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- 1. Multiple Choice
What is an Electrical Generator
A device that creates water
A device that converts mechanical energy into electrical energy
A device that makes you go to school
a device that makes kids
- 2. Multiple ChoiceWhat does a motor do?Moves up and downRotates without ElectricityIt doesUses Electricity to cause motion (usually, rotational motion)
- 3. Multiple ChoiceWhat is the relationship between electrical current and magnetic field strength in an electromagnet?When current is increased, magnetic field strength increasesWhen current is increased the strength of magnetic field decreasesWhen the current is decreased, the strenght of the magnetic field is increased.There is an "indirect proportion," meaning, if the value of one goes up, the value of the other goes down.
- 4. Multiple Choice
State TWO type of rotor in Synchronous Generator
Field winding
Armature winding
Salient pole
Cylindrical (non-salient/round)
- 5. Multiple Choice
State TWO type of winding in Synchronous Generator
Field winding
Armature winding
Salient pole
Cylindrical (non-salient/round)
- 6. Multiple Choice
Which type of rotor require large no of poles?
Salient pole
Cylindrical pole
Squirrel cage pole
Wound pole
- 7. Multiple Choice
Which answer is correct to explain about operation of Synchronous Generator
The rotating magnetic field & the rotor rotate at the same speed
The rotating magnetic field speed is faster than rotation of rotor
The rotating of rotor is faster than magnetic field speed
The rotor rotate when current induced at rotor.
- 8. Multiple Choice
What is load condition for Ea = Vphase in synchronous generator?
full load
no load
half load
rated load
- 9. Multiple Choice
At what speed three-phase cylindrical two-pole synchronous alternator rotates when connected to a 50 Hz infinite busbar system?
1000 rpm
1500 rpm
3000 rpm
6000 rpm
- 10. Multiple Choicewhich of the following the magnetic field current is supplied by a magnetic induction (transformer action) into their field windingsInduction machinessynchronous machinestransformersAc generators
- 11. Multiple Choicewhich of the following the magnetic field current is supplied by a separate DC power source,Induction machinessynchronous machinesTransformersAC genrators
- 12. Multiple Choicewhich of the following are simple and rugged design, low-cost, low maintenance and direct connection to an AC power source?Induction machinessynchronous machinesAC generatorsTransformers
- 13. Multiple ChoiceAs the number of pole increase the synchronous speedIncreasedecreaseremain same
- 14. Multiple Choice
In a star-delta starter, The starting torque as the connection is star will be ___________ times that it will be for delta connected winding.
2/3
1/ sqrt (3)
2 / sqrt (3)
1/3
- 15. Multiple ChoiceGenerators get their mechanical power fromBatteriesPrime moverTransistorCapacitors
- 16. Multiple Choice
What two forces are required for generators and electric motors to work?magnetism and thermalelectricity and thermalelectricity and magnetismmagnetism and radiant - 17. Multiple ChoiceGenerators are devices that convert _____ energy into _____ energy.chemical; mechanicalmechanical; electricalelectrical; mechanicalpotential; kinetic
- 18. Multiple ChoiceElectric motors are devices that convert _____ energy into _____ energy.electrical; mechanicalmechanical; electricalchemical; potentialmechanical; kinetic
- 19. Multiple ChoiceWhich of these pairs of devices operate in reverse of each other?generator and motorgenerator and electromagnetmotor and electromagnetelectromagnet and resistor
- 20. Multiple Choice
Why is the stator core of Alternator laminated?
to increase heat
to control hysterisis loss
to reduce eddy current
to gain higher current
- Answer choicesTagsAnswer choicesTags