WorksheetsElectric Machines Quiz
Total questions: 15
Worksheet time: 8mins
What type of motors have a constant speed proportional to the frequency of the network?
Induction Motors
Universal Motors
Synchronous Motors
Asynchronous Motors
What is the difference between the motor speed and synchronous speed called?
Efficiency
Power
Torque
Slip
What type of rotor is commonly known as a 'squirrel cage'?
Salient Pole Rotor
Squirrel Cage Rotor
Wound Rotor
Permanent Magnet Rotor
Which type of motor is most widely used in industry due to its robustness?
Stepper Motors
Synchronous Motors
Induction Motors
Servo Motors
What is the main characteristic of a synchronous motor?
Speed is constant
Speed varies with load
Speed is always zero
Speed is always high
What is the purpose of the stator in an electric machine?
To create a magnetic field
To rotate
To provide power
To cool the motor
What type of current is essential for the operation of electric machines?
Pulsating Current
Alternating Current
Static Current
Direct Current
What does the efficiency of a motor measure?
Size of the motor
Speed of the motor
Weight of the motor
Power output vs power input
What is a key benefit of high-efficiency motors?
Larger size
Reduced energy costs
Higher noise levels
Increased energy consumption
What is the role of lubrication in motor maintenance?
To increase friction
To add weight
To reduce friction
To cool the motor
What is the main function of the rotor in an electric machine?
To create a magnetic field
To rotate and produce torque
To connect to the power supply
To cool the machine
What is the purpose of regular inspection in motor maintenance?
To increase power
To avoid premature failures
To make the motor heavier
To change the motor type
What is the main principle behind electromagnetic induction?
Movement of magnets
Change in magnetic field induces current
Static electricity
Heat generation
What type of electric machine uses a wound rotor?
Stepper Motor
Universal Motor
Induction Motor
Synchronous Motor
What is a common application of electric machines in transportation?
Heating systems
Television sets
Electric vehicles
Cooking appliances
