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Q. Explain Commutator Action in dc machine?
As a consequence of the arrangement of the commutator and brushes, the currents in all conductors under the north pole are in one direction and the currents in all conductors under the south pole are in the opposite direction. Thus, the magnetic field of the armature currents is stationary in space in spite of the rotation of the armature.
The process of reversal of currents in the coil is known as commutation. The current changes from +I to -I in time Δ t . Ideally, the current in the coils being commutated should reverse linearly with time, as shown in Figure. Serious departure from linear commutation results in sparking at the brushes. Means for achieving sparkless commutation are touched upon later. As shown in Figure, with linear commutation, the waveform of the current in any coil as a function of time is trapezoidal.
Q. Explain the theory of thermal runaway? The maximum average power Pdmax which a transistor can dissipate depends upon the transistor construction and may lie in the
Q. The unit impulse response h(t) of a linear system is h(t) = 5e -t cos(2t - 30°). Determine H(s).
where is a zener diode used in a car
i want help in builiding a simulator of cellular systems under different frequency reuse scenarios?
The winding of an electromagnet has an inductance of 3H and a resistance of 15?. When it is connected to a 120 V d.c. supply, Determine: (a) the steady state value of current f
Q. Consider the magnetic circuit shown in Figure. Assume the relative permeability of the magnetic material to be 1000 and the cross-sectional area to be the same throughout. Deter
1. Given S(D1) = !Q1 X + !Q1 Q0 + Q1 !Q0 !X and S(D0) = !Q1 !Q0 !X + Q0 X + Q1 !Q0 !X A. DRAW A MINIMI
Q. List and explain the factors involved in the voltage build up of shunt generator. Ans. following factors are involved in voltage build up of shunt generation
Why do we use XRA A instruction The XRA A instruction is used to clear the contents of the Accumulator and keep the value 00H.
Why are some flashlights brighter than others? Why is it important that all of the batteries point in the same direction? What is the difference between old batteries and new? What
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