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
The Question Pool
[edit | edit source]Question 1
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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
[edit | edit source]- 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.