Fundamentally, a thyristor functions as________?
Show answer Hide answer
Answer: A. PNPN device
Explanation
A thyristor consists of alternating p-type and n-type semiconductor layers forming a four-layer structure. The internal architecture of a thyristor features alternating PNPN semiconductor doping regions. Semiconductor physics classifies this specific four-layer arrangement strictly as a PNPN device. Thyristors are solid-state semiconductor switches capable of handling very high voltages and currents. Diacs and triacs are separate family members with distinct bidirectional switching characteristics. Silicon controlled rectifiers represent the most common commercial type of thyristor device.
Thyristors form the backbone of high-voltage direct current transmission and industrial motor control. Their latching capability allows them to remain conducting after a brief gate trigger pulse. Engineers use these robust switches for power rectification and AC voltage regulation tasks. A diac and triac combination describes distinct bidirectional devices rather than basic thyristor layers. A set of SCRs represents assembled circuits rather than the fundamental semiconductor layer structure. Grouping SCRs, diacs, and triacs together confuses distinct component classifications with basic thyristor physics.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What occurs if the air gap inside an induction motor is increased?
Show answer Hide answer
Answer: B. the power factor will decrease
An increased air gap raises magnetic reluctance, demanding higher magnetizing current from the supply. Higher magnetizing current degrades the overall operating power factor of the induction motor. Magnetic flux struggle...
Q2. In a 3 phase half wave rectifier with a firing angle below 90 degree, the average dc output voltage becomes__________________?
Show answer Hide answer
Answer: A. Positive
In a 3-phase half-wave rectifier, rectifying alternating current produces a pulsating direct current output voltage. A firing angle kept below 90 degrees ensures that the instantaneous voltage waveform remains predominan...
Q3. For a 3 phase CSI with balanced and 120 degree out of phase line output voltages, chopping angles are utilized exclusively to eliminate harmonics at frequencies
Show answer Hide answer
Answer: D. All of these
Chopping angles in three-phase current source inverters target multiple specific lower-order harmonic frequencies. Mathematical optimization of switching angles eliminates the fifth, seventh, and eleventh harmonic compon...
Q4. A 10 kV, 5.5 kA switch is constructed using 60 thyristors connected in series-parallel arrays. Each thyristor is rated for 1.2 kV and 1 kA, utilizing 6 parallel paths. Calculate the switch efficiency______________________?
Show answer Hide answer
Answer: A. 76.3 %
Switch efficiency calculation compares aggregate component ratings against the total system capacity requirements. Dividing total effective utilized capacity by installed component capacity yields the precise percentage....
Q5. A logic circuit utilizes positive logic when______________?
Show answer Hide answer
Answer: D. logic 0 voltage level is lower than logic 1 voltage level
In positive logic convention, a higher voltage level represents the binary high or logic 1 state. Conversely, a lower voltage level represents the binary low or logic 0 state in this convention. This established voltage...
Q6. During ac-dc conversion, closing the switch means the algebraic sum of loop voltages is____________?
Show answer Hide answer
Answer: B. Non zero
Circuit switching action introduces transient voltages that prevent immediate zero algebraic sum across loops. Kirchhoff's voltage law applies instantaneously, but switching transients create temporary non-zero loop volt...