EE MCQ

SSC JE Electrical 2019 with solution SET-2
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If a zero-centered voltmeter has a scale from 5V to − 5V, then the span of it is

Voltage Scale Span of instrument = Vmax − Vmin

Given

Vmax = 5 V

Vmin = −5V

Span = 5 −(−5) = 10 V

Related Question

SSC JE Electrical 2019 with solution SET-2
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A long straight wire carries a current I = 10 A. At what distance is the magnetic field H = 1 A/m?

The strength of a magnetic field is specified by the magnetic induction B or by the magnetic field strength H. A current I through a long, straight wire produces a magnetic field with strength H = I/2πr at a distance r from the wire.

Given

H = 1 A/m

I = 10 A

H = I/2πr

1 = 10/2πr

r = 10/2π

SSC JE Electrical 2019 with solution SET-2
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In an alternator, if α = 60°, then find the pitch factor?

The factor by which, the induced E.M.F gets reduced due to short pitching is called pitch factor or coil span factor denoted by Kc. It is given as

Kc = cosα/2

given

α = 60°

Kc = cos60/2

Kc = cos30°

Kc = √3/2

SSC JE Electrical 2019 with solution SET-2
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If two impedances are given as Z1 = 20∠60° and Z2 = 5∠30°, then Z1/Z2 = ?

please check below image for solution.