A. 4
B. 8
C. 14
D. 20
Related Mcqs:
- 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 - White cast iron as compared to grey cast iron is ________________?
A. More durable
B. Very brittle
C. Very hard
D. All A., B. & C. - Containers made of high silicon cast iron (14% Si) are not suitable for the storage of ____________________?
A. Acetic acid
B. Benzoic & boric acids
C. Phosphoric acid (95%) & sulphuric acid (95%)
D. Hydrochloric acid (concentrated) - Silicon percentage in iron castings to have maximum hardness should be about__________________?
A. 0.3
B. 0.5
C. 0.8
D. 2.5 - Carbon percentage is the same in cast iron and_________________?
A. Wrought iron
B. Pig iron
C. Mild steel
D. High silicon (14%) iron - Presence of high amount of silicon in cast iron________________?
A. Suppresses the decomposition of Fe3C
B. Increases the formation of graphite
C. Increases the contraction of the metal
D. Reduces its fluidity - Maximum carbon content in cast iron is ______________ percent?
A. 3.8
B. 5.2
C. 4.8
D. 4.3 - Cast iron and steel pipes are produced by ____________ casting?
A. Die
B. Investment
C. Slush
D. True centrifugal - With increase in carbide/graphite ratio in cast iron, its__________________?
A. Hardness & brittleness increases
B. Ductility decreases
C. Both A. and B.
D. Neither A. nor B. - Presence of high phosphorous in cast iron increases its____________________?
A. Fluidity
B. Melting point
C. Shrinkage
D. Tensile strength
