MCQs

1. [2082] If [latex]\chi[/latex] is the magnetic susceptibility of a material then its relative permeability [latex](\mu_r)[/latex] is
   a. [latex]\chi + 1[/latex]                              
   b. [latex]\chi – 1[/latex]                       
   c. [latex]\frac{1}{\chi}[/latex]                              
   d. [latex]1 + \chi^2[/latex]
2. [2081 GIE ‘A’] The value of magnetizing field (H) when magnetic flux density (B) is equal to zero is called
   a. retentivity                                           
   b. curie temperature
   c. coercivity                                            
   d. susceptibility
3. [2081 GIE ‘B’] The value of magnetic susceptibility is negative for
   a. diamagnetic substance                         
   b. paramagnetic substance
   c. ferromagnetic substance                       
   d. ferrimagnetic substance
4. [2081 B/C] Which of the followings is the ferromagnetic material?
   a. Aluminium                 
   b. Gold                        
   c. Copper                    
   d. Cobalt
5. [2081 ‘D’] Which of the followings can be explained by the area of the hysteresis curve?
   a. retentivity                                           
   b. loss of energy per cycle
   c. coercivity                                            
   d. Curie’s temperature
6. [2080 GIE ‘A’] The value of magnetizing field (H) when magnetic flux density equals to zero (B = 0) is called
   a. Retentivity                                          
   b. Hysteresis               
   c. Coercivity                                           
   d. Curie’s temperature
7. [2080 GIE ‘B’] Laminated cores are placed in transformers to
   a. Reduce eddy current                            
   b. Reduce hysteresis loss
   c. Reduce magnetic effect                        
   d. Increase coercivity
8. [2080 ‘P’] What happens to the susceptibility of ferromagnetic substance if temperature is decreased?
   a. Increases                                             
   b. Decreases
   c. Remains same                                     
   d. May increase or decrease
9. [2079 GIE ‘A’] Area of hysteresis curve indicates
   a. Retentivity                                          
   b. Coercivity
   c. Loss of energy per cycle                      
   d. Gain of energy per cycle
10. [2079 GIE ‘B’] Which one is used in the core of a transformer?
    a. Soft iron                      
    b. steel                        
    c. Aluminium                          
    d. Zinc
11. [2079 ‘V’] Above curie temperature
    a. A ferromagnetic substance becomes paramagnetic
    b. A ferromagnetic substance becomes diamagnetic
    c. A paramagnetic substance becomes diamagnetic
    d. A paramagnetic substance becomes ferromagnetic

Answers:

1.a	2.c	3.a	4.d	5.b	6.c	7.a	8.a	9.c	10.a
11.a