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 10° Cos 60° Cos 30° Cos 45° Cos 10° Cos 60° Cos 30° Cos 45° ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Coil Span = 8Pole Pitch = 9 slots/poleSlot 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 An electric heater is connected across 230V and it draws a current of 2A. Then the resistance offered by the heater is? 115 ohm 290 ohm 11.5 ohm 29 ohm 115 ohm 290 ohm 11.5 ohm 29 ohm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP GivenVoltage V = 230 VCurrent I = 2 AResistance R = V/IR = 230/2 = 115 Ω
SSC JE Electrical 2019 with solution SET-1 If an alternator is operating at unity power factor, then its terminal voltage is Greater than the induced EMF, with negative voltage regulation Less than the induced EMF, with positive voltage regulation Less than the induced EMF, with negative regulation Equal to the induced EMF, with zero voltage regulation Greater than the induced EMF, with negative voltage regulation Less than the induced EMF, with positive voltage regulation Less than the induced EMF, with negative regulation Equal to the induced EMF, with zero voltage regulation ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 ______starting method CANNOT be used for starting a 3-phase squirrel cage induction motor Direct-on-line Rotor-resistance Auto-transformer Star-delta Direct-on-line Rotor-resistance Auto-transformer Star-delta ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 Hunting occurs in a/an motor DC shunt Induction Synchronous DC series DC shunt Induction Synchronous DC series 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 In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is 0° 30° 90° 60° 0° 30° 90° 60° ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In the given circuit if R = 0 then the circuit becomes purely inductive. So the phase angle between v(t) and i(t) is 90°.
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