Questions and Answers
What is the primary material used for slip rings in generators?
Copper
What is the primary advantage of FM over AM?
Less bandwidth required
What is the maximum efficiency of a half-wave rectifier?
40.6%
Study Notes
Electrical Engineering Knowledge Test Summary
- Steel is difficult to magnetize due to its high density, high retentivity, and low permeability.
- Modern capacitors with high capacitance in small size use dielectrics such as paper, rubber, ceramic, or mylar.
- A diode is a nonlinear device.
- In a shunt generator, voltage builds up until it is constrained by speed limitation, armature heating, and saturation of iron.
- Slip rings in generators are made of materials such as steel, copper, bakelite, or mica.
- For proper parallel operation, AC polyphaser alternators must have the same speed, kVA rating, voltage rating, and excitation.
- The series field of a short-shunt compound DC generator is excited by external current.
- The reciprocal of permeability is reluctivity.
- The RMS value and mean value are the same for a sine wave.
- The maximum efficiency of a half-wave rectifier is 40.6%.
- 10 ergs/sec is equal to 0.00001 kW.
- The primary advantage of FM over AM is noise immunity.
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