ALTERNATOR 4
Master Your Alternator Knowledge
Test your understanding of alternators with this comprehensive quiz designed for electrical engineering enthusiasts. Whether you're a student, teacher, or simply passionate about power systems, this quiz challenges you to apply your knowledge effectively.
Key Features:
- 10 thought-provoking questions
- Multiple-choice format for clarity
- Instant feedback on your answers
31. The power drawn by the prime-mover of an alternator, under no-load conditions, goes to ___________
Meet copper losses both in armature and rotor windings
Produce power in armature
Meet no-load losses
produce e.m.f. In armature winding
32. Overheating of generator’s winding ______________
Reduces life of the machine
Does not have any significant effect
Reduces generated voltage
Reduces power factor
33. The regulation of an alternator is likely to be negative in case of ____________
Lagging power factor of the load
Leading power factor of the load
High speed alternators
Low speed alternators
34. Two alternators are to be put in parallel. Which of the following factors should be identical for both?
Frequency
Phase sequence
Voltage
All of the above
35. An alternator driven by a Francis hydraulic turbine is a _________ alternator
Low speed
Medium speeed
High speed
Low or medium speed
36. The distribution factor, in alternators, is defined as the ratio of e.m.fs. of __________
Distribution winding to full pitch winding
concentrated winding to distributed winding
Distributed winding to concentrated winding
Full pitch winding to distributed winding
37. When an alternator is supplying unity power factor load, the armature reaction will produce ____________
Distortion of the main field
Magnetisation of the main field
Demagnetisation of the main field
None of the above
38. In an alternator, when the load power factor is unity ____________
The armature flux will be demagnetizing
The armature flux will be crosss magnetizing
The armature flux will reduce to zero
The armature flux will have square wave form
39. Three-phase alternators are invariable star-connected because __________
Higher terminal voltage is obtained
Less turns of wire are required
Small conductors can be used
Magnetic losses are the minimum
40. Which of the following conditions does not have to be met by alternators working in parallel?
Alternators must operate at the same frequency
Machine must have the same phase rotation
The terminal voltage of each machine must be the same
The machines must have equal kVA ratings
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