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A three-phase motor is used to drive a pump. It is observed (by the use of a stroboscope) that the motor speed decreases from 898r/min when the pump is unloaded to 830 r/min as the pump is loaded.
a. Is this a synchronous or an induction motor?
b. Estimate the frequency of the applied armature voltage in hertz.
c. How many poles does this motor have?
An 8 pole, three phase 50kVA, 220V, Y connected synchronousgenerator has a synchronous reactance of 4.8ohms per phase andoperates in stand-alone. Neglect all loses. The field voltage isadjusted to give rated voltage across the output terminal at n..
If the application program creates a message of 150 bytes and each layer (including the fifth and the first) adds a header of 20 bytes to the data unit, what is the efficiency (the ratio of application layer bytes to the number of bytes transmitte..
what role does imit enablement play in the following areas of kl enterprise corporate activities? by that i mean how
A 100μF capacitance is initially charged to 1000 V. At t1=0, it is connected to a 1kΩ resistance. At what time t2 has 50 percent of the initial energy stored in the capacitance been dissipated in the resistance
Suppose a random process is X(t) = A[cos(2fot + T)] where A and Fo are constants and T is a random variable that is uniformly distributed over [0, 2p]. 1. Is X(t) wide-sense stationary 2. Find power spectral density of x(t).
Design a buck converter that has an output of 12 V from an input of 18 V. The output power is 10 W. The output voltage ripple must be no more than 100 mV p-p. Specify the duty ratio, switching frequency, and inductor and capacitor values.
Consider a circuit consisting of a sinusoidal source vs(t) = cos(t)u(t) volts connected in series to a resistor R and an inductor L and assume that they have been connected for a very long time. (a) Let R=0 and L=1 H. Compute the instantaneous and ..
A coil has an inductance of 400 mH and aresistance, RL, of 10 Ω. The coil is connected in series with a 100 Ω resistor Racross a 240V - 50Hz supply voltage V. Sketch the circuit diagram and phasor diagram; take V as the reference phasor.
For most low reluctance materials currently available and used in practical magnetic devices such as transformers, the slope of the BH curve may be always be considered constant over the possible range of operation of the device.
Show that H(s) is invertible with an LTI inverse that is causal and stable (meaning, we can implement the inverse system) if and only if all poles and zeros of H(s) are strictly in the left half plane. We call such an H(s) minimum phase.
The voltage and current for a circuit element are v(t) = 10 + 6 cos(377t + -60) - 7 cos(754t + 10) V & i(t) = 7 + 4 cos(377t + -20) + 5 cos(754t + 10), with the phase angles given in degrees.
A message signal, x(t) has a bandwidth of 15 kHz and an average power of 0.5 W. This signal is to be uniformly quantized with an input range of range of +-5 V. What is the bit rate of the corresponding PCM signal if the SQNR is to be greater than ..
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