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SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
 Find the mutual inductance between two ideally coupled coils of 2H and 8H

16 H
8 H
4 H
2 H

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Mutual inductance between the two coils is K = √L1.L2
K = √2 × 8
k = √16
k = 4 H
 

SSC JE Electrical 2019 with solution SET-1
 An alternator has 9 slots/pole. What is the value of the pitch factor if each coil spans 8 slot pitches

Cos 30°
Cos 60°
Cos 10°
Cos 45°

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Coil Span = 8
Pole Pitch = 9 slots/pole
Slot angle (α) = 180° / Pole Pitch = 180°/9 = 20°
Pitch Factor = cos(α/2) = cos (20/2)
Pitch Factor = cos 10°
 

SSC JE Electrical 2019 with solution SET-1
 In the below circuit, X = ?

B
A
A + B
A.B

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The circuit shown in the question is an AND GATE. In an AND gate has two or more inputs but it has only one output. An input signal applied to a gate has only two stable states, either 1 (HIGH) or 0 (LOW). In AND gate for any input A&B the output is A.B.
 


SSC JE Electrical 2019 with solution SET-1
 Which of the following lamps employs a bimetallic strip?

Incandescent lamp
Fluorescent lamp
Mercury vapor lamp
Sodium vapor lamp

ANSWER DOWNLOAD EXAMIANS APP

SSC JE Electrical 2019 with solution SET-1
 The power factor of an A.C. circuit is equal to

R/XC
R/XL
R/Z
Z/R

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit ” R/Z”.
 

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

DC shunt
DC series
Induction
Synchronous

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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.
 

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