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12 Cards in this Set
- Front
- Back
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Electronic current is measured in |
C. Electronic current is measured in amperes. Capacitance is measured in farads. Voltage difference is measured in volts. Resistors are measured in ohms.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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A certain signal is carried on a radio signal by using the following electronic component: |
B. Signals are carried on other high frequency signals by frequency mixers.
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In a diode (PN Junction), the current flows |
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.
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A component of a parts list has the following specifications: "10 mH." The component specified is a |
C. A coil inductance is measured in henrys. Capacitance is measured in farads. Transistors have numbers to identify them. Resistance is measured in ohms.
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Electronic devices are grounded to |
B. Electronic devices are grounded to protect the user from an electric shock.
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