Basic Electrical Engineering MCQ_51_1 (Electromagnetism)

 

 
Q.1 The flux which is available at the air gap and can be utilized for some useful purpose is known as____.
    A. Leakage flux
    B. Useful flux
    C. Both A and B
    D. none of the above
Ans.: B
 
Q.2 The flux which completes its path through air or the medium surrounding the magnetic circuit instead of completing it through the core and air gap, this is known as__.
    A. Useful flux
    B. Fringing effect
    C. Leakage flux
    D. any of the above
Ans.: C
 
Q. 3 Leakage factor is the ratio of ____.
    A. Leakage flux to useful flux
    B. Total flux to useful flux
    C. useful flux to air gap flux
    D. air gap flux to leakage flux
Ans.: B
 
Q. 4 The tendency of the magnetic flux to spread out at the edges of the air gap is called as ___.
    A. Magnetic fringing
    B. leakage flux
    C. Hysteresis
    D. eddy current
Ans.: A
 
Q. 5 what is the effect of fringing?
    A. the effective cross sectional area of the air gap increased
    B. the flux density in the air gap is reduced
    C. Both A and B
    D. none of the above
Ans.: C
 
Q. 6 How to reduced leakage flux and magnetic fringing?
    A. by selecting high quality magnetic material
    B. making air gap as narrow as possible
    C. Both A and B
    D. any of the above
Ans.: C
 
Q. 7 The value of leakage factor is ideally____.
    A. 1 or 100%
    B. less than 1
    C. Greater than 1
    D. equal to zero
Ans.: A
 
Q. 8 Practically the value of leakage factor is ____.
    A. always less than 1
    B. always greater than 1
    C. always unity
    D. any of the above
Ans.: B
 
Q. 9 The leakage factor is also called as
    A. Hopkinson’s coefficient
    B. Maxwell constant
    C. constant of materials
    D. All of the above
Ans.: A
 
Q.10 Magnetization curve is the graphical relationship between ____ and ____, with H plotted on the X-axis and B on the Y-axis.
    A. magnetic flux density, magnetic field intensity
    B. magnetic flux, magnetic field
    C. Magnetic lines of force, magnetic field intensity
    D. any of the above
Ans.: A
 
Q. 11 The value of magnetic field strength required to wipe out the residual flux density is called as the____.
    A. Hysteresis loss
    B. Coercive force
    C. magneto motive force
    D. retentively
Ans.: B
 
Q. 12 The process of reducing the magnetic flux density to zero is called as ___.
    A. Magnetization
    B. residual magnetism
    C. demagnetization
    D. Both A and C
Ans.: C
 
Q. 13 The non zero value of B, when current I is = 0 is called as___.
    A. magnetization
    B. residual magnetism
    C. Coercive force
    D. none of the above
Ans.: B
 
Q. 14 The residual flux density is also called as__.
    A. residual magnetism
    B. magnetic flux density
    C. Remanent flux density
    D. Stored energy
Ans.: C
 
Q. 15 The ability of a substance to retain or resist magnetization is called as___.
    A. Coercivity
    B. Resistivity
    C. Retentivity
    D. none of the above
Ans.: C

 

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