EE MCQ

SSC JE Electrical 2019 with solution SET-1
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The direction of the arrow represents the direction of when the diode is forward biased

The direction of the arrow represents the direction of the conventional current flow when the diode is forward biased.

Related Question

SSC JE Electrical 2019 with solution SET-1
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Reflected Light/Incident Light =

The ratio of luminous flux leaving the surface (Reflected Light) to the luminous flux incident on it (Incident Light) is known as the reflection factor.

Reflection Factor = Reflected light/Incident light

The value of the Reflection factor is always less than 1.

SSC JE Electrical 2019 with solution SET-1
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Two coupled coils with L1 = L2 = 0.5H have a coupling coefficient of K = 0.75. The turn ratio N1 ⁄ N2 = ?

The self-inductance is given as

L = μN2A/I

L ∝ N2

where

N is the number of turns of the solenoid

A is the area of each turn of the coil

l is the length of the solenoid

and μ is the permeability constant

L1/L2 = N21/N22

0.5/0.5 = N21/N22

N1/N2 = 1

SSC JE Electrical 2019 with solution SET-1
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Hunting occurs in a/an motor

Sudden changes of load on synchronous motors may sometimes set up oscillations that are superimposed upon the normal rotation, resulting in periodic variations of a very low frequency in speed. This effect is known as hunting or phase-swinging.

SSC JE Electrical 2019 with solution SET-1
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A shaded pole motor is basically a motor

The shaded-pole motor is the original type of AC single-phase induction motor. Shaded pole-type single-phase induction motors are provided with shading rings on their poles which are the projected type of poles. The stator of such motors has projected poles like DC machines as shown in Fig. 5.7. The rotor is a squirrel cage type similar to that of split-phase-type motors. The poles are excited by giving a single-phase AC supply. A single-turn thick coil in the form of a ring called the shading ring is fitted on each side of every pole as shown. The portion of the poles where the shading ring is fitted is called the shaded portion, while the other portion is called the unshaded portion.

The shaded pole motor has the lowest starting torque as compared to the all single-phase induction motors.

SSC JE Electrical 2019 with solution SET-1
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If admittance Y= a + jb, then a =?

Admittance (Y) is the reciprocal of the impedance of a circuit. Admittance of an AC circuit is analogous to the conductance of a DC circuit. The unit of Admittance is Simen or MHO

Admittance = 1/Z simen

Y = Conductance ± J Susceptance

Or the Admittance can be written as

Y = (G ± J B) Simen

Now comparing the above equation by the given equation in the question i.e Y= a + jb

∴ a = G = Conductance