20EE262-BEEE-SQ1

The relationship between magnetomotive force (MMF), magnetic flux (Φ), and reluctance (R) in a magnetic circuit is described by __________

• Ampere’s law

• Ohm’s law

• Faraday’s law

• Biot-Savart law

Magnetic field intensity is given by _____

• I/Nl

• N/Il

• l/NI

• NI/l

The reciprocal of reluctance is __________

• resistance

• conductance

• permeance

• inductance

The unit of magnetic flux density is ___________

• Weber

• Weber/m

• Ampere-turns

• Tesla

The copper loss of transformers depends on ________.

• current

• voltage

• power

• energy

The function of conservator in an electrical transformer is to __________

• supply cooling oil to transformer in time of need

• provide fresh air for cooling the transformer

• protect the transformer from damage when oil expends due to heating

• protect from dirt

The flux created by the current flowing through primary winding induces emf in _____

• primary winding only

• secondary winding only

• transformer core only

• both primary and secondary winding

A step-down transformer has 600 turns on the primary winding and 300 turns on the secondary winding. If the primary voltage is 240V, what is the secondary voltage?

• 120V

• 240V

• 480V

• 960V

The primary and secondary winding of a transformer are usually wound on the same core to ________

• reduce the size of the transformer

• increase the voltage of the primary winding

• decrease the voltage of the secondary winding

• ensures efficient energy transfer between the winding

The transformer ratings are expressed in terms of __________

• kW

• V

• kVAR

• kVA