Page 98 - Basic Electrical Engineering
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d.
9. Which of the following expressions is incorrect?
a.
b.
c.
d. .
10. Inductance of an air-core coil will increase if the core is made of
a. copper
b. aluminium
c. iron
d. porcelain.
11. Which of the following statements is not true?
a. Inductance of a coil will increase by four times if the number of terms eq is doubled
b. inductance of a coil will increase if the area of cross section of the coil, i.e., the flux
path is increased
c. inductance of a coil will increased if the length of flux path is increased
d. inductance of a coil will increase if the core is made up of material having higher
permeability.
12. The direction of the induced EMF in the coil sides of a coil rotating in a magnetic field can be
determined by applying
a. Fleming’s left-hand rule
b. Right-hand-grip rule
c. Fleming’s-left-hand rule
d. Cork screw rule.
13. Which of the following is not the unit of energy?
a. kWh
b. Joules/second
