Aptitude Test Reading Comprehension Skills Questions and Answers Flashcards

Passage: 'Arc fault circuit interrupters (AFCIs) detect the electrical signature of arc faults — dangerous sparking in wiring caused by damaged or worn insulation. AFCIs are required in sleeping areas, living rooms, and other areas of dwelling units per the NEC. Unlike GFCIs, which protect against shock, AFCIs primarily protect against fire.' What is the primary protection offered by AFCIs?

Answer: Protection against arc faults and fire

The passage states AFCIs 'detect the electrical signature of arc faults' and 'primarily protect against fire.'

Passage: 'Motor nameplate data includes rated voltage, full-load amperes (FLA), horsepower, RPM, and service factor. The service factor (SF) indicates how much above rated load a motor can operate for short periods without damage. A motor with SF = 1.15 can handle 15% overload temporarily.' What does a service factor of 1.15 mean?

Answer: The motor can temporarily handle 15% above its rated load

The passage states SF=1.15 means the motor 'can handle 15% overload temporarily.'

Passage: 'Electrical panels must have sufficient working clearance in front of them — typically 36 inches minimum per the NEC. This space allows electricians to work safely and facilitates emergency access to shut off power. Obstructing this space with storage is a common code violation.' Why is clearance in front of panels required?

Answer: For safe working space and emergency power shutoff access

The passage states clearance is required for electricians 'to work safely' and to facilitate 'emergency access to shut off power.'

Passage: 'Transformer polarity refers to the relative instantaneous voltage polarities of the primary and secondary windings. Additive polarity means the secondary voltage aids the primary voltage. Subtractive polarity means the secondary voltage opposes the primary voltage. Knowing polarity is critical when connecting transformers in parallel or in banks.' When is knowing transformer polarity most critical according to the passage?

Answer: When connecting transformers in parallel or in banks

The passage states polarity knowledge is 'critical when connecting transformers in parallel or in banks.'

Passage: 'Wire pulling lubricant reduces friction when pulling wire through conduit runs. Using lubricant is especially important in long runs and conduit with many bends, where friction is highest. Lubricants must be compatible with the wire's insulation material to avoid damage.' What does the passage say about choosing lubricant?

Answer: Lubricant must be compatible with the wire insulation material

The passage states: 'Lubricants must be compatible with the wire's insulation material to avoid damage.'

Passage: 'Voltage drop occurs when current flowing through a conductor encounters resistance, causing a reduction in voltage at the end of the circuit. The NEC recommends limiting voltage drop to 3% for branch circuits and 5% for feeders and branch circuits combined. Excessive voltage drop causes equipment to operate below rated performance.' What is the NEC's recommendation for voltage drop on branch circuits only?

Answer: 3%

The passage states: '3% for branch circuits' is the NEC recommendation.