EE MCQ

SSC JE Electrical 2019 with solution SET-1
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________ is used to manufacture stay wire, earth wire, and structural components

Galvanized steel conductors do not corrode, and possess high resistance. Hence such Wires are used in telecommunications circuits, earth wires, guard wire, stray wire, etc.

Related Question

SSC JE Electrical 2019 with solution SET-1
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Lamp efficiency is measured in

The luminous efficiency of an electric lamp is the ratio of the luminous flux (in lumen) emitted by the lamp to the electric power (watt) given to it i.e.

Luminous efficiency η = Luminous flux/Watt

Note:- Lumens is the unit of measurement for luminous flux, which is the total amount of visible light emitted by a source.

1

SSC JE Electrical 2019 with solution SET-1
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In an AC network, the load connected is (10 + j10). The phase relation between the voltage applied and the current through the load is:

L0ad impedance Z = R + jX

z = 10 + 10j

Phase angle θ= tan−1(IL/IR)

θ= tan−1(10/10)

tanθ = 1

tanθ =45°

SSC JE Electrical 2019 with solution SET-1
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Which of the following is the correct relation regarding coupled coils?

Mutual inductance between two coupled coils is given by the relation

M = K√L1L2

Where

L1L2 = Inductance of the coil

K = Coefficient of coupling

When K = 1 coils are said to be tightly coupled and if K is a fraction the coils are said to be loosely coupled.

Here

Kmax =1

Kmin =0

∴ m ≤ (L1 L2 )0.5