20+ Top Thyristors MCQs with Answers
A thyristor is a semiconductor device that acts as a:
a) Voltage regulator
b) Current amplifier
c) High-power switch
d) Low-power switch
Answer: c
Hint: Thyristors are used as high-power switches in various applications.
The most common type of thyristor is the:
a) Triode
b) SCR
c) Diac
d) UJT
Answer: b
Hint: Silicon-controlled rectifier (SCR) is the most common type of thyristor.
The process of turning on a thyristor is known as:
a) Forward biasing
b) Reverse biasing
c) Latching
d) Triggering
Answer: d
Hint: Triggering is the process of turning on a thyristor.
The ability of a thyristor to remain conducting even after the triggering signal is removed is known as:
a) Holding current
b) Latching current
c) Holding voltage
d) Latching voltage
Answer: b
Hint: Latching current allows the thyristor to stay in the conducting state.
Thyristors are widely used in:
a) Low-power applications
b) High-power applications
c) Digital circuits
d) Low-frequency circuits
Answer: b
Hint: Thyristors are commonly used in high-power applications.
The primary advantage of a thyristor over other semiconductor devices is its:
a) High speed
b) Low cost
c) High current-carrying capability
d) Low voltage rating
Answer: c
Hint: Thyristors can handle high currents compared to other devices.
The process of turning off a thyristor is known as:
a) Triggering
b) Latching
c) Commutation
d) Forward biasing
Answer: c
Hint: Commutation is the process of turning off a thyristor.
The voltage required to turn on a thyristor is known as:
a) Breakover voltage
b) Breakdown voltage
c) Forward voltage
d) Threshold voltage
Answer: a
Hint: Breakover voltage is the voltage required to turn on a thyristor.
In a thyristor, the anode terminal is connected to the:
a) P-type region
b) N-type region
c) Gate terminal
d) Cathode terminal
Answer: d
Hint: The cathode is the terminal connected to the anode in a thyristor.
The most common application of a thyristor is in:
a) Amplifiers
b) Voltage regulators
c) Power control circuits
d) Logic gates
Answer: c
Hint: Thyristors are widely used in power control circuits.
The process of turning off a thyristor by reducing the anode current to zero is called:
a) Reverse biasing
b) Turn-off time
c) Forward biasing
d) Turn-off recovery time
Answer: d
Hint: Turn-off recovery time is the time taken to turn off a thyristor.
The component that provides the triggering pulse to turn on a thyristor is called:
a) Cathode
b) Anode
c) Gate
d) Emitter
Answer: c
Hint: The gate terminal triggers the thyristor.
The most common method of turning on a thyristor is:
a) Applying a negative voltage to the gate terminal
b) Applying a positive voltage to the gate terminal
c) Applying a positive voltage to the anode terminal
d) Applying a negative voltage to the anode terminal
Answer: b
Hint: The gate terminal is triggered with a positive voltage.
The reverse breakdown voltage of a thyristor is usually:
a) High
b) Low
c) Moderate
d) Zero
Answer: a
Hint: Thyristors have a high reverse breakdown voltage.
The time taken for a thyristor to turn on after the triggering signal is applied is known as:
a) Forward recovery time
b) Turn-on time
c) Reverse recovery time
d) Turn-off time
Answer: b
Hint: Turn-on time is the time taken for a thyristor to turn on.
The process of turning off a thyristor by applying a reverse voltage is called:
a) Triggering
b) Reverse biasing
c) Forward biasing
d) Commutation
Answer: d
Hint: Commutation turns off the thyristor with a reverse voltage.
The minimum gate current required to trigger a thyristor is called:
a) Holding current
b) Latching current
c) Gate triggering current
d) Gate turn-on current
Answer: c
Hint: Gate triggering current is the minimum current to trigger the thyristor.
The region of a thyristor where no current flows when it is off is known as the:
a) Anode region
b) Cathode region
c) Gate region
d) Blocking region
Answer: d
Hint: The blocking region is where no current flows when the thyristor is off.
Thyristors are commonly used in applications that require:
a) Low voltage
b) High current
c) Low power dissipation
d) Low resistance
Answer: b
Hint: Thyristors are used in applications with high current requirements.
The process of turning off a thyristor by reducing the anode current to a holding value is called:
a) Forward recovery
b) Reverse recovery
c) Forward biasing
d) Reverse biasing
Answer: a
Hint: Forward recovery reduces anode current to a holding value for turning off the thyristor
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