Synchronous motors

the supply voltage and the back e.m.f.

magnetising current and back e.m.f.

the rotating stator flux and rotor poles

none of the above

field current and armature current

terminal voltage and load factor

power factor and field current

armature current and power factor

direcly proportional to the synchronous reactance

inversely proportional to the synchronous reactance

equal to the synchronous reactance

none of the above

has large values for low excitation i niy

has large values for high excitation only

has large values for low and high excitation

any of the above

speed

load

load angle

all of the above

zero or 0.8 leading

unity or 0.8 lagging

unity or 0.8 leading

unity or zero

alternator type machines

induction type machines

salient pole type machines

smooth cylindrical type machines

static condenser

condenser

synchronous condenser

none of the above

Of reducing number of slip rings on the rotor

Armature is associated with large power as compared to the field circuits

Of difficulty of providing high voltage insulation on rotor

All of the above reasons

Windage loss

Copper losses

Any of the above

None of the above