A. tightness of clamping
B. gauge of laminations
C. size of laminations
D. all of the above
Related Mcqs:
- The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
A. magnetostrication
B. boo
C. hum
D. zoom - 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 - Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated - The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
A. Conservator
B. Breather
C. Bushings
D. Buchholz relay - In a transformer routine efficiency depends upon_____________?
A. supply frequency
B. load current
C. power factor of load
D. both B. and (c) - The leakage flux in a transformer depends upon______________?
A. load current
B. load current and voltage
C. load current, voltage and frequency
D. load current, voltage, frequency and power factor - The noise produced by a transformer is termed as_______________________?
A. zoom
B. hum
C. ringing
D. buzz - The core used in high frequency transformer is usually___________?
A. copper core
B. cost iron core
C. air core
D. mild steel core - When secondary of a current transformer is open-circuited its iron core will be__________?
A. hot because of heavy iron losses taking place in it due to high flux density
B. hot because primary will carry heavy current
C. cool as there is no secondary current
D. none of above will happen - The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the above
