20EE262-BEEE Surprise Quiz - II

The direction of the magnetic field around a current-carrying conductor can be determined using ____.

• Right-hand thumb rule

• Fleming's left-hand rule

• Ohm's law

• Ampere's law

Magnetic flux density (B) is defined as ____.

• flux per unit resistance

• flux per unit area

• flux per unit length

• flux per unit current

Mutual inductance occurs when ____.

• magnetic flux is constant

• current flows in a single coil

• two inductors share a magnetic field

• two inductors are connected in series

The coefficient of coupling (k) for a perfect magnetically coupled coil is ____.

• 0

• 0.5

• Infinite

• 1

The energy stored in an inductor is given by ____.

• 12LI2

• LI

• 12CV2

• 12LI2R

The induced EMF in a coil is proportional to the _____.

• resistance of the coil

• magnetic flux linkage

• current in the coil

• rate of change of magnetic flux

In a step-up transformer, the number of turns in the secondary winding is ___.

• equal to the primary

• greater than the primary

• less than the primary

• connected electrically to the primary

In a transformer, eddy current losses can be reduced by ____.

• increasing the load current

• using a laminated core

• decreasing the load resistance

• increasing the primary turns

The purpose of oil in a transformer is to ____.

• provide insulation and cooling

• reduce eddy current losses

• lubricate the windings

• reduce noise

When the load on the secondary side of a transformer increases, then the _____.

• secondary flux decreases

• primary voltage increases

• primary current increases

• core losses decrease