Electrical Engineering : Electrical Engineering Materials QUESTIONS AND ANSWERS :: part2 : 11 to 15
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.Thermonic emission occurs in |
| vacuum tubes |
| copper conductors |
| ferrite cores |
| transistors |
12.A good electric contact material should have all of the following properties excePt |
| high resistivity |
| high resistance to corrosion |
| good thermal conductivity |
| high melting point |
13.Solder is an alloy of |
| copper and aluminium |
| tin and lead |
| nickel, copper and zinc |
| silver, copper and lead |
14.______ is an example of piezoelectric material. |
| Glass |
| Quartz |
| Corrundum |
| Neoprene |
15.The number of atoms per unit cell in B.C.C. structure is |
| 1 |
| 2 |
| 4 |
| 8 |
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