Related MCQ Question

• The unit of magnetic flux is
• Permanent magnets are normally made of 
• Energy stored by a coil is doubled when its current is increased by ……….percent.
• Those magnetic materials are best suited for making armature and transformer cores should have
• The rate of rise of current through an inductive coil is maximum
• When both the inductance and resistance of the coil are doubled the value of
• A material for good magnetic memory should have
• In a magnetic material hysteresis loss takes place primarily due to
• Those materials are well suited for making permanent magnets should have
• If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
• Hard steel is suitable for making permanent magnets because
• The property of a material which opposes the creation of magnetic flux in it is known as
• The unit of retentivity is
• The unit of reluctance is
• A ferrite core has less eddy current loss than an iron core because
• A ferromagnetic core subjected to cycles of magnetization will exhibit hysteresis when the cycle is
• In order to minimise loss due to hysteresis, the magnetic material should have
• Hysteresis loss least depends on
• In electrical machines, Laminated cores are used to reduce
• The area of hysteresis loss is a measure of
• The transformer cores operating at microwave frequency range, are usually made of