# What is the effect of resonance?

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What is the effect of resonance?

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What is the effect of armature reaction? A) Demagnetization of the main field B) Demagnetization of the brushes C) Cross-magnetization of the brushes D) None of these

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explain skin effect in copper interconnects. what are the various ways of reducing this effect?

Which of the following statements is incorrect? A) During parallel resonance impedance at resonance is minimum B) During parallel resonance current is magnified C) During series resonance current at resonance is maximum D) During series as well as parallel resonance, the power factor is unity

Which of the following is true at resonance in LC circuits? A) The series impedance of the two elements is at a maximum and the parallel impedance is at minimum B) The series impedance of the two elements is at a maximum and the parallel impedance is also at maximum C) The series impedance of the two elements is at a minimum and the parallel impedance is also at minimum D) The series impedance of the two elements is at a minimum and the parallel impedance is at maximum

The purpose of a parallel circuit resonance is to magnify?

What is piezoelectric effect? Name two piezoelectric material.

What is meant by body effect in MOSFET?

what is skin effect?

what is Ferranti effect?

What causes the piezoelectric effect?  a) heat or dissimilar metals b) pressure on a crystal c) water running on iron d) a magnetic field

What are the main constructional differences between a MOSFET and a BJT? What effect do they have on the current conduction mechanism of a MOSFET?

The effect of negative feedback on distortion and bandwidth is A) Both distortion and bandwidth get decreased B) Both distortion and bandwidth get increased C) Distortion is reduced and bandwidth is increased D) Distortion is increased and bandwidth is decreased

The threshold effect in demodulators is a) The rapid fall of output SNR when the input SNR falls below a particular value b) Exhibited by all the demodulators when the input SNR is low c) Exhibited by all AM suppressed carrier coherent demodulators d) Exhibited by correlation receivers

The effect of corona is less by using (A) overhead lines of large conductor size (B) under ground cable of small conductor size (C) overhead lines having less spacing between conductors (D) overhead lines of higher voltages

The effect of increasing the length of air gap in an induction motor is to increase the (a) power factor (b) speed (c) magnetising current (d) air gap flux

The d.c. resistance of a conductor due to skin effect is (a) unchanged (b) decreased (c) increased (d) infinite

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are  A) Perpendicular B) Parallel C) Inclined at 60" D) Inclined at 30°

The flicker effect of fluorescent lamps is more pronounced at   (a) Lower frequencies (b) Higher frequencies (c) Lower voltage (d) Higher voltages

The skin effect in conductors is due to non uniform distribution of current in it and major portion of current is near the _______ of conductor.  (1) Surface (2) Center (3) Complete cross section area (4) Axis

Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

In pulse code modulation the effect of quantization is to (a) remove noise (b) introduce additional noise (c) limit noise in the channel (d) remove noise in the limiter

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