What is the primary function of an isolation transformer?
A Increase voltage
B Provide isolation
C Control temperature
D Reduce current
An isolation transformer is used to electrically isolate two circuits while allowing power to pass between them. It provides safety by preventing the transmission of electrical faults between circuits, especially in sensitive equipment or high‐risk environments.
What type of transformer is typically used in high-voltage power transmission?
A Isolation transformer
B Step-down transformer
C Power transformer
D Distribution transformer
Power transformers are designed to handle high voltages and are used in power transmission systems. They step up voltage for efficient long-distance transmission, reducing losses due to resistance and improving energy delivery efficiency.
Which transformer is most commonly used in residential areas?
A Autotransformer
B Isolation transformer
C Power transformer
D Distribution transformer
Distribution transformers are commonly used in residential areas to step down the high voltage from transmission lines to a lower, usable voltage. They ensure that electrical power is safely delivered to homes and businesses at standard voltage levels.
What is the main characteristic of an isolation transformer?
A No direct electrical connection
B Increased power rating
C Voltage regulation
D No load losses
An isolation transformer has no direct electrical connection between its primary and secondary windings. Instead, it uses electromagnetic induction to transfer power, providing electrical isolation to protect against shocks and to reduce electrical noise.
What does parallel operation of transformers help achieve?
A Energy storage
B Voltage increase
C Load sharing
D Current decrease
When transformers are operated in parallel, they share the load between them, providing greater capacity and improving system reliability. Parallel operation ensures that the load is distributed across multiple transformers, reducing the risk of overloading any single transformer.
What is a key consideration when operating transformers in parallel?
A Same frequency
B Matching impedance
C Equal voltage
D Same core material
For successful parallel operation, transformers must have matching impedance. If the impedance is mismatched, it could lead to uneven load sharing, with one transformer carrying too much load, potentially leading to overheating or failure.
Which of these transformers is primarily used to isolate different parts of an electrical system?
A Isolation transformer
B Power transformer
C Autotransformer
D Distribution transformer
Isolation transformers are used to electrically separate parts of an electrical system, providing safety by preventing direct current flow between circuits. They are commonly used in sensitive equipment or environments where isolation is necessary for safety.
What is one of the main advantages of using a distribution transformer?
A High efficiency
B High voltage capacity
C Voltage reduction
D High frequency operation
The main function of a distribution transformer is to step down high voltage from transmission lines to lower voltages for use in residential or commercial applications. This voltage reduction makes it safe for household appliances and other electrical systems.
How does an autotransformer differ from a standard transformer?
A Higher efficiency
B Two windings
C Higher voltage
D Single winding
An autotransformer uses a single winding that serves as both the primary and secondary winding. This design allows for more efficient and cost-effective voltage conversion compared to standard transformers, which use separate windings for each side.
What type of transformer is used to step up the voltage for power transmission?
A Distribution transformer
B Step-up transformer
C Isolation transformer
D Step-down transformer
Step-up transformers are used in power transmission systems to increase the voltage for efficient long-distance transmission. High voltage reduces energy losses caused by the resistance of transmission lines, ensuring more efficient delivery of power over long distances.
What is a common application of an isolation transformer?
A Electrical shock prevention
B Frequency conversion
C Voltage regulation
D Power generation
Isolation transformers are often used to prevent electrical shock by isolating the connected equipment from the power source. This is especially important in sensitive or hazardous environments, such as medical equipment or laboratory instruments.
In parallel operation, what ensures that transformers share load evenly?
A Core material matching
B High voltage capacity
C Impedance matching
D Voltage regulation
Impedance matching is essential in parallel operation to ensure that transformers share the load evenly. If the impedance is not matched, one transformer might carry more load, causing it to overheat and possibly fail.
What is the characteristic of a power transformer?
A Small size
B Low voltage operation
C Limited load capacity
D High voltage and current capacity
Power transformers are designed to handle high voltage and current capacity, making them suitable for large-scale power generation and transmission systems. They step up or step down voltages in high-power applications, ensuring efficient electricity delivery over long distances.
Why is the efficiency of a transformer important?
A Minimizes energy loss
B Increases current
C Improves voltage regulation
D Reduces size
Efficiency is a key factor in transformer design and operation because it minimizes energy loss during voltage conversion. Efficient transformers convert most of the input electrical energy into useful output, reducing the amount of heat and waste energy generated during operation.
Which transformer is most suitable for voltage isolation in critical equipment?
A Distribution transformer
B Autotransformer
C Isolation transformer
D Power transformer
Isolation transformers are ideal for providing voltage isolation in critical equipment, ensuring safety and protecting sensitive components from faults or disturbances in the power supply. They are widely used in medical, laboratory, and industrial applications.