Name the three general types of dc generators

Reference no: EM132453970

Hint: Solving some of the following depends greatly on the designated type of generator and its electrical structure. If you hove difficulty visualizing where current or voltage should be flowing, try drawing the schemotic and identifying applicable current paths.

Question 1: A 25kw, 125-V compound generator (short shunt) has a series field in which each coil has 6.5 turns. How many ampere-turns are produced by each coil?

Question 2: A short-shunt compound generator has 1000 turns per pole on the on the series field. If the shunt and series field ampere-turns are 1400 and 180, respe3ctively, calculate the power delivered to the load when the terminal voltage is 220 V. Repeat for a long-Shunt connection.

Question 3: If the no-load voltage of a separately excited generator is 125V at 900 r/min, what will be the voltage if the speed is increased to 1200 r/min? Assume constant field excitation.

Question 4: Name the 3 general types of DC generators. What specifies the type of machine?

Question 5: What is the difference in construction between a series and shunt field winding?

Question 6: A four-pole generator has a total of 800 conductors. When it is driven at 1800 rev/min its armature generates 440V. Find the required flux per pole if the armature is wound

A) Lap winding

B) Wave winding

Question 7: A 6-kW 120V Shunt generator has a field resistance of 100 ohms, and armature resistance of 1.2 ohms, and stray power losses of 220 W. Find the Rated...

A) Field current

B) Load current

C) Armature current

D) Generated voltage

E) Shunt field loss

F) Armature loss

G) Efficiency

H) Voltage regulation (assume that the generated voltage remains constant)

Question 8: A 4.8-kW, 120V long shunt compound generator has Rf = 90 ohms, Ra = 0.4 ohms, Rs = 0.08 ohms, and constant stray power losses of 200 W. Find at full load
A) Field current

B) Load current

C) Armature current

D) Generated voltage

E) Shunt field loss

F) Armature loss

G) Efficiency

Reference no: EM132453970

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