Copy and Edit

MAGNETISM AND ELECTROMAGNETISM

Description

Engineering Quiz on MAGNETISM AND ELECTROMAGNETISM, created by Owen Ryan Ang on 24/01/2020.
Owen Ryan Ang
Quiz by Owen Ryan Ang, updated more than 1 year ago
Owen Ryan Ang
Created by Owen Ryan Ang over 4 years ago
12
0
0

Resource summary

Question 1

Question
A natural magnet is called
Answer
  • steel
  • lodestone
  • magnetism
  • soft iron

Question 2

Question
A magnet is able to attract
Answer
  • iron, aluminum and brass
  • iron, cobalt and zinc
  • iron, copper and nickel
  • nickel, cobalt and steel

Question 3

Question
Externally, magnetic line of force travels
Answer
  • south to north
  • north to south
  • negative to positive
  • in both directions

Question 4

Question
A material commonly used for shielding or screening magnetism is
Answer
  • brass
  • aluminum
  • copper
  • soft iron

Question 5

Question
The magnetism that remains in a magnet after the magnetizing force has been removed is called
Answer
  • permeability
  • induction
  • residual
  • saturation

Question 6

Question
Iron becomes magnetized by induction when it is
Answer
  • heated
  • suspended east and west
  • near to one end of a magnet
  • treated with some chemicals

Question 7

Question
Magnetic lines of force are called
Answer
  • hysteresis
  • current
  • flux
  • magnetomotive force

Question 8

Question
The force between two magnetic poles varies with distance between them. The variation is
Answer
  • in direct proportion to the distance
  • in inverse proportion to the distance
  • in direct proportion to the square of the distance
  • in inverse proportion to the square of the distance

Question 9

Question
The magnetic potential in a magnetic circuit can be measured in terms of
Answer
  • farads
  • M.M.F.
  • coulombs
  • none of these

Question 10

Question
Permeance is analogous to
Answer
  • conductance
  • resistance
  • reluctance
  • none of these

Question 11

Question
The permeability of a material means
Answer
  • strength of permanent magnet
  • strength of an electromagnet
  • the magnetization left in the iron after exciting field has been removed
  • the conductivity of a material for magnetic lines of force

Question 12

Question
When magnetic flux (Φ) and the area (A) under its influence are known, the magnetic flux density (B) can be given as
Answer
  • B = ΦA
  • B = Φ/A
  • B = A/Φ
  • B = ΦA2

Question 13

Question
The relative permeability μr is given by
Answer
  • B/μr0H
  • B/H
  • μ0/μ
  • μ0/H

Question 14

Question
Relative permeability of a material is given by (K is susceptibility of the material)
Answer
  • 1 + μ0K
  • 1 + K/μ0
  • 1 + μ0/K
  • μ0H

Question 15

Question
The relative permeability of paramagnetic substance is
Answer
  • slightly less than 1
  • equal to 1
  • slightly greater than 1
  • very much greater than 1

Question 16

Question
The value of permeability for the free space is
Answer
  • 4 x 10^-7 Hm-1
  • 4π x 10^-7 Hm-1
  • 4π x 10^7 Hm-1
  • 1/4π x 10^-7 Hm-1

Question 17

Question
The magnetization in any magnetic material appears as a result of
Answer
  • electrons orbital motion
  • electron spin
  • spin of the nucleus about its axis
  • all of these

Question 18

Question
The sum of the magnetic moments in unit volume of the solid is called
Answer
  • field strength
  • magnetism
  • permeability
  • susceptibility

Question 19

Question
Which of the following materials does not have permanent magnetic dipole
Answer
  • paramagnetic
  • antiferromagnetic
  • diamagnetic
  • ferrimagnetic

Question 20

Question
Interaction between the neighboring dipoles is negligible in case of a
Answer
  • paramagnetic material
  • diamagnetic material
  • antiferromagnetic material
  • ferrimagnetic material

Question 21

Question
Each ferromagnetic material has characteristic temperature above which its properties are quite different from those below that temperature. That temperature is called
Answer
  • transition temperature
  • Faraday's temperature
  • demagnetization temperature
  • Curie' temperature

Question 22

Question
The relative permability μ for iron is
Answer
  • 5000
  • 7000
  • 3000
  • 1000

Question 23

Question
Which of the following material is used for making permanent magnets
Answer
  • carbon steel
  • platinum cobalt
  • Alnico V
  • All of these

Question 24

Question
Which of the following has the highest value of relative permeability
Answer
  • iron
  • supermalloy
  • Mu-metal
  • 4% Si - Fe

Question 25

Question
Ferrimagnetic materials generally behave as a
Answer
  • semiconductor
  • conductor
  • insulator
  • any of A, B, or C

Question 26

Question
Transformer cores operating at microwave frequency ranges are generally made up of
Answer
  • ferrites
  • silicon steel
  • supermalloy
  • alnico V

Question 27

Question
The magnetic materials which can be easily magnetized in both directions are known as
Answer
  • soft magnetic materials
  • hard magnetic materials
  • low hysteresis loss materials
  • high hysteresis loss materials

Question 28

Question
Eddy current loss can be minimized by
Answer
  • decreasing the resistance of magnetic medium
  • increasing the resistance of magnetic medium
  • decreasing the permeability of magnetic medium
  • none of these
Show full summary Hide full summary

Want to create your own Quizzes for free with GoConqr? Learn more.

Similar

Orbital Mechanics
Luke Hansford
Software Processes
Nurul Aiman Abdu
Module 1: Introduction to Engineering Materials
Kyan Clay
Mathematics
rhiannonsian
Power
Luke Hansford
AOCS - Attitude and orbit control systems
Luke Hansford
Ordinary Differential Equations
rhiannonsian
audio electronics
Lillian Mehler
Building Structures
Niat Habtemariam
communication system
Lillian Mehler
Physical Science 2nd Quarter Assessment
Selam H
Browse Library