An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the…

Non inductive resistances are used in decreasing______________? A. Mutual inductanceB. Self inductance C. Magnetic fields D. Heating effect

Which one of the following devices does not function like an electric motor ? A. Galvanometer B. Ammeter C. VoltmeterD. Transformer

For long distance transmission the transformer used is_____________? A. Step down B. Input voltage and output voltage remain sameC. Step up D. Amplifier is used

Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________? A. Retaintivity B. Permeability C. FluxD. Hysteresis

When the motor is at its maximum speed then back emf will be______________? A. Maximum B. Zero C. Intermediate values D. No back emf

Transformer works on the principle of________________? A. Lenzs law B. Faradays lawC. Mutual induction D. Law of conservation of power

An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________? A. Induced currentB. Eddy current…

The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________? A. 3-JanB. 3 C. 1 D. 6

Long distance transmission is easy for________________? A. D.C voltageB. A.C voltage C. Half A.C voltage D. Half D.C voltage