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Q. A 10-hp, 230-V dc shunt motor takes a full- load line current of 40 A. The armature and field resistances are 0.25 and 230 , respectively. The total brush-contact drop is 2 V, and the core and rotational losses are 380 W. Assume that stray- load loss is 1%of output. Compute the efficiency of the motor.
List four sources of information which are essential to the designer of this electrical installation
Singles Phase Half wave Controlled Rectifier with RL Load When gate pulses are applied to the thyristor at output voltage v0 follows the input voltage v s ( = V m sin ) s
Q. Show Step-motor control system? Figure illustrates a system in which the prime mover used in the disk-drive system is a step motor driven by pulse commands. In response to e
Q. Show the Complement Representation? There are two types of complements for each number system. r's and (r-1)'s complement ex. decimal
a 49pf cap,a 50 uH inductor, and a 100 ohms resister are in parallel: what is the resonance freq? And what is the complex impedance vector at 100MHZ?
Let the message signal m(t) = α cos (2πf m t) be used to either frequency-modulate or phase- modulate the carrier Ac cos(2πf c t). Find the modulated signal in each case.
Q. An interesting application of the SRFF is as a buffer in overcoming contact bounce in mechanical switches. These switches, of the toggle type, may be used to change the logic st
a) Describe Schmitt trigger with the help of transfer characteristics. b) Also get the expression of hysteresis voltage VH and output waveform for sinusoidal input signal
how to measure
why is detecting the time of islanding relevant?
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