FCC Technician Class Exam Study Guide - 2014-2018/Subelement T7 Group D

Basic repair and testing: soldering; using basic test instruments; connecting a voltmeter, ammeter, or ohmmeter

Question 1

 * Which instrument would you use to measure electric potential or electromotive force?
 * A. An ammeter
 * B. A voltmeter
 * C. A wavemeter
 * D. An ohmmeter

The correct answer is B.

Question 2

 * What is the correct way to connect a voltmeter to a circuit?
 * A. In series with the circuit
 * B. In parallel with the circuit
 * C. In quadrature with the circuit
 * D. In phase with the circuit

The correct answer is B.

Question 3

 * How is an ammeter usually connected to a circuit?
 * A. In series with the circuit
 * B. In parallel with the circuit
 * C. In quadrature with the circuit
 * D. In phase with the circuit

The correct answer is A.

Question 4

 * Which instrument is used to measure electric current?
 * A. An ohmmeter
 * B. A wavemeter
 * C. A voltmeter
 * D. An ammeter

The correct answer is D.

Question 5

 * What instrument is used to measure resistance?
 * A. An oscilloscope
 * B. A spectrum analyzer
 * C. A noise bridge
 * D. An ohmmeter

The correct answer is D.

Question 6

 * Which of the following might damage a multimeter?
 * A. Measuring a voltage too small for the chosen scale
 * B. Leaving the meter in the milliamps position overnight
 * C. Attempting to measure voltage when using the resistance setting
 * D. Not allowing it to warm up properly

The correct answer is C.

Question 7

 * Which of the following measurements are commonly made using a multimeter?
 * A. SWR and RF power
 * B. Signal strength and noise
 * C. Impedance and reactance
 * D. Voltage and resistance

The correct answer is D.

Question 8

 * Which of the following types of solder is best for radio and electronic use?
 * A. Acid-core solder
 * B. Silver solder
 * C. Rosin-core solder
 * D. Aluminum solder

The correct answer is C.

Question 9

 * What is the characteristic appearance of a cold solder joint?
 * A. Dark black spots
 * B. A bright or shiny surface
 * C. A grainy or dull surface
 * D. A greenish tint

The correct answer is C.

Question 10

 * What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?
 * A. The ohmmeter is defective
 * B. The circuit contains a large capacitor
 * C. The circuit contains a large inductor
 * D. The circuit is a relaxation oscillator

The correct answer is B.

Question 11

 * Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?
 * A. Ensure that the applied voltages are correct
 * B. Ensure that the circuit is not powered
 * C. Ensure that the circuit is grounded
 * D. Ensure that the circuit is operating at the correct frequency

The correct answer is B.

Question 12

 * Which of the following precautions should be taken when measuring high voltages with a voltmeter?
 * A. Ensure that the voltmeter has very low impedance
 * B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
 * C. Ensure that the circuit is grounded through the voltmeter
 * D. Ensure that the voltmeter is set to the correct frequency

The correct answer is B.