SYNCHRONOUS MACHINE

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

What does a motor do?

• Moves up and down
• Rotates without Electricity 
• It does
• Uses Electricity to cause motion (usually, rotational motion)

What is the relationship between electrical current and magnetic field strength in an electromagnet?

• When current is increased, magnetic field strength increases
• When current is increased the strength of magnetic field decreases
• When 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.

State TWO type of rotor in Synchronous Generator

• Field winding

• Armature winding

• Salient pole

• Cylindrical (non-salient/round)

State TWO type of winding in Synchronous Generator

• Field winding

• Armature winding

• Salient pole

• Cylindrical (non-salient/round)

Which type of rotor require large no of poles?

• Salient pole

• Cylindrical pole

• Squirrel cage pole

• Wound pole

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.

What is load condition for E_a = V_phase in synchronous generator?

• full load

• no load

• half load

• rated load

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

which of the following the magnetic field current is supplied by a magnetic induction (transformer action) into their field windings

• Induction machines
• synchronous machines
• transformers
• Ac generators