Electrical Engineering : Electrical Engineering Materials QUESTIONS AND ANSWERS :: part3 : 6 to 10
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.Due to which of the following reasons aluminium does not corrode in atmost phere ? |
| Aluminium is a noble metal |
| Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium |
| No reaction with oxygen occurs ft Any of the above |
| b |
7.Due to which of the following fact, in India, aluminium is replacing copper ? |
| Aluminium is more ductile and malleable than copper |
| Aluminium is available in plenty, cheaper and lighter than copper |
| Aluminium has lower resistivity than that of copper |
| Aluminium has less temperature co-efficient than copper |
8.Thermocouples are mainly used for the measurement of |
| temperature |
| resistance |
| eddy currents |
| coupling co-efficient |
9.Which of the following high resistance materials has the highest operating temperature ? |
| Kanthal |
| Manganin |
| Nichrome |
| Eureka |
10.The resistivity of a metal is a function of temperature because |
| the amplitude of vibration of the atoms varies with temperature |
| the electron density varies with temperature |
| the electron gas density varies with temperature |
| the amplitude of vibration of the atoms varies with temperature |
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