A. Free electrons
B. Ions
C. Conduction electrons
D. Holes
Related Mcqs:
- ________________ property of steel increases by addition of large amount of silicon in it?
A. Mechanical
B. Machining
C. Magnetic
D. Refractory - Silicon in steel__________________?
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
D. All ‘A’, ‘B’ & ‘C’ - Silicon percentage in acid resistant cast iron is about ___________________?
A. 4
B. 8
C. 14
D. 20 - Which of the following is not a charge material for cupola ?
A. Limestone
B. Iron scrap
C. Iron ore
D. Pig iron - Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
A. Sinter
B. Coke
C. Iron ore
D. Limestone - The main charge in blast furnace is usually___________________?
A. Iron ore & coke
B. Iron ore, coke & air
C. Limestone, coke & iron ore
D. Limestone, sand & iron ore - Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________?
A. Conduction
B. Convection
C. Radiation
D. Both A. & B. - The following type of bonding is strongly directional in solids ?
A. Vander Waal’s
B. Ionic
C. Metallic
D. Covalent - The type of pump used for lifting large quantity of sewage is a _________________ pump ?
A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger - For dynamic strain measurement, the Wheatstone bridge used is of ______________ type ?
A. Voltage sensitive null
B. Voltage sensitive deflected
C. Current sensitive deflected
D. None of these
