A. Metal/alloy
B. Semi-conductor
C. Dielectric
D. None of these
Related Mcqs:
- Presence of even very minute amount (say 0.1%) of ______________ in copper, reduces its electrical conductivity very seriously?
A. Bismuth
B. Arsenic
C. Antimony
D. Both B. and C. - Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%) ?
A. Armature of small motors/generators
B. Generators and small motors
C. Induction motors
D. High frequency transformers - When the steel is subjected to normalising, its ______________ decreases?
A. Yield point
B. Ductility
C. Ultimate tensile strength (UTS)
D. None of these - The temperature at which new grains are formed in the metal is called the ______________ temperature?
A. Eutectic
B. Recrystallisation
C. Upper critical
D. Lower critical - Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?
A. Silicon steel
B. Chromium steel
C. Molybdenum steel
D. None of these - Purity of electrical grade aluminium should be ≥ _____________ percent?
A. 95
B. 99.5
C. 85
D. 90 - Zinc is highly ______________ at room temperature?
A. Ductile
B. Resistant to atmospheric corrosion
C. Malleable
D. Brittle - The high expansion metal normally used in the bimetallic thermometer is _______________ temperature measurement?
A. Brass for low
B. Nickel alloys for high
C. Both A. & B.
D. Aluminium for all - High speed steel tools retain their hardness upto a temperature of _____________ °C?
A. 500
B. 750
C. 900
D. 1100 - A magnetic material becomes ____________ above the Curie temperature?
A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. None of these
