Subelement T7 Group D

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.