Worksheets141 S3 Generators
Total questions: 20
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
1. What is the primary principle behind an AC power generator?
a)
a) Electromagnetism
b)
b) Electrostatics
c)
c) Thermal expansion
d)
d) Chemical reaction
2.
2. What is a basic component of an AC generator?
a)
a) Transformer
b)
b) Solar cell
c)
c) Winding (loop of conductor)
d)
d) Battery
3.
3. How is the output voltage of a simple generator transferred to an external circuit?
a)
a) Using fuses
b)
b) Through slip rings and brushes
c)
c) Using transformers
d)
d) Via batteries
4.
4. What are slip rings in a generator typically made from?
a)
a) Copper
b)
b) Steel
c)
c) Carbon
d)
d) Aluminum
5.
5. What kind of generator is used when only small amounts of power are required?
a)
a) Three-phase generator
b)
b) Solar generator
c)
c) Simple AC generator
d)
d) Wind turbine generator
6.
6. How many electrical windings does a three-phase generator have?
a)
a) 2
b)
b) 3
c)
c) 4
d)
d) 5
7.
7. What is the angular separation between the windings of a three-phase generator?
a)
a) 90º
b)
b) 120º
c)
c) 180º
d)
d) 360º
8.
8. Which component in a three-phase generator helps induce an emf into the windings?
a)
a) Stator
b)
b) Rotor
c)
c) Shaft
d)
d) Bearings
9.
9. What is the role of the DC exciter coil in a generator?
a)
a) It produces voltage directly
b)
b) It cools the system
c)
c) It magnetizes the rotor
d)
d) It controls speed
10.
10. Why are most electric power systems generated as three-phase power instead of single-phase?
a)
a) Higher power transmission cost
b)
b) Easier maintenance
c)
c) Greater capacity for the same size generator
d)
d) Lower maintenance cost
11.
11. What type of rotor is typically used in slow-speed hydroelectric generators?
a)
a) Cylindrical rotor
b)
b) Salient pole rotor
c)
c) Axial flux rotor
d)
d) Brushless rotor
12.
12. How does a salient pole rotor generate electricity?
a)
a) By spinning the rotor inside the stator
b)
b) Through chemical reaction
c)
c) Using wind energy
d)
d) By using slip rings to transfer current
13.
13. Why is hydrogen preferred as the cooling medium in slow-driven generators?
a)
a) It is cheaper than air
b)
b) It increases efficiency and reduces windage losses
c)
c) It is safer
d)
d) It provides mechanical strength
14.
14. Which type of rotor is used for higher-speed generators like steam turbines?
a)
a) Salient pole rotor
b)
b) Cylindrical rotor
c)
c) Brushless rotor
d)
d) Induction rotor
15.
15. What are the conductors in a cylindrical rotor made from?
a)
a) Steel
b)
b) Aluminum
c)
c) Copper bars
d)
d) Iron filings
16.
16. What determines the speed and power output of a cylindrical generator rotor?
a)
a) The material used for the rotor
b)
b) The speed of the turbine
c)
c) The thickness of the windings
d)
d) The rotor’s surface area
17.
17. Two-pole generators are typically used in which type of power plants?
a)
a) Hydroelectric power plants
b)
b) Coal-fired steam units
c)
c) Wind turbines
d)
d) Nuclear power plants
18.
18. What is the typical rotational speed of a two-pole generator in coal-fired steam units?
a)
a) 3000 rpm
b)
b) 3600 rpm
c)
c) 1800 rpm
d)
d) 1000 rpm
19.
19. Which power plant typically uses four-pole rotors?
a)
a) Solar power plants
b)
b) Hydroelectric power plants
c)
c) Nuclear power plants
d)
d) Coal-fired power plants
20.
20. What is a major reason four-pole rotors are used in nuclear power plants?
a)
a) Nuclear steam has higher energy
b)
b) The lower steam temperature and pressure in nuclear plants require larger turbines
c)
c) Nuclear plants need faster rotational speeds
d)
d) Four-pole rotors generate more emissions
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