Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Write a short note on the frequency response of a R-C coupled amplifier.
At low frequencies (<50Hz), the reactance of coupling capacitor Cc is quite high and hence very small part of signal will pass from one stage ot the next stage. Moreover, Ce cannot shunt the emitter resistance Re effectively because of its large reactance at low frequencies. These two factors cause a falling of voltage gain at low frequencies.
At high frequencies (>20KHz), the reactance of Cc is very small and it behaves as a short circuit. This increases the loading effect of next stage serves to reduce the voltage gain. Moreover, at high frequency, capacitive reactance of base-emitter junction is low which increases the base current. This reduces the current amplification factor b. Due to these reasons, the voltage gain drops off at high frequency.
At mid-frequencies (50Hz to 20KHz), the voltage gain of the amplifier is constant. The effect of coupling capacitor in this frequency range is such so as to maintain a uniform voltage gain. Thus, as the frequency increases in this range, reactance of Cc decreases which tends to increase the gain. However, at the same time, lower reactance means higher loading of first stage and hence lower gain. These factors almost cancel each other, resulting in a uniform gain at mid frequency.
Third Generation ( 1964- 1982 ) Invention of technology of integrated circuits created computers of third generation. In several logical gates are fabricated on a singl
The vectors we will use we be refered to right-handed Cartesian axes. Right handed means that the x,y,z axes are oriented in a particular way (which you must know). See diagrams
Define HRQ? The hold demand output requests the access of the system bus. In non- cascaded 8257 systems, this is linked with HOLD pin of CPU. In cascade mode, this pin of a sla
Explain Stator of a Synchronous Machine? The stator of a synchronous machine is made of thin laminations of highly permeable (silicon) steel in order to reduce the core losses.
With the use of clocked JK flip-flops, draw and explain the working principle of a 3-bit binary ripple counter.
1. The circuit shown below is a DC charging and discharging circuit. a. At t = 0 sec, switch S1 is thrown to position 1 ("pos1"). Write the mathematical expressions for V
10. List the three ways in which an RTOS handles ISRs in a multitasking environment
A three-phase, 5-hp, 220-V, six-pole, 60-Hz in- duction motor runs at a slip of 0.025 at full load. Rotational and stray-load losses at full load are 5% of the output power. Calcul
Q. Define wireless communications? The latest wireless communications technology is the personal satellite phone. The coverage is planetary and one can reach anywhere on earth.
Q. Define Resistance in lumped-circuit? An ideal resistor is a circuit element with the property that the current through it is linearly proportional to the potential differenc
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd