SSC JE Electrical Engineering 2013

$$ i = I_m \sin (\omega t + 5^\circ) amps $$

$$ i = I_m \sin (\omega t - 25^\circ) amps $$

$$ i = I_m \sin (\omega t + 25^\circ) amps $$

$$ i = I_m \sin (\omega t - 5^\circ) amps $$

$$ I_{av} = \frac{I_m}{2} $$

$$ I_{av} = \frac{\pi}{2} I_m $$

$$ I_{av} = \frac{2}{\pi} I_m $$

$$ I_{av} = \frac{I_m}{\sqrt2} $$

Hans christain Oersted

Andre-Marie Ampere

Mechale Faraday

Emil Lenz

12.75 henry

5.1 henry

0.425 henry

1.7 henry

$$0.0045/^\circ C $$

$$0.0017/^\circ C $$

$$0.00393/^\circ C $$

$$0.0038/^\circ C $$

the voltage drop in armature resistance

the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drop in armature resistance

the voltage drop to armature reaction and voltage drop in armature resistance

the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drops in armature and field resistance

$$ 2.6856 \times 10^7 $$ watt-seconds

$$ 4.476 \times 10^5 $$ watt-seconds

$$ 2.646 \times 10^7 $$ watt-seconds

$$ 6.3943 \times 10^6 $$ watt-seconds

50 Hz, 0.02 sec

40 Hz, 0.025 sec

300 Hz, 0.00333 sec

$$ 2400 Hz, \frac {1} {2400} sec $$

capacitor start single phase IM

resistance split single phase IM

capacitor start capacitor run single phase IM

permanent capacitor run single phase IM

remains unaffected

increases

decreases

changes by an amount depending on the controlling torque