Problems
Author: E.E. Kimberly

Problem 
Answer 
1 
A 60cycle, 120/60volt phaseshifter is to be built by using a centertapped transformer and an inductance coil of 3 henrys and 300 ohms resistance. Calculate the magnitude of the control voltage and its phase angle with respect to the secondary terminal voltage if the series resistor of the phaseshifter has a resistance of 2000 ohms. Calculate the phase angle for alternate positions of the phaseshifter elements. 

2 
The accompanying circuit is set up and found to be correct. On which end of the transformer primary OF should the dot be placed? If the load inductance L is large enough to insure constant tube current during the conduction period, what is the average load current for a firing angle of 30 degrees? The platetoplate voltage is 282.8 volts rms and R_{L} is 20 ohms.


