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Q. Designing 100 line exchange using Uni-selector?
Here three different designing methods for 100 line exchange are discussed:
Design: Strowger switching system is designed using one two-motion selector for each subscriber. A subscriber is assigned a number in the range 00-99 and same number is used to identify two-motion selector assigned to him. 100 outlets of each two-motion selector are numbered as per the scheme given in table. Corresponding outlets in all the 100 two-motion selectors are commoned and folded back to corresponding inlets. For illustration a subscriber with 87 as his number is assigned two-motion selector 87. Outlet 87 which corresponds to this subscriber is connected to 7th contact in the 8th vertical position of all two-motion selectors and folded back to his inlet. Arrangement is demonstrated in figure. If subscriber 23 dials 87, his two motion selector 23 would step vertically 8 times corresponding to first digit and would step horizontally 7 times to reach contact to which the subscriber 87 is connected. This switch is non- blocking and uses only one stage of switching elements. As two-motion selector is activated by calling party, call is terminated only when the calling party disconnects the line. If a two-motion selector goes out of order, subscriber connected to it won't be able to make any outgoing calls though can receive incoming calls. Design parameters of this switch are:
S =100, SC =50, K = 1, TC =1,
EUF = 0.5, C= 200, CCI =25, PB =0.
The critical temperature above which the ferromagnetic materials lose their magnetic property is known as (A) Hysteresis. (B) Curie point.
Single Phase Full Wave Controlled rectifier The single phase half wave controlled rectifier produce only one pulse of load current during one cycle of supply voltage
few
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(a) Identify the semiconductor type in the above diagram. (b) Explain the mechanism of generation of the voltage V AB in the above diagram. (c) An experimental setup like th
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