Which of the following is a common application of single-phase induction motors?
A
Heavy industrial machinery
Analysis & Theory
Single-phase induction motors are widely used in domestic water pumps because they operate on standard single-phase supply.
Why are single-phase induction motors preferred in household appliances?
A
They operate on DC power
B
They require three-phase supply
C
They are simple, economical, and operate on single-phase supply
D
They provide high torque
Analysis & Theory
Single-phase motors are suitable for homes because they are inexpensive and compatible with domestic single-phase AC supply.
Which of the following appliances uses a shaded pole single-phase induction motor?
A
Air conditioner compressor
Analysis & Theory
Shaded pole motors are used in low-torque applications like refrigerator fans due to their simple and low-cost design.
What type of single-phase motor is commonly used in ceiling fans?
D
Capacitor start-capacitor run motor
Analysis & Theory
Capacitor start-capacitor run motors provide good starting torque and smooth operation, ideal for ceiling fans.
In which of the following applications would a split-phase induction motor likely be used?
Analysis & Theory
Split-phase motors are used in medium-torque applications like washing machines due to moderate starting torque.
Why are single-phase induction motors not used in large industrial equipment?
B
They require special power supply
C
They lack sufficient torque and efficiency for heavy loads
D
They only run on batteries
Analysis & Theory
Single-phase motors are limited in torque and efficiency, making them unsuitable for large industrial equipment.
Which type of single-phase motor is used in air conditioners and refrigerators for compressor operation?
Analysis & Theory
Capacitor start motors provide high starting torque needed for compressor loads in air conditioners and refrigerators.
Which motor type is ideal for continuous running applications with low noise?
A
Capacitor start-capacitor run motor
Analysis & Theory
Capacitor start-capacitor run motors are ideal for smooth and quiet continuous operation, like in fans and coolers.
Which of the following is NOT typically powered by a single-phase induction motor?
Analysis & Theory
CNC milling machines require high precision and power, usually supplied by three-phase motors, not single-phase motors.
What is the advantage of using a single-phase motor in rural and remote areas?
A
They require internet connectivity
B
They can run on low voltage DC
C
They are compatible with easily available single-phase AC supply
D
They need three-phase power lines
Analysis & Theory
Single-phase motors are practical in rural areas where only single-phase AC power is available.