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Q. Working of On - off hook circuit in telephone hand set?
On/off hook circuit (sometimes termed as a switch hook) is nothing more than a simple single-throw, double-pole (STDP) switch placed across tip and ring. Switch is mechanically connected to telephone handset so that when telephone is idle (on hook), switch is open. When telephone is in use (off hook), switch is closed completing and electrical path through microphone between tip and ring of local loop.
what is the necessity of copper brushes in dc motors?
Actuators These devices convert electromagnetic energy to mechanical energy to produce intermittent mechanical movement (e.g. opening a valve in a central heating system or c
Q. Show the Overall output limitations of Speed Control? The overall output limitations are as shown in Figure. With base speed defined as the full-field speed of themotor at t
objective ?
XTHL Exchange top of the stack with HL Instruction The contents of top two location of the stack are exchanged with the contents of HL register pair. The contents of reg
Explain the effect of temperature on the resistivity of conducting materials. The resistance of most metals rises with rise of temperature whereas that of semiconductors and el
Total Debt to Total Assets ratio A metric used to measure a company's financial risk by determining how much of the company's assets have been financed by debt. It is calculat
How DRAM's are different from SRAM's? Why DRAMs are said to use address multiplexing? Ans Dynamic RAM (DRAM) is basically the same as SRAM except that it recollects data f
NPN BJT with forward-biased: An NPN transistor can be referred as two diodes along with a shared anode. In common operation, the base-emitter junction is forward biased and th
Q. A semiconductor diode with IS = 10µA and a 1-k resistor in series is forward-biased with a voltage source to yield a current of 30mA. Find the source voltage if the diode I-V e
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