Technician pool, section T7D

Subelement T7

PRACTICAL CIRCUITS

Section T7D

Using basic test instruments: voltmeter, ammeter, and ohmmeter; Soldering

T7D01

Which instrument would you use to measure electric potential?

A.
An ammeter
Correct Answer
B.
A voltmeter
C.
A potentiometer
D.
An ohmmeter

T7D01

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T7D02

How is a voltmeter connected to a component to measure applied voltage?

A.
In series
Correct Answer
B.
In parallel
C.
In quadrature
D.
In phase

T7D02

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T7D03

When configured to measure current, how is a multimeter connected to a component?

Correct Answer
A.
In series
B.
In parallel
C.
In quadrature
D.
In phase

T7D03

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T7D04

Which instrument is used to measure electric current?

A.
An ohmmeter
B.
An electrometer
C.
A voltmeter
Correct Answer
D.
An ammeter

T7D04

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T7D05

How does an ohmmeter measure the resistance of a circuit or component?

Correct Answer
A.
By applying a small current and measuring the resulting voltage
B.
By placing a variable resistor in parallel with the circuit
C.
By placing a variable resistor in series with the circuit
D.
By applying a variable voltage and measuring the resulting current change

T7D05

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T7D06

Which of the following can damage a multimeter?

A.
Attempting to measure resistance using the voltage setting
B.
Failing to connect one of the probes to ground
Correct Answer
C.
Attempting to measure voltage when using the resistance setting
D.
Not allowing it to warm up properly

T7D06

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T7D07

Which of the following measurements are made using a multimeter?

A.
Signal strength and noise
B.
Impedance and reactance
Correct Answer
C.
Voltage and resistance
D.
All these choices are correct

T7D07

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T7D08

Which of the following types of solder should not be used for radio and electronic applications?

Correct Answer
A.
Acid-core solder
B.
Lead-tin solder
C.
Rosin-core solder
D.
Tin-copper solder

T7D08

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T7D09

What is the characteristic appearance of a cold tin-lead solder joint?

A.
Dark black spots
B.
A bright or shiny surface
Correct Answer
C.
A rough or lumpy surface
D.
A greenish tinge

T7D09

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T7D10

What reading indicates that an ohmmeter is connected across a large, discharged capacitor?

Correct Answer
A.
Increasing resistance with time
B.
Decreasing resistance with time
C.
Steady full-scale reading
D.
Alternating between open and short circuit

T7D10

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T7D11

Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?

A.
Ensure that the applied voltages are correct
Correct Answer
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

T7D11

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