The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?

Related Mcqs:

1. The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?

   A. tightness of clamping
   B. gauge of laminations
   C. size of laminations
   D. all of the above

2. The thickness of laminations used in a transformer is usually____________?

   A. 0.4 mm to 0.5 mm
   B. 4 mm to 5 mm
   C. 14 mm to 15 mm
   D. 25 mm to 40 mm

3. The noise produced by a transformer is termed as_______________________?

   A. zoom
   B. hum
   C. ringing
   D. buzz

4. Noise level test in a transformer is a______________?

   A. special test
   B. routine test
   C. type test
   D. none of the above

5. The path of a magnetic flux in a transformer should have______________?

   A. high resistance
   B. high reluctance
   C. low resistance
   D. low reluctance

6. The path of the magnetic flux in transformer should have____________?

   A. high reluctance
   B. low reactance
   C. high resistance
   D. low resistance

7. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?

   A. friction and windage losses
   B. copper losses
   C. hysteresis and eddy current losses
   D. none of the above

8. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?

   A. 50°C
   B. 80°C
   C. 100°C
   D. 150°C

9. Which of the following loss in a transformer is zero even at full load ____________?

   A. Core loss
   B. Friction loss
   C. Eddy current loss
   D. Hysteresis loss

10. Which of the following insulating materials can withstand the highest temperature safely ?

    A. Cellulose
    B. Asbestos
    C. Mica
    D. Glass fibre