Free NOCTI Applied Electrical Questions and Answers

Question 1

If resistance remains the same and voltage is doubled in an AC circuit, then the current is _________.

Accepted Answer

Doubled

Answer

According to Ohm's Law (I = V/R), current is directly proportional to voltage when resistance is constant. If voltage doubles and resistance stays the same, current must also double. Quadrupling would only occur if voltage increased fourfold; halving would require voltage to decrease by half.

Question 2

Prior to inning the tip with silver, the tip should be ______.

Accepted Answer

Wiped clean

Answer

Before tinning a soldering iron tip with solder or silver, the tip must be wiped clean to remove oxidation, old solder, and debris. A contaminated tip prevents proper heat transfer and causes poor solder joints. The other options — covering, running a full cycle, or flushing with saline — are not standard soldering preparation steps.

Question 3

Which resistor will dissipate the least power when 2 resistors are parallel?

Accepted Answer

Larger Value Resistor

Answer

In a parallel circuit, voltage is the same across both resistors, so power dissipation is calculated as P = V²/R. A larger resistance value produces less power dissipation because power and resistance are inversely related at constant voltage. The smaller resistor carries more current and dissipates more power.

Question 4

Every digital multimeter can measure 3 basic things: current, voltage, and ___________.

Accepted Answer

Resistance

Answer

Every digital multimeter (DMM) measures the three fundamental electrical quantities: voltage, current, and resistance. Resistance is the opposition to current flow, measured in ohms. An ammeter is a separate instrument, a resistor is a component, and isolation is not a basic DMM measurement.

Question 5

Measure a current with this instrument.

Accepted Answer

Ammeter

Answer

An ammeter is the instrument specifically designed to measure electrical current in a circuit. It must be connected in series so all current flows through it. A voltmeter measures voltage (connected in parallel), a resistor is a component not an instrument, and an ampere is a unit of measurement, not an instrument.

NOCTI - National Occupational Competency Testing Institute Practice Test

NOCTI - National Occupational Competency Testing Institute Practice Test

Free NOCTI Applied Electrical Questions and Answers