The lagging of flux density behind the applied magnetising force is known as flux. hysteresis. All of these permeance. TRUE ANSWER : ? YOUR ANSWER : ?
A negative point charge q = - 40 nC is moving with velocity of 6 × 106 m/s in a direction specited by unit vector uy + 0.6 uz. Find the magnitude of force vector on the moving particle by the field B = 2 ux + 3 uy + 5 uz mT and E = 2 ux - 3 uy + 5 uz KV/m 1144 μN. 144 μN. 1440 μN. 244 μN. TRUE ANSWER : ? YOUR ANSWER : ?
Which of following circuit element stores energy in electro-magnetic field? Variable Resistor. Capacitor. Condenser. Inductor. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following impedance inversion is obtained? Short-circuited stub A quarter wave line A half wave line Balun transformer TRUE ANSWER : ? YOUR ANSWER : ?
The wave in wave guide has Group velocity inversely proportional to wavelength Larger frequency than in the free space Diminishing wavelength than in the free space Larger wavelength than in the free space TRUE ANSWER : ? YOUR ANSWER : ?
An electric field of 1.92 × 103 N/C is maintained across two plates separated by 0.015 m. Potential difference across plates will be 1.4 V. 14.40 V. 28.8 V. 2.88 V. TRUE ANSWER : ? YOUR ANSWER : ?
A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur? At an angle of 45° to the axis of the magnetic field. At right angles to the axis of the magnetic field. Anywhere. Along the axis of the magnetic field. TRUE ANSWER : ? YOUR ANSWER : ?
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is 0.447. 0.01. 0.477. 0.577. TRUE ANSWER : ? YOUR ANSWER : ?
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing? 0 mH. 20 mH. 5 mH. 10 mH. TRUE ANSWER : ? YOUR ANSWER : ?
In order to minimize loss due to hysteresis the magnetic material should have large coercivity. high hysteresis coefficient. small B-H loop area. high resistivity. TRUE ANSWER : ? YOUR ANSWER : ?