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12 Cards in this Set

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Electronic current is measured in

A. farads.
B. volts.
C. amperes.
D. ohms.
C. Electronic current is measured in amperes. Capacitance is measured in farads. Voltage difference is measured in volts. Resistors are measured in ohms.
A voltmeter is a device used for measuring

A. electrical current.
B. electrical charge.
C. energy.
D. difference in voltage.
D. A voltmeter is a device used to measure the difference in voltage. An ammeter is used to measure electrical current. Electrical charge or energy cannot be measured by a voltmeter.
Leather gloves must be used when

A. working with low-power transistors.
B. working with live high-voltage devices.
C. testing low-power DC circuits.
D. designing a low-power circuit.
B. Leather gloves withstand high voltage.
An AM radio signal is

A. amplitude modulated.
B. frequency modulated.
C. phase modulated.
D. DC modulated.
A. An AM modulated signal is an amplitude modulated signal. FM signals are frequency modulated signals. PSK signals are phase modulated signals. DC cannot be used for modulation.
In order to protect an electric circuit, the following component can be used:

A. a fuse
B. a capacitor
C. an inductor
D. an ammeter
A. In order to protect an electric circuit, a fuse can be used. Once the current rating is higher than the fuse rating, the fuse will break, preventing the flow of current.
A signal is transmitted wirelessly by carrying it on

A. a square wave.
B. a DC signal.
C. a triangular wave.
D. a high-frequency sinusoidal wave.
D. A signal is transmitted by being carried on a high frequency sinusoidal signal called a carrier signal.
The signal s(t) = 10 sin (120pt) has the following amplitude and frequency, respectively:

A. 5 V and 120 Hz
B. 10 V and 60 Hz
C. 10 V and 120 Hz
D. 5 V and 60 Hz
B. The signal s(t) can be written in the form s(t) = amplitude × sin(2pft), so that the amplitude is 10 V and the frequency is 60 Hz.
An ohmmeter is a device used to measure

A. resistance.
B. voltage.
C. power.
D. current.
A. An ohmmeter is a device used to measure resistance. A voltmeter is used to measure a voltage difference. A wattmeter is used to measure power, and an ammeter is used to measure current.
A certain signal is carried on a radio signal by using the following electronic component:

A. resistor
B. mixer
C. capacitor
D. on-off switch
B. Signals are carried on other high frequency signals by frequency mixers.
In a diode (PN Junction), the current flows

A. from anode to cathode.
B. from cathode to anode.
C. in both directions.
D. when voltage is below threshold.
A. A diode permits the flow of the current in one direction only: from the anode to the cathode, when the voltage applied is greater than the threshold level.
A component of a parts list has the following specifications: "10 mH." The component specified is a

A. capacitor.
B. transistor.
C. coil.
D. resistor.
C. A coil inductance is measured in henrys. Capacitance is measured in farads. Transistors have numbers to identify them. Resistance is measured in ohms.
Electronic devices are grounded to

A. reduce the cost.
B. protect the user.
C. reduce the power dissipation.
D. enhance performance.
B. Electronic devices are grounded to protect the user from an electric shock.