Main causes of noisy solenoid are______________?

Related Mcqs:

1. The main constituent of permalloy is_____________?

   A. cobalt
   B. chromium
   C. nickel
   D. tungsten

2. How does the magnetic compass needle behave in a magnetic field ?

   A. It assures a position right angle to magnetic field
   B. It starts rotating
   C. It assures a position which follows a line of magnetic flux
   D. None of the above

3. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

   A. 2 AT
   B. 4 AT
   C. 6 AT
   D. 10 AT

4. The change of cross-sectional area of conductor in magnetic field will affect______________?

   A. reluctance of conductor
   B. resistance of conductor
   C. A. and B. both in the same way
   D. none of the above

5. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?

   A. M
   B. M/2
   C. 2 M
   D. M/4

6. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

   A. 63.38 N/Wb
   B. 633.8 N/Wb
   C. 6338 N/Wb
   D. 63380 N/Wb

7. Out of the following statements, concerning an electric field, which statement is not true ?

   A. The electric intensity is a vector quantity
   B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
   C. An electric field is defined as a point in space at which an electric charge would experience a force
   D. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

8. One telsa is equal to___________?

   A. 1 Wb/mm2
   B. 1 Wb/m
   C. 1 Wb/m2
   D. 1 mWb/m2

9. Materials subjected to rapid reversal of magnetism should have______________?

   A. large area oiB-H loop
   B. high permeability and low hysteresis loss
   C. high co-ercivity and high retentivity
   D. high co-ercivity and low density

10. Which of the following is a vector quantity ?

    A. Relative permeability
    B. Magnetic field intensity
    C. Flux density
    D. Magnetic potential