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. Explain crossbar exchange, with all call processing steps and diagrams.
Ans:
The basic concept of crossbar switching is to provide a matrix of n x m sets of contacts with only n + m activators or less to select one of the n x m sets of contacts. This form of switching is also called coordinate switching as switching contacts are arranged in a x-y-plane. A diagrammatic representation of a cross point switching matrix is displayed in Figure. There is an array of vertical and horizontal wires displayed by solid lines. A set of vertical and horizontal contact points are connected to these wires. Contact points form pairs, each pair comprising a bank of three or four horizontal and a corresponding bank of vertical contact points. A contact point pair acts just like a cross point switch and remains separated or open when not in use. Contact points are mechanically mounted (and electrically insulated) on a set of vertical and horizontal bars displayed as dotted lines. The bars, in turn, are attached to a set of electromagnets.
When an electromagnetic energized, bar attached to it slightly rotates in such a way that contact points attached to bar move closer to its facing contact points but don't actually make any contact. Now if an electromagnet in the vertical direction is energized, corresponding bar rotates causing the contact points at the intersection of the two bars to close. This happens as the contact point's move towards each other. For example if electromagnets M2 and M3' are energized, a contact is established at cross point 6 such that subscriber B is connected to the subscriber C.
a) Write short notes on part feeding devices and transfer mechanism. b) Explain with example automation for machining operation with relevant diagrams. c) discuss different p
GIS Benefits: Improving financial viability. Reduction of T&D losses. Improving customer satisfaction. Raising reliability of power supply. Improving qual
Determine the total energy loss: Two capacitors C 1 = 50 μF and C 2 = 100 μF are connected in parallel across 250 V supply. Determine the total energy loss. Figure
What is the main function of dummy coul in winding?
field effect transistor as switch?
The manufacturer of a 6V dry-cell flashlight battery says that the battery will deliver 15 mA for 60 continuous hours. During that time the voltage will drop from 6V to 4V. Assume
Test Schedule - Meter Testing The test schedule as per the Central Electricity Authority Regulations on Installation and Operation of Meters is given below. Table: Test S
Determine the active - reactive and apparent power: In the given circuit, determine the active, reactive and apparent power. Figure Solution The inductive
Q. (a) Consider a three-phase star or wye half-wave recti?er with a purely resistive load R. Determine: (i) efficiency, (ii) formfactor, (iii) ripple factor, (iv) TUF, and (v) PIV
Q. What do you mean by Retention of Risk? Retention of Risk: In case of this method, the organization voluntarily accepts the risk since either the risk is insignificant or its
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd