THE DESIGN OF ALTERNATING 
GENERATORS AND SYNCHRONOUS 
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MOTORS. 
What is a synchronous motor? 
Name the principal characteristic properties of a synchron- 
ous motor. 
Give the connection diagram of a three phuse synchronous 
motor receiving its current from a 110 volt circuit. 
State the principal advantages and disadvantages of syn- 
chronous motors. 
What condition is necessary in order that the motor shall 
maintain an absolutely constant speed ? 
What is the average momentary overload capacity of 
standard synchronous motors ? 
State the different kinds of starting arrangements usually 
employed for synchronous motors. 
By what means can a motor be made to start up, without 
the use of an outside starting arrangement ? 
What is the obtainable starting torque with this particular 
arrangement ? 
Calculate the input in KVA. and the current per phase, of 
an 800 H.P., 4,000 volts, 50 cycles, two phase synchron- 
ous motor, which has an efficiency of 96% at full load 
with a power factor of cos p = .95. 
State the most practical way of determining the approxi- 
mate overload capacity of a synchronous motor. 
Give the formula for the approximate maximum load 
capacity of a synchronous motor. 
