Civil Service Aspirants Logo

You are browsing the best resource for TNPSC Group 1 Exam.

for the Aspirants who are preparing for Group 2,2A, Group 4,VAO kindly refer your Syllabus and Prepare with our site.
TUTORIALS LIBRARY
  Previous
Next  

Electronics and Communications

7. 

Electronic devices that convert D.C. power into A.C. power are called

A. Converters B. Transformer C. Inverters D. Rectifiers

Answer : C. Inverters

Justify your answer :  
Name:  
Email ID:  
 

8. 

Which of the following is an insulator?

A. Aluminium B. Copper C. Glass D. Silver

Answer : C. Glass

Justify your answer :  
Name:  
Email ID:  
 

9. 

A transformer

A. transforms energy B. transforms frequency C. transform voltage D. generates induced e.m.f.

Answer : D. generates induced e.m.f.

Justify your answer :  
Name:  
Email ID:  
 

10. 

Can D.C. voltage be used in a transformer

A. yes B. no C. some times D. None of these

Answer : B. no

Justify your answer :  
Name:  
Email ID:  
 

11. 

In a step-up transformer, the number of turns

A. in the primary is more than the secondary B. in the secondary is more than in the primary C. is same both in the primary and the secondary D. None of these

Answer : B. in the secondary is more than in the primary

Justify your answer :  
Name:  
Email ID:  
 

12. 

Two wires have their lengths,diameters and resistivities, all in the ratio of 1:2. If the resistance of the thinner wire is 10ohms,the resistance of the thicker wire shall be

A. 5 ohms B. 10 ohms C. 20 ohms D. 40 ohms

Answer : B. 10 ohms

Justify your answer :  
Name:  
Email ID:  
 
  Previous
Next  
TOP