Electronics Engineering Interview Questions and Answers
Question - 11 : - What is the principle of microwave?
Answer - 11 : - Microwave essentially means very short wave. The microwave frequency spectrum is usually taken to extend from 1GHZ to 30GHZ. The main reason why we have to go in for microwave frequency for communication is that lower frequency band are congested and demand for point to point communication continue to increase. The propagation of the microwave takes place in spacewave in v
Question - 12 : - What is cut-off frequency?
Answer - 12 : - The frequency at which the response is -3dB with respect to the maximum response.
Question - 13 : - What is pass band?.
Answer - 13 : - Passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.
Question - 14 : - What is stop band?.
Answer - 14 : - A stopband is a band of frequencies, between specified limits, in which a circuit, such as a filter or telephone circuit, does not let signals through, or the attenuation is above the required stopband attenuation level.
Question - 15 : - Define Power Rating?
Answer - 15 : -
The power rating of a diode is defined as the maximum value of power that can be dissipated without failure if V f is the forward biased voltage and I f is the forward biased current.
Pd= V f x I f.
Question - 16 : - What is rheostat.
Answer - 16 : - Rheostat is a type of variable resistor which is used to control the flow of electric current by manually increasing or decreasing its resistance.
Question - 17 : - What is demodulation?.
Answer - 17 : - Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a modulated signal with specific characteristics and it needs to turn it to base-band.
Question - 18 : - Explain radio environment in building.
Answer - 18 : -
- Building penetration: Building penetration depends on the material used for construction and architecture used. This varies building to building and is based on building construction.
- Building Height Effect: The signal strength is always higher at top floor and generally floor gain height is about 2.7dB/floor which is not dependent on building construction.
- Building Floor Reception: The signal isolation between floors in a multi floor building is on the average about 20dB. Within a floor of 150 * 150 feet, the propagation loss due to interior walls, depending on the wall materials is about 20 dB between the strong and the weak areas.
Answer - 19 : -
A resistor is a two-terminal electronic component that opposes an electric current by producing a voltage drop between its terminals in proportion to the current, that is, in accordance with Ohm's law:
V = IR.
Question - 20 : - What is inductor?.
Answer - 20 : - An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms.