- 업종: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A voltage produced in the armature of an electric motor as the armature windings cut across the fixed magnetic field. The polarity of the CEMF is opposite the polarity of the voltage applied to the motor, and it opposes the applied voltage.
Industry:Aviation
A voltage regulator used with some high-output DC generators in which a stack of pure carbon disks acts as the resistance element in the field circuit. When the generator output voltage is low, a spring compresses the carbon pile and reduces its resistance, allowing a large amount of field current to flow.
When the generator output is high, the electromagnetic field produced by a voltage-sensing coil overcomes the spring force and loosens the carbon pile, increasing its resistance and decreasing the field current.
Industry:Aviation
A voltage used to oppose another voltage. When one voltage is bucked by another which has the same value but opposite polarity, the result is zero voltage.
Industry:Aviation
A voltmeter that has a high input impedance so that it does not load the circuit whose voltage is being measured. The voltage to be measured is impressed on the grid of a vacuum tube amplifier, and the resulting plate current is measured.
Vacuum-tube voltmeters (VTVM) are being replaced with solid-state field-effect transistor (FET) voltmeters.
Industry:Aviation
A voltmeter whose meter movement requires very little current for full-scale deflection. Most high-impedance voltmeters have a sensitivity of at least 20,000 ohms per volt, and when a very-high-impedance voltmeter is needed, vacuum-tube or FET voltmeters are used. The sensitivity of these meters is measured in megohms per volt. High-impedance voltmeters do not load the circuit, which would give erroneous reading when voltage is measured across a high resistance.
Industry:Aviation
A volume of air small enough to contain uniform distribution of its meteorological properties, and large enough to remain relatively self-contained and respond to all meteorological processes. No specific dimensions have been defined for a parcel; however, the order of magnitude of one cubic foot has been suggested.
Industry:Aviation
A warm, dry wind that blows down the eastern slopes of the Rocky Mountains in the United States.
The air in a chinook lost most of its moisture as it blew up the western slopes of the mountains, and it is dry and warm as it blows down the eastern slopes.
Industry:Aviation
A warning device incorporated in certain airborne navigation and flight instruments indicating that instruments are inoperative or otherwise not operating satisfactorily, or that signal strength or quality of the received signal falls below acceptable values.
Industry:Aviation
A warning device that signals the presence of a problem by emitting a signal that can be heard.
Industry:Aviation
A warning light, whose proper name is nondiscrete indicator, used instead of an indicating instrument. Some aircraft have “idiot lights” rather than ammeters, to alert the pilot when the generator is not producing adequate voltage. Other idiot lights indicate such conditions as low oil pressure and cabin heater malfunctions.
Industry:Aviation
