Induction and Synchronous Machines MCQs (Part-8)

What is the primary cause of losses in an induction motor?

A Friction losses
B Core losses
C Rotor losses
D Stator losses

What is the effect of increasing the load on the efficiency of an induction motor?

A Efficiency increases
B Efficiency fluctuates
C Efficiency decreases
D Efficiency remains constant

What is the impact of a poor power factor on an induction motor?

A Reduced speed
B Increased torque
C Reduced voltage
D Increased current draw

How can the power factor of an induction motor be improved?

A By increasing slip
B By increasing load
C By adding a capacitor
D By reducing supply voltage

What is the typical effect of higher slip in an induction motor?

A Decreased speed
B Increased current
C Decreased torque
D Increased efficiency

What are the main losses in a synchronous motor?

A Copper losses
B Hysteresis and eddy current losses
C Rotor and friction losses
D Core and stator losses

How does an increase in temperature affect the efficiency of an induction motor?

A Decreases efficiency
B No effect
C Increases torque
D Increases efficiency

What is the primary factor that affects the power factor of an induction motor?

A Slip
B Load
C Voltage
D Speed

What is the effect of running an induction motor under no-load conditions?

A Increased slip
B Low current
C Low power factor
D High efficiency

What type of losses are caused by the resistance of the rotor windings in an induction motor?

A Copper losses
B Iron losses
C Core losses
D Friction losses

Which of the following increases as the efficiency of an induction motor improves?

A Starting torque
B Core losses
C Power factor
D Slip

What type of motor is more susceptible to losses due to harmonics?

A Universal motor
B Induction motor
C Permanent magnet motor
D Synchronous motor

What happens to the efficiency of an induction motor when the load is under-loaded?

A Efficiency decreases
B No effect on efficiency
C Speed decreases
D Efficiency increases

Which type of loss occurs in the iron core of an induction motor?

A Windage loss
B Copper loss
C Friction loss
D Core loss

How does the efficiency of a synchronous motor compare to an induction motor?

A Same efficiency
B Higher efficiency
C Lower efficiency
D Depends on load