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Q. Consider an elementary three-phase, four-pole alternator with a wye-connected armature winding, consisting of full-pitch concentrated coils. Each phase
coil has three turns, and all the turns in any one phase are connected in series. The flux per pole, distributed sinusoidally in space, is 0.1 Wb. The rotor is driven at 1800 r/min.
(a) Calculate the rms voltage generated in each phase.
(b) If a voltmeter were connected across the two line terminals, what would it read?
(c) For the a-b-c phase sequence, take t = 0at the instant when the flux linkages with the a-phase are maximum.
(i) Express the three phase voltages as functions of time.
(ii) Draw a corresponding phasor diagram of these voltages with the a-phase voltage as reference.
(iii) Represent the line-to-line voltages on the phasor diagram in part (ii).
Consider the network shown in Figure containing a voltage-controlled source producing the controlled current i c = gv, where g is a constant with units of conductance, and the con
Q. What is the voltage gain? voltage gain is the ratio of output voltage to input voltage. It is represented as Av,vo-voltage output,Vi-voltage input,Ic-collector current,Ie
in DC series generator we consider Eg=V+Ia(Ra+Rse).But in DC shunt generator why it is only Eg=V+IaRa and not Eg=V+Ia(Ra*Rsh/Ra+Rsh)
Followings are the Disadvantages of PLC a.Too much work required in connecting wires. b.Difficulty with changes or replacements. c.Difficulty in finding errors requi
Flex Routing : You can see that your labour will have been in vain unless you take steps to ensure that flexes are routed safely and well clear of possible sources of danger.
A method used in advanced microprocessors where the microprocessor begins implementing a second instruction before the first has been done. That is, various instructions are in the
Compare memory mapped I/O with I/O mapped I/O. Memory Mapped I/O Scheme: In this type of scheme there is merely one address space. These address space is explained as all p
(a) Give three different ways how electro-magnetic interference can be reduced in twisted pairs based transmission. (b) Noise are unwanted signals affecting transmission. Lis
Spread Time (t s ) During spread time anode voltage falls from 10% I a to the on state voltage drop and anode current rises from 90% I a to final value of anode
Name the flag bits available in 8085 microprocessors. The 8085 microprocessor has five flags to show five different types of data conditions .they are zero(Z),carry(CY),Sig
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