| 1. |
The ability of an antenna to radiate or receive more energy in some directions than in others is called _____________________. |
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Directivity |
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Diffraction |
| 2. |
Accelerating Anode is an electrode charged several thousand volts positive and used to accelerate electrons toward the front of a cathode-ray tube.
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True |
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False |
| 3. |
___________________ is an electrically excited magnet capable of exerting mechanical force or of performing mechanical work. |
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Electromagnet |
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Electrical field |
| 4. |
The current in an electrical circuit is directly proportional to the electromotive force in the circuit is known as _________________. |
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Ohm’s Law |
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Kirchhoff’s Law |
| 5. |
Hertz is a spirally wound transmission line used in a traveling-wave tube to delay the forward progress of the input traveling wave. |
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True |
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False |
| 6. |
Magnetic field is defined as a region in which the magnetic forces created by a permanent magnet or by a current-carrying conductor or coil can be detected. |
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True |
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False |
| 7. |
The difference between the highest usable frequency of a device (upper frequency limit) and the lowest usable frequency of the device (lower frequency limit) – measured at the half-power points is called ____________________. |
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Bandwidth |
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High frequency |
| 8. |
____________________ is a region in a semiconductor where essentially all free electrons and holes have been swept out by the electrostatic field which exists there. |
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Depletion region |
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Demodulator
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| 9. |
E-FIELD is an electric field that exists when a difference in electrical potential causes a stress in the dielectric between two points. |
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True |
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False |
| 10. |
_________________ is a term used to describe the total force exerted by an action-at-a-distance phenomenon such as gravity upon matter, electric charges acting upon electric charges, and magnetic forces acting upon other magnets or magnetic materials. |
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Field of force |
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Electric field |
| 11. |
Accelerometer is a device that measures the acceleration to which it is subjected and develops a signal proportional to it. |
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True |
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False |
| 12. |
BEARING Frequency is an ability of radar to distinguish between targets those are close together in bearing. |
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True |
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False |
| 13. |
A circuit that clamps the upper extremity of the output wave-shape to a dc potential of 0 volts is called as a ______________.
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Negative clamper |
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Positive clamper |
| 14. |
The algebraic sum of the current flowing towards any point in a circuit and the current flowing away from it is zero is called as ____________. |
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Kirchhoff’s law |
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Newton’s law |
| 15. |
The process of enlarging a signal in amplitude (as of voltage or current) is know as Input Impedance.
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True |
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False |
| 16. |
Characteristic impedance is the ratio of voltage to current at any given point on a transmission line represented by a value of impedance.
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True |
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False |
| 17. |
___________ is the current caused by the relative motion between a conductor and a magnetic field. |
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Induced Current |
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Eddy Current |
| 18. |
Generator is a machine that converts mechanical energy to electrical energy by applying the principle of magnetic induction. |
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True |
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False |
| 19. |
____________ is a filter, used on extremely high-voltage, low-current power supplies and also where the ripple frequency is not critical. |
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Capacitor filter |
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Dynamic filter |
| 20. |
__________ is an acronym for light amplification by stimulated emission of radiation.
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Laser |
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Eclipse |
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