OE-EMD-MOD 1

The property of the magnetic circuit which opposes the flux is known as ________

• resistance

• reluctance

• conductance

• permeance

The unit of magnetic flux density is ______

• AT/Wb

• Wb/AT

• Wb/m2

• AT/m

____________ is the force responsible for flow of flux in magnetic circuit

• EMF

• Voltage

• Current

• MMF

_______ is the one where the induced EMF is generated without any physical movement of the coil or conductor

• Dynamically induced EMF

• Self Induced EMF

• Statically induced EMF

• Mutually Induced EMF

The ______ loss is directly proportional to the square of frequency.

Input power = output power+ __________

The _______ and ________ are two important parts of machine.

• Stator and Rotor

• Field and Armature

• commutator and brushes

• both a and b

The armature of DC machine is made up of silicon steel in order to reduce _____

• copper loss

• variable loss

• hysteresis loss

• eddy current loss

Brushes of DC Machines are made up of _______

• Carbon

• iron

• Copper

• steel

The basic law behind working of any machine is ________

• Biot savart's law

• Lenz's law

• Faraday's law of electromagnetic induction

• Newton's law