$\backslash$#$1-$ Answer by true or false, and justify your answers:

a$-$ In power system the transformers used to decrease only the loss during transmission.

b$-$ The hysteresis losses resistive heating losses in the core of the transformers.

c$-$ In the transformer circuit the voltage regulation for leading power factor is positive.

d$-$ For $\backslash (\backslash$Delta$-\backslash$gamma $\backslash )$ connected transformers the turn ratio $\backslash ($ a$\_\{3\}\{\}^\{2\}=\backslash$sqrt$\{3\}$ a$\_\{1\}\backslash$Phi $\backslash ).$

e$-$ The frequency of the oncoming generator must be slightly greater than the frequency of the running system.

f$-$ In the synchronous motor circuit, an increase in field current decreases the magnitude of EA but increase the real power supplied to the motor.

g$-$ When the projection of the phasor $\backslash ($ E$\_\{$A$\}\backslash )$ onto $\backslash ($ V$\_\{\backslash$varphi$\}\backslash )$ is shorter than $\backslash ($ V$\_\{\backslash$varphi$\}\backslash )$ itself, a synchronous motor has a leading current and supplies reactive power.

h$-$ In dc machine circuit when the coil is located under the pole the brushes commutate the segments.

i$-$ Like a shunt DC motor the cumulatively compounded DC motor does not over speed at no load.

j$-$ The compensating winding in a dc motor cancel the armature reaction affect but decrease its reference speed.