Free Printable SYNCHRONOUS MACHINE

Worksheets

SYNCHRONOUS MACHINE

Total questions: 20

Worksheet time: 34mins

Name

Class

Date

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

10.

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

11.

which of the following the magnetic field current is supplied by a separate DC power source,

Induction machines

synchronous machines

Transformers

AC genrators

12.

which of the following are simple and rugged design, low-cost, low maintenance and direct connection to an AC power source?

Induction machines

synchronous machines

AC generators

Transformers

13.

As the number of pole increase the synchronous speed

Increase

decrease

remain same

14.

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.

Generators get their mechanical power from

Batteries

Prime mover

Transistor

Capacitors

16.

What two forces are required for generators and electric motors to work?

magnetism and thermal

electricity and thermal

electricity and magnetism

magnetism and radiant

17.

Generators are devices that convert _____ energy into _____ energy.

chemical; mechanical

mechanical; electrical

electrical; mechanical

potential; kinetic

18.

Electric motors are devices that convert _____ energy into _____ energy.

electrical; mechanical

mechanical; electrical

chemical; potential

mechanical; kinetic

19.

Which of these pairs of devices operate in reverse of each other?

generator and motor

generator and electromagnet

motor and electromagnet

electromagnet and resistor

20.

Why is the stator core of Alternator laminated?

to increase heat

to control hysterisis loss

to reduce eddy current

to gain higher current

Reset

SYNCHRONOUS MACHINE

Total questions: 20

Worksheet time: 34mins

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