Electrical Engineering Materials MCQ PDF Download

101. The hysteresis loop for the material of the core of a transformer should be

(a) short and narrow.
(b) tall and narrow.
(c) short and wide.
(d) tall and wide.

102. The change in dimensions during the process of magnetization is termed as

(a) skin effect.
(b) magnetostriction.
(c) Hall’s effect.
(d) Peltier effect.

103. When a ferromagnetic substance is magnetized, there are small changes in dimensions. The phenomenon is called

(a) hysteresis.
(b) magnetostriction.
(c) diamagnetism.
(d) dipolar relaxation.

104. The converse of magnetostriction effect is

(a) Villari effect.
(b) Curie effect.
(c) Skin effect.
(d) Seebeck effect.

105. Which one of the following have the maximum permeability ?

(a) Grain oriented silicon steel.
(b) 4% silicon steel.
(c) Pure iron.

106. Area of hysteresis loop represents

(a) copper loss.
(b) eddy current loss.
(c) hysteresis loss.

107. Silicon content in steel reduces

(a) hysteresis loss.
(b) eddy current loss.
(c) copper loss.

108. Maximum flux density in cold rolled grain oriented steel is

(a) 0.5
(b) 1.1
(c) 1.5
(d) 2.1

109. Hysteresis loss is proportional to

(a) f
(b) f^1.5
(c) f²
(d) f³

110. On which of the following factors does hysteresis loss not depend?

(a) Magnetic field intensity.
(b) Frequency of the field.
(c) Volume of the material.
(d) Neel temperature.

 

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