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Q. Tone used in stronger telephony?
Dial Tone: This tone is used to specify that exchange is ready to accept dialled digits from subscriber. Subscriber must start dialling only after hearing the dialing tone. A number of times, though, a few seconds may elapse before the dial tone is heard. This occurs specifically in common control exchanges that use shared resources for user interfaces. Dial tone is a 33 Hz or 50 Hz or 400 Hzcontinuous tone as demonstrated in Figure. 400 Hz signal is generally modulated with 25 Hz or 50 Hz.
SBB Instruction This instruction is used to subtract the contents of register or memory location with carry flag from accumulation. The results of operations is stored
Traffic Light Display Design a three color LED system with the following times for each LED: Duration of Green signal : 16s Duration of Yellow signal : 1s Duration of R
Q. Explain the basic architecture of digital switching systems. Explain in detail companding. Ans: A simple N X N time division space switch is displayed in Figure. Switch
Q. A shift register can be used as a binary (a) divide by-2, and (b) multiply-by-2 counter. Explain. Show a block diagram of a 4-bit shift-right register using JKFFs.
Precautions to be taken in carrying out repairs on HT and LT switch gear? Ans: The following precautions to be taken in carrying out repairs on LT and HT switch gears. a
Q. A practical current source is represented by an ideal current source of 200 mA along with a shunt internal source resistance of 12 k. Determine the percentage drop in load curr
Considering the circuit shown in Figure (a), find the state of operation and operating point if the BJT has β = 80 and other typical values of a silicon BJT at room temperature.
Construction - UniJunction Transistor: Construction: The basic structure of uni junction transistor is shown in fig. (a). It essentially consists of a lightly doped N type s
Q. A silicon diode is forward-biased with V = 0.5 V at a temperature of 293 K. If the diode current is 10 mA, calculate the saturation current of the diode.
Rise Time (t r ) During rise time voltage falls from 90% V a to 10% where V a where V a is the initial anode voltage. In terms of current time taken by anode curre
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