![PEQWS_Mod08_Prob09_v06](http://s1.studyres.com/store/data/004342331_1-fb69f6c7e858aa87d21763506b4d14f5-300x300.png)
3-5 units Question Bank
... A. Finite B. Zero C. Medium D. None 16. ___ can be used to offset the +ve resistance of the resonator to produce oscillator. A. Passive reactance B. +ve resistance C. -ve resistance D. None 17. ____ is a device that resonates at resonant frequency with greater amplitudes. A. Amplifier B. Resonator C ...
... A. Finite B. Zero C. Medium D. None 16. ___ can be used to offset the +ve resistance of the resonator to produce oscillator. A. Passive reactance B. +ve resistance C. -ve resistance D. None 17. ____ is a device that resonates at resonant frequency with greater amplitudes. A. Amplifier B. Resonator C ...
Residual voltage on load side of an open circuit breaker
... The standards for switchgear do not recognize an open circuit breaker as an isolator. In an outdoor distribution circuit breaker situation, air disconnect switches should be located on each side of the circuit breaker to provide the isolation function before maintenance is performed. In a drawout, m ...
... The standards for switchgear do not recognize an open circuit breaker as an isolator. In an outdoor distribution circuit breaker situation, air disconnect switches should be located on each side of the circuit breaker to provide the isolation function before maintenance is performed. In a drawout, m ...
resistance questions
... c) If the hair dryer is used for 2 minutes, how many Joules of energy are used? A toaster with a resistance of 90.0 is connected to a 120V potential difference. a) What is the power used by the toaster? b) If the toaster is used for 5 minutes, how many Joules of energy are used? c) How much curren ...
... c) If the hair dryer is used for 2 minutes, how many Joules of energy are used? A toaster with a resistance of 90.0 is connected to a 120V potential difference. a) What is the power used by the toaster? b) If the toaster is used for 5 minutes, how many Joules of energy are used? c) How much curren ...
Specification for rigid coils
... with a resolution as low as 1mA and high currents of greater than 100kA. Rogowski coil sensors provide complete isolation from the circuit being measured and have no effect on the current being measured even for very low-impedance circuits. ...
... with a resolution as low as 1mA and high currents of greater than 100kA. Rogowski coil sensors provide complete isolation from the circuit being measured and have no effect on the current being measured even for very low-impedance circuits. ...
UNIT IV
... bands of frequencies and reject others. Reactive networks are available that will freely pass desired band of frequencies while almost suppressing other bands of frequencies. Such reactive networks are called filters. ...
... bands of frequencies and reject others. Reactive networks are available that will freely pass desired band of frequencies while almost suppressing other bands of frequencies. Such reactive networks are called filters. ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.