Q.1
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
Q.2
The unit of flux is the same as that of
Q.3
A keeper is used to
Q.4
Which of the following is not a unit of flux?
Q.5
When an iron piece is placed in a magnetic field
Q.6
Temporary magnets are used in
Q.7
Paramagnetic materials have relative permeability
Q.8
In a simple magnetic field the strength of magnet flux
Q.9
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
Q.10
Which of the following type of materials are not very important for engineering applications?
Q.11
The relative permeability of materials is not constant.
Q.12
A permeable substance is one
Q.13
The stray line of magnetic flux is defined as
Q.14
A permanent magnet
Q.15
Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of
Q.16
The magnetism left in the iron after exciting field has been removed is known as
Q.17
The materials having low retentivity are suitable for making
Q.18
One maxwell is equal to
Q.19
For which of the following materials the net magnetic moment should be zero?
Q.20
Which of the following is a vector quantity?
Q.21
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
Q.22
The retentivity (a property) of material is useful for the construction of
Q.23
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
Q.24
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?
Q.25
Magnetism of a magnet can be destroyed by
Q.26
Strength of an electromagnet can be increased by
Q.27
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
Q.28
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be
Q.29
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?
Q.30
The magnetic reluctance of a material
0 h : 0 m : 1 s