5.B] How back emf regulates the armature current in a D.C. Motor? Explain with relevant equations. When the Armature of D C motor starts rotating and the armature conductor cuts…
5.A] Explain the principle of operation and construction of a dc generator. Working principle of D.C.Machine as a generator: It is based on the principle of dynamically induced e.m.f .…
3.C] Deduce the relationship between the phase and the line voltages of a three-phase star-connected system. Consider a balanced star-connected load as shown in fig. The three phase voltages are…
4.A] Develop an equation for the power consumed by an R-L series circuit. Draw the waveforms of voltage, current, and power. Answer:- Circuit draws a current I then there are…
3.A) Demonstrate that two wattmeters are sufficient to measure power in a three-phase balanced star-connected circuit with the help of a neat circuit diagram and phasor diagram. Answer;– If W1…
2.C]Justify why pure inductor does not consume any power when connected across single phase A.C. supply? Answer:-
2 b] A circuit consisting of 12Ω, 18 Ω and 36 Ω respectively, joined in parallel, is connected in series with a fourth resistance. The whole is supplied at 60V…
2.A]Define R.M.S value of alternating current. Show that its value is proportional to maximum value. Definition: The effective or RMS value of an alternating quantity is that steady current (dc)…
1.C]The equation for an AC voltage is given as V= 0.04sin (2000t+600) volts. Determine the frequency angular frequency and instantaneous voltage when t=160μs. Solution: Given: v =0.04 sin(2000t +600) ——-…
1B]Prove that the circuit efficiency during maximum power transfer from source to load is only 50%.
