Auto Transformers Flashcards
What is an auto transformer?
An auto transformer is a type of electrical transformer that has a single winding that acts as both the primary and secondary winding.
True or False: An auto transformer can step up or step down voltage.
True
Fill in the blank: The main advantage of an auto transformer is its __________ efficiency.
higher
What are the two main configurations of an auto transformer?
Step-up and step-down configurations.
What is the primary function of an auto transformer?
To change the voltage level in an electrical circuit.
Multiple Choice: Which of the following is a disadvantage of an auto transformer? A) Increased efficiency B) Smaller size C) Lack of electrical isolation D) Lower cost
C) Lack of electrical isolation
In what applications are auto transformers commonly used?
In applications like voltage regulation, power supply, and audio equipment.
True or False: Auto transformers are more expensive than traditional transformers.
False
What is the main difference between an auto transformer and a traditional transformer?
An auto transformer has a single winding, while a traditional transformer has separate primary and secondary windings.
Fill in the blank: The efficiency of an auto transformer can be as high as __________ percent.
98
What is the typical use of an auto transformer in power systems?
To adjust voltage levels to match the requirements of different loads.
Multiple Choice: Which of the following is NOT a type of auto transformer? A) Buck-Boost Transformer B) Isolation Transformer C) Step-Up Transformer D) Step-Down Transformer
B) Isolation Transformer
What is the formula for calculating the transformation ratio of an auto transformer?
The transformation ratio is the ratio of the output voltage to the input voltage.
True or False: Auto transformers can only be used in low voltage applications.
False
What type of load is most suitable for an auto transformer?
Constant power loads.
Fill in the blank: An auto transformer typically has __________ losses compared to a conventional transformer.
lower
What is meant by ‘tap changing’ in the context of auto transformers?
It refers to the ability to change the voltage output by selecting different connection points on the winding.
Multiple Choice: Which component is essential for the operation of an auto transformer? A) Capacitor B) Inductor C) Resistor D) Winding
D) Winding
What safety concern is associated with auto transformers?
The lack of electrical isolation between the primary and secondary circuits.
True or False: Auto transformers are widely used in railway systems.
True
In terms of physical size, how do auto transformers compare to conventional transformers?
Auto transformers are generally smaller and lighter.
What is the impact of load variations on the performance of an auto transformer?
Load variations can affect the voltage output and efficiency.
Fill in the blank: An auto transformer can be used in __________ applications due to its compact design.
space-constrained
What is the role of the common winding in an auto transformer?
It serves as both the input and output connection, allowing for voltage transformation.
Multiple Choice: Which of the following is a common application of an auto transformer? A) Power distribution B) Motor starting C) Voltage stabilization D) All of the above
D) All of the above
