Q. Which type of transformer is commonly used in power distribution systems?
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Auto transformer
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Solution
Step-down transformers are used in distribution systems to reduce high transmission voltages to lower levels suitable for consumer use.
Correct Answer:
B
— Step-down transformer
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Q. Which type of transformer is used for impedance matching?
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Autotransformer
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Solution
An isolation transformer is used for impedance matching and to isolate different parts of a circuit.
Correct Answer:
C
— Isolation transformer
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Q. Which type of transformer is used to connect two systems operating at different frequencies?
A.
Step-up transformer
B.
Step-down transformer
C.
Phase-shifting transformer
D.
Frequency converter transformer
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Solution
Phase-shifting transformers are used to connect systems operating at different frequencies, allowing for controlled power flow.
Correct Answer:
D
— Frequency converter transformer
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Q. Which type of transformer is used to increase voltage?
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Auto transformer
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Solution
A step-up transformer increases the voltage from the primary to the secondary winding.
Correct Answer:
A
— Step-up transformer
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Q. Which type of transistor is a BJT?
A.
Unipolar
B.
Bipolar
C.
Field-effect
D.
Insulated-gate
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Solution
A BJT (Bipolar Junction Transistor) is a bipolar device that uses both electron and hole charge carriers.
Correct Answer:
B
— Bipolar
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Q. Which type of transistor is commonly used for switching applications?
A.
BJT
B.
FET
C.
MOSFET
D.
All of the above
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Solution
All types of transistors, including BJTs, FETs, and MOSFETs, can be used for switching applications, but MOSFETs are particularly popular due to their efficiency.
Correct Answer:
D
— All of the above
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Q. Which type of transmission line configuration is most commonly used for high voltage transmission?
A.
Single-phase
B.
Two-phase
C.
Three-phase
D.
Multi-phase
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Solution
Three-phase transmission line configurations are most commonly used for high voltage transmission due to their efficiency and balance.
Correct Answer:
C
— Three-phase
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Q. Which type of transmission line is most commonly used for long distances?
A.
Overhead lines
B.
Underground cables
C.
Submarine cables
D.
Microgrid connections
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Solution
Overhead lines are the most common type of transmission line used for long distances due to their cost-effectiveness.
Correct Answer:
A
— Overhead lines
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