The design of electromagnets is based upon which of the following fundamental equations ?

Related Mcqs:

1. Which of the following is the commonly used type of electromagnets ?

   A. Flat-faced armature type
   B. Horse shoe type
   C. Flat-faced plunger type
   D. All of the above

2. electromagnets generally function as holding magnets ?

   A. Tractive
   B. Portative
   C. Either of the above
   D. None of the above

3. ____________are used for construction of core of electromagnets?

   A. Soft magnetic materials
   B. Hard magnetic materials
   C. Either A. or B.
   D. None of the above

4. Which of the following is the major consideration to evolve a good design ?

   A. Cost
   B. Durability
   C. Compliance with performance criteria as laid down in specifications
   D. All of the above

5. Which of the following is the basic consideration in the design of insulation ?

   A. Electrical considerations
   B. Mechanical considerations
   C. Thermal considerations
   D. All of the above

6. Which of the following is the major consideration to evolve a good design?

   A. Cost
   B. Durability
   C. Compliance with performance criteria as laid down in specifications
   D. All of the above

   Submitted by: Abid

7. The value of exciting or magnetizing current depends upon which of the following factors ?

   A. Total m.m.f. required
   B. The number of turns in the exciting winding
   C. The way in which the winding is distributed
   D. All of the above

8. The design of mechanical parts is particularly important in case of __________ speed machines?

   A. low
   B. medium
   C. high
   D. any of the above

9. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?

   A. conduction
   B. convection
   C. radiation
   D. any of the above

10. Which of the following methods is used for air cooling of turbo-alternators ?

    A. One sided axial ventilation
    B. Two sided axial ventilation
    C. Multiple inlet system
    D. All of the above