WorksheetsElectronics & motors
Total questions: 10
Worksheet time: 3mins
The main advantage of an IGBT over a MOSFET is:
Lower input capacitance
Higher switching speed
Better high-voltage handling capability
Lower conduction loss at low voltage
The speed of an induction motor mainly depends on:
Rotor resistance
Supply frequency and number of poles
Stator current
D) Supply voltage
Slip in an induction motor is defined as:
Ratio of mechanical losses to input power
Difference between synchronous and rotor speed, divided by synchronous speed
Difference between stator and rotor current
Ratio of rotor speed to synchronous speed
In a Variable Frequency Drive (VFD), the function of the inverter stage is to:
Convert DC back to variable-frequency AC
Control current magnitude
Convert AC to DC
Provide isolation between input and output
In a DC shunt motor, if the field current decreases, the speed will:
Decrease
Increase
Remain constant
Reverse direction
The main function of a DC motor controller is to:
Measure rotor speed
Protect motor windings
Regulate torque only
Control voltage and current to manage speed and torque
The resistance of a conductor increases when:
The material has higher conductivity
Its length decreases
Its temperature increases
Its cross-sectional area increases
Which communication protocol is commonly used for industrial automation and allows master-slave communication?
CAN
USB
SPI
Modbus
In a BLDC motor, rotor position is typically detected by:
Using a potentiometer
Using a tachometer
Using Hall effect sensors
Using optical encoders only
In a simple circuit, the resistance R can be calculated using which of the following formulas?
R=V×I
R=I/V
R=V/I
R=V+I
