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DC Motor Starting
When voltage is applied to the armature of a dcmotorwith the rotor stationary, no emf is generated and the armature current is limited only by the internal armature resistance of the machine. So, to limit the starting current to the value that the motor can commutate successfully, all except very small dc motors are started with variable external resistance in series with their armatures. This starting resistance is cut out manually or automatically as the motor comes up to speed.
Q. Determine L and C of the band pass filter circuit of Figure to have a center frequency of 1 MHz and a bandwidth of 10 kHz. Also find the Q of the filter.
breifly explain dual trace cro
Phasor relation between different voltages and currents: In the capacitive circuit of Figure, find 1. Impedance, 2. Resultant current, 3. Power factor,
Write down basic postulates of sommerfield’s free electron gas model. Show that the number of energy states per unit energy is given by g(E) = 4Rv/h 3 (2m) 3/2 E 1/2 . What is
Suppose the ambiguity function of some waveform x ( t ) of duration ζ = 1 millisecond is given by (NOTE: this is not a possible AF because it is not time-limited to
Applications of holography 1. Holography is used in the non-destructive tests by interferometic methods. In this method called double exposure holographic interferometry,
which ckt. Or components using for irregular ac sine wave change into pure sine wave.......
If a current is passed through a coil, it creates a flux within the coil. Any attempt to change this flux will create a back emf that acts to oppose the change. Consider again
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Hexadecimal is of use in IT because (1) It is a compact system (e.g. only 3 digits represent the number 986) (2) As 16 are a power of 2 it turns out to be quite easy to conv
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