QUESTION 1
a) The coil of generator is wounded with 100 turns on a square form. The mean area per turn is 1.6 imes 10^(-3) meter square. The coil is required to rotate in a uniform magnetic field of density 1.2T and the generated maximum of e.m.f equal to 40V.
i) Determine the speed of prime mover in revolution per minute (rpm) required to achieve the above specification.
ii) Determine the expression of e.m.f induced in the coil.
iii) Calculate the instantaneous value of e.m.f at t=0.1s
b) In the particular AC circuit with frequency 50Hz, given v(t)=25sin(omega t+27deg )V and i(t)=4.5sin(omega t-12deg )A. Based on this expression of voltage and current,
i) Sketch the waveforms of v(t) and i(t) in the single diagram/graph
ii) Sketch the phasor diagram of v(t) and i(t) in the single diagram/graph
iii) Calculate the V_(p-p),V_(ave ),V_(rms )&I_(p-p),I_(ave ),I_(rms)
iv) Determine the phase relationships
v) Determine the magnitude and phase angle of circuit impedance
vi) Determine the instantaneous value of v(t) and i(t) at t=0.5 seconds. Calculate the phase angle, heta at t=0.5 seconds
QUESTION1
a The coil of generator is wounded with 100 turns on a square form. The mean area per turn
is 1.6 x 10-3 meter square. The coil is required to rotate in a uniform magnetic field of density
1.2 T and the generated maximum of e.m.f equal to 40V.
i)
Determine the speed of prime mover in revolution per minute (rpm) required to
achieve the above specification
ii) iii)
Determine the expression of e.m.f induced in the coil.
Calculate the instantaneous value of e.m.f at t=O.ls
b) In the particular AC circuit with frequency 50Hz, given v(t)=25sin(t+27V and
it)=4.5sin(t -12)A.Based on this expression of voltage and current,
i) ii)
Sketch the waveforms of v(t) and i(t)in the single diagram/graph
Sketch the phasor diagram ofv(t) and i(t) in the single diagram/graph
iii) iv) v) vi)
Calculate the Vp-p, Vave,Vrms & Ip-p, Iave, Irms
Determine the phase relationships
Determine the magnitude and phase angle of circuit impedance
Determine the instantaneous value of v(tand itat t = 0.5 seconds. Calculate the
phase angle, at t =0.5 seconds