Transformers
tightness of clamping
gauge of laminations
size of laminations
all of the above
Answer is Wrong!
Answer is Right!
32. If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be
$$rac{{{{ ext{R}}_2}}}{{sqrt { ext{K}} }}$$
$$rac{{{{ ext{R}}_2}}}{{{{ ext{K}}^2}}}$$
$$rac{{{ ext{R}}_2^2}}{{{{ ext{K}}^2}}}$$
$$rac{{{ ext{R}}_2^2}}{{ ext{K}}}$$
Answer is Wrong!
Answer is Right!
33. In a transformer the tappings are generally provided on
primary side
secondary side
low voltage side
high voltage side
Answer is Wrong!
Answer is Right!
Detailed SolutionIn a transformer the tappings are generally provided on
34. The function of breather in a transformer is
to provide oxygen inside the tank
to cool the coils during reduced load
to cool the transformer oil
to arrest flow of moisture when outside air enters the transformer
Answer is Wrong!
Answer is Right!
Detailed SolutionThe function of breather in a transformer is
35. Distribution transformers are generally designed for maximum efficiency around
90% load
Zero load
25% load
50% load
Answer is Wrong!
Answer is Right!
Detailed SolutionDistribution transformers are generally designed for maximum efficiency around
36. The permissible flux density in case of cold rolled grain oriented steel is around
1.7 Wb/m2
2.7 Wb/m2
3.7 Wb/m2
4.7 Wb/m2
Answer is Wrong!
Answer is Right!
Detailed SolutionThe permissible flux density in case of cold rolled grain oriented steel is around
37. The main reason for generation of harmonics in a transformer could be
fluctuating load
poor insulation
mechanical vibrations
saturation of core
Answer is Wrong!
Answer is Right!
Detailed SolutionThe main reason for generation of harmonics in a transformer could be
38. Transformer breaths in when
load on it increases
load on it decreases
load remains constant
none of the above
Answer is Wrong!
Answer is Right!
39. The noise resulting from vibrations of laminations set by magnetic forces, is termed as
Magnetostriction
Boo
Hum
Zoom
Answer is Wrong!
Answer is Right!
40. Material used for construction of transformer core is usually
wood
copper
aluminium
silicon steel
Answer is Wrong!
Answer is Right!
Detailed SolutionMaterial used for construction of transformer core is usually