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1. What is meant by the statement that a synchronous machine is ‘floating' on the busbars?
2. Elaborate the statement that an unloaded synchronous motor can be made to act as a capacitor or as an inductor.
3. Explain what is modified air-gap line withreference to OCC.
4. Explain what is modified air-gap line with reference to OCC.
A full-wave bridge rectifier circuit with a 1-kohms load operates from a 120-V (rms) 60-Hz household supply through a 10-to-1 step-down transformer having a single secondary winding
An inventor claims to have perfected an engine that wil produce power from energy transferred as heat from a 1000K flame. Energy wil be rejected as heat to the ground at 290 K. A 75 percent energy conversion efficiency is claimed.
A Si sample is doped with 106cm-3 boron atomsand a certain number of shallow donors. The Fermi level is.36eV above Ei at 300K. What is the donor concentration Nd
A DC electric motor draws a current of 8 amps, at a voltage of 50V. The efficiency of the motor is given as 60% at a a spindle speed of 400 rpm. Calculate the torque produced by the motor.
consider a fax/xerox outlet, processin files of various size. the size (in number of pages) of the files to be faxed or xeroxed has a geometric (p) and poisson (a) PMFs respectively. An arbitrary file arriving at the outlet is a fax file with prob..
Provide an ideal mixing operation with a 10-kHz local oscillator having an amplitude of 2, and eliminate the undesired component by using a band-pass filter centered at 20kHz. The bandwidth should be sufficient to pass the shifted AM signal.
For an ideal Zener, is the Zener voltage is 15v and the power rating is 750mW, what is the maximum zener current allowed What is the relationship between base current and collector current called
A point charge of 500π [nC] is located at the origin, an infinite uniform line charge with density of 18π[nC/m] lies along the z axis, and a uniform surface charge density of 2 [nC/m2] lies on all the z = 0 plane.
Consider the half wave rectifier with a 100Ω load and a peak voltage of 3.5 V. For a 1000μF capacitor, calculate the ripple amplitude if the frequency is 60 Hz.
What is the smallest integer number of time constants required for an exponential to decay to less than 10 percent of its initial value what percentage of its initial value is it at this time
Compute the minimum required op amp gain.
A 100-hp 440-V 0.8-PF-leading Δ-connected synchronous motor has an armature resistance of 0.22Ω and a synchronous reactance of 3.0Ω. Its efficiency at full load is 89 percent. What is the input power to the motor at rated conditions?
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