Magnetism and Electromagnetism - General Questions Online Exam Quiz
Magnetism and Electromagnetism - General Questions GK Quiz. Question and Answers related to Magnetism and Electromagnetism - General Questions. MCQ (Multiple Choice Questions with answers about Magnetism and Electromagnetism - General Questions
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
Options
A : increases
B : decreases
C : remains constant
D : reaches zero
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
Options
A : 1,000 V
B : 2,000 V
C : 31.25 V
D : 3,125 V
For a given wirewound core, an increase in current through the coil
Options
A : reverses the flux lines
B : decreases the flux density
C : increases the flux density
D : causes no change in flux density
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
Options
A : increases
B : decreases
C : remains the same
D : doubles
When the current through the coil of an electromagnet reverses, the
Options
A : direction of the magnetic field reverses
B : direction of the magnetic field remains unchanged
C : magnetic field expands
D : magnetic field collapses
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m 2 , and a permeability of 4,500 Wb/At × m?
Options
A : 1111 At/Wb
B : 111 At/Wb
C : 11 At/Wb
D : 1 At/Wb
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
Options
A : increase
B : decrease
C : remain constant
D : be excessive
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10 –3 m 2 ?
Options
A : 91.7 T
B : 917 T
C : 91 T
D : 9.7 T
The unit for reluctance is
Options
A : tesla
B : At/Wb
C : At/m
D : Wb
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
Options
A : increases
B : decreases
C : is zero
D : will remain constant
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