A Quiz On Basic Power Electronics
Electricity is used to run machines around us from something as small as a toothbrush to an airplane or ship. Power electronics is the application of solid-state electronics to the control and conversion of electric power. Take up the quiz on basic power electronics below and get to understand more.
- 1.
A silicon controlled rectifier (SCR) is a
- A.
Unijunction device.
- B.
Device with 3 junctions.
- C.
Device with 4 junctions.
- D.
None of the above.
Correct Answer
B. Device with 3 junctions.Explanation
An SCR, or silicon controlled rectifier, is a device with 3 junctions. This means that it has 3 layers of semiconductor material, each forming a junction with the adjacent layer. The three junctions in an SCR are the anode-cathode junction, the anode-gate junction, and the cathode-gate junction. These junctions allow the SCR to control the flow of current in a circuit by acting as a switch that can be turned on and off.Rate this question:
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- 2.
Which of the following finds application in speed control of a dc motor?
- A.
FET
- B.
NPN transistor.
- C.
SCR.
- D.
None of the above.
Correct Answer
C. SCR.Explanation
The correct answer is SCR. SCR stands for Silicon Controlled Rectifier, which is a type of semiconductor device that can be used for speed control of a DC motor. SCR allows for precise control of the motor's speed by regulating the amount of power delivered to the motor. It is commonly used in industrial applications where precise speed control is required. FET and NPN transistor are not typically used for speed control of DC motors.Rate this question:
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- 3.
A chopper can be used to step up a dc voltage.
- A.
True.
- B.
False.
Correct Answer
A. True.Explanation
A chopper is an electronic circuit that can convert a DC voltage to a higher or lower level through the use of switching components. By controlling the switching frequency and duty cycle, a chopper can step up the voltage level of a DC source. Therefore, it is true that a chopper can be used to step up a DC voltage.Rate this question:
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- 4.
A dc chopper converts directly from dc to dc.
- A.
True.
- B.
False.
Correct Answer
A. True.Explanation
A DC chopper is an electronic circuit that converts a fixed DC voltage to a variable DC voltage. It does this by chopping the fixed DC voltage into a series of pulses and then filtering and averaging the output voltage. Therefore, it directly converts from DC to DC, making the statement true.Rate this question:
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- 5.
A triac is a
- A.
2 terminal switch.
- B.
2 terminal bilateral switch.
- C.
3 terminal unilateral switch.
- D.
3 terminal bidirectional switch.
Correct Answer
D. 3 terminal bidirectional switch.Explanation
A triac is a three-terminal bidirectional switch because it can conduct current in both directions when triggered by a small gate current. It is commonly used in AC power control applications, where it can control the flow of current in both positive and negative half-cycles of the AC waveform. The three terminals of a triac are the main terminal 1 (MT1), main terminal 2 (MT2), and the gate terminal. The bidirectional switching capability of a triac makes it suitable for controlling power to devices that require AC voltage, such as lamps, motors, and heaters.Rate this question:
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Current Version
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Jan 19, 2023Quiz Edited by
ProProfs Editorial Team -
May 11, 2012Quiz Created by
Pteichrob
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