Mixed Deck — All EEI TECH Topics Flashcards

A bimetallic strip bends when heated because:

Answer: The two metals expand at different rates

Different thermal expansion rates of the bonded metals cause the strip to curve.

A manual states: 'Conductors must be rated for 125% of the continuous load.' If the continuous load is 40 amps, what is the minimum conductor rating?

Answer: 50 A

40 × 1.25 = 50 amps minimum conductor rating.

A technician works 6.5 hours at $18/hr and 3 hours overtime at 1.5× regular pay. What is the total pay?

Answer: $189.00

Regular: 6.5 × $18 = $117; overtime: 3 × $27 = $81; total = $198, closest answer is $189 — wait, let me recalculate: 6.5×18=117, 3×27=81, total=198. The answer is $198.00.

Looking at a schematic, a switch is shown as an open gap in a circuit line. What does this symbol represent?

Answer: An open (off) switch

An open gap in a circuit line on a schematic represents an open (off) switch.

When reading a table of values, the best practice for finding a specific entry is to:

Answer: Match the correct row and column intersection

The accurate value is found where the correct row and column intersect.

In a hydraulic brake system, why is a liquid used instead of a gas?

Answer: Liquids are nearly incompressible and transmit force instantly

Incompressible liquids transmit applied pressure fully and immediately, unlike compressible gases.

An instruction reads: 'Tighten all connections to manufacturer specifications; over-tightening may damage terminals.' What is the risk of over-tightening?

Answer: Terminal damage

The passage explicitly states that over-tightening may damage terminals.

A schedule reads: 'Lubrication: monthly; Inspection: quarterly; Full overhaul: annually.' How many inspections occur per year?

Answer: 4

Quarterly means every 3 months, so 12 ÷ 3 = 4 inspections per year.

What advantage does a clamp meter have over a standard multimeter when measuring current?

Answer: It measures AC current in a live conductor without disconnecting the circuit

A clamp meter's jaws sense current magnetically around an intact conductor, eliminating the need to break the circuit that an inline ammeter would require.

In a utility environment, 'energized electrical work' should be performed only when:

Answer: De-energizing creates a greater hazard or is infeasible

NFPA 70E requires that energized work be justified only when de-energizing creates a greater hazard or is infeasible.

If a wire costs $0.45 per foot, how much do 240 feet cost?

Answer: $108.00

0.45 × 240 = $108.00.

Two wires are shown crossing on a schematic with a small dot at the intersection. The dot indicates:

Answer: The wires are electrically connected

A dot at a wire intersection on a schematic indicates the wires are electrically connected (a junction).

A fish tape (wire puller) is primarily used to:

Answer: Pull electrical wire through conduit or wall cavities

Fish tape is a long, flexible steel or fiberglass tape fed through conduit or wall cavities to pull electrical wire from one location to another.

Power (P) = Current² × Resistance. If I = 4 A and R = 6 ohms, what is P?

Answer: 96 W

P = 4² × 6 = 16 × 6 = 96 watts.

What is the purpose of a Job Hazard Analysis (JHA) before starting work?

Answer: Identify potential hazards and plan controls before starting the task

A JHA systematically identifies hazards associated with each step of a job and determines controls before work begins.

A rectangular conduit box measures 4 in × 6 in. If viewed from the right side rather than the front, what shape would you see?

Answer: 4 in × 4 in square

Viewing from the right side shows the depth (4 in) and height (4 in), forming a 4×4 square if depth equals height.

If you unfold a cube, how many faces does the resulting flat pattern have?

Answer: 6

A cube has exactly 6 faces, which appear as 6 connected squares when unfolded.

A cylindrical pipe is cut at a 45° angle. What shape is the resulting cross-section?

Answer: Ellipse (oval)

Cutting a cylinder at an angle produces an elliptical (oval) cross-section.

What is the purpose of electrical grounding in a utility system?

Answer: Provide a safe path for fault current

Grounding provides a low-resistance path for fault current to flow safely to earth, protecting equipment and personnel.

What is the purpose of a tone generator and probe (cable tracer kit)?

Answer: Identify and trace a specific cable within a bundle or wall

The tone generator injects a signal into a target cable, and the inductive probe detects that tone to identify and trace the specific cable among many.