 8
A lighting control panel has exactly seven switches, numbered from 1 to 7. Each switch is either in the on position or in the off position. The circuit load of the panel is the total number of its switches that are on. The control panel must be configured in accordance with the following conditions:
A lighting control panel has exactly seven switches, numbered from 1 to 7. Each switch is either in the on position or in the off position. The circuit load of the panel is the total number of its switches that are on. The control panel must be configured in accordance with the following conditions:
A lighting control panel has exactly seven switches, numbered from 1 to 7. Each switch is either in the on position or in the off position. The circuit load of the panel is the total number of its switches that are on. The control panel must be configured in accordance with the following conditions:
A lighting control panel has exactly seven switches, numbered from 1 to 7. Each switch is either in the on position or in the off position. The circuit load of the panel is the total number of its switches that are on. The control panel must be configured in accordance with the following conditions:
If switch 1 is on, then switch 3 and switch 5 are off.
If switch 4 is on, then switch 2 and switch 5 are off.
The switch whose number corresponds to the circuit load of the panel is itself on.
If exactly two of the switches are on, then which one of the following switches must be off?
switch 3
switch 4
switch 5
switch 6
switch 7
Explanations
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