Important Paper Electrical Engineering
1. With the increases in the cross sectional area of the conductor, the value of resistane :
(1) Increase
(2)Remain same
(3) Decrease
(4) None of these
Ans (3)
2. Which of the following industries will consume maximum power per tonne of product ?
(1) Zinc
2) Aluminium
(3) Alloy steel
(4) Cement
Ans (2)
3. The unit of volume resistivity is
(1) Ohm - m3/ m2
(2) ohm-m2 / m
(3) ohm - gram-m / gram
(4) ohm-m4 / m3.
Ans (1)
4. The SI unit of conductivity is
(1) ohm - m
(2) ohm / m
(3) mho - m
(4) mho / m.
Ans (4)
5. Resistance temperature coefficient of copper at 20° C is
(1) 0.0045/°C
(2) 0.0017/°C
(3) 0.00493/°C .
(4) 0.0038/°C.
Ans (3)
6. Which of the following materials possesses the least resistivity ?
(1) Iron
(2) Manganin
(3)Aluminium
(4) Copper
Ans (4)
7. Which of the following materials is a semiconductor ?
(1) Chromium
(2) Selenium
(3) Bismuth
(4) Silica
Ans (2)
8. Maximum temperature limit for class F insulation is
(1) 130 °C
(2) 120 °C
(3) 105 °C
(4) 155 ° C.
Ans (4)
9. The relative permeability of the super conductor materials is :
(1) Zero
(2) +1
(3) -1
(4) Infinity
Ans (1)
10. Gold, Silver and Copper are good conductors because their outer orbits contains :
(1)One electron
(2)Pair of electrons
(3) More than two electrons
(4)None of the above
Ans (1)
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