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SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
 When the only current source is active in the circuit, find the current through the 10Ω resistor

0 A
1.33 A
0.66 A
1.66 A

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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 45°
Cos 60°
Cos 30°
Cos 10°

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
Hunting occurs in a/an motor

Synchronous
DC series
Induction
DC shunt

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.
 

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

Nichrome
Galvanized steel
Cadmium copper
Hard drawn copper

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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.
 

SSC JE Electrical 2019 with solution SET-1
 Identify the important feature of a DC series motor

Zero starting torque
Medium starting torque
Low starting torque
High starting torque

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

In DC series motor Torque (Ta) increase as the Square of armature current (Ia) Ta ∝ Ia2. So DC motor provides high starting torque.

SSC JE Electrical 2019 with solution SET-1
 A synchronous motor runs at 600rpm, which of the following case is true?

P  = 12, f = 60 Hz
P= 12, f = 50 Hz
P = 10, f = 60 Hz
P = 8, f = 50 Hz

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Synchronous speed NS = 120f/P
When
P = 12 & F = 60 then Ns = ?
NS = 120f/P = (120 × 60)/12 = 600 RPM

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