Basic Electronics MCQs | Basic Electronics Multiple Choice Questions with Answers

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Questions
1 A Triac has three terminals viz ………………
A Drain, source, gate
B Two main terminal and a gate terminal
C Cathode, anode, gate
D None of the above

Answer: Two main terminal and a gate terminal
2 A diac has ………….. terminals
A Two
B Three
C Four
D None of the above

Answer: Two
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3 Power electronics essentially deals with control of a.c. power at …………
A Frequencies above 20 kHz
B Frequencies above 1000 kHz
C Frequencies less than 10 Hz
D 50 Hz frequency

Answer: 50 Hz frequency
4 To turn on UJT, the forward bias on the emitter diode should be …………… the peak point voltage
A Less than
B Equal to
C More than
D None of the above

Answer: More than
5 A diac is simply ………………
A A single junction device
B A three junction device
C A triac without gate terminal
D None of the above

Answer: A triac without gate terminal
6 The current out of an ideal current source is
A Zero
B Constant
C Load resistance dependent
D Internal resistance dependent

Answer: Constant
7 In a constant voltage DC circuit, when the resistance increases, the current will
A Decrease
B Stop
C Increase
D Remains constant

Answer: Decrease
8 The triac is …………….
A Like a bidirectional SCR
B A four-terminal device
C Not a thyristor
D Answers (1) and (2)

Answer: Like a bidirectional SCR
9 The UJT may be used as ……………….
A Am amplifier
B A sawtooth generator
C A rectifier
D None of the above

Answer: A sawtooth generator
10 The voltage out of an ideal voltage source is
A Zero
B Constant
C Load resistance dependent
D Internal resistance dependent

Answer: Constant
11 The unit of electrical resistance is
A Volt
B Amp
C Ohm
D Coulomb

Answer: Ohm
12 After peak point, the UJT operates in the ……………. region
A Cut-off
B Saturation
C Negative resistance
D None of the above

Answer: Negative resistance
13 Between the peak point and the valley point of UJT emitter characteristics we have ………….. region
A Saturation
B Negative resistance
C Cut-off
D None of the above

Answer: Negative resistance
14 In a UJT, the p-type emitter is ……………. doped
A Lightly
B Heavily
C Moderately
D None of the above

Answer: Heavily
15 The device that does not have the gate terminal is ……………….
A Triac
B FET
C SCR
D Diac

Answer: Diac
16 A triac has …………….. semiconductor layers
A Two
B Three
C Four
D Five

Answer: Four
17 When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ………………..
A High
B Low
C Extremely low
D None of the above

Answer: High
18 When the temperature increases, the inter-base resistance (RBB) of a UJT ………….
A Increases
B Decreases
C Remains the same
D None of the above

Answer: Increases
19 A diac is turned on by …………………
A A breakover voltage
B Gate voltage
C Gate current
D None of the above

Answer: A breakover voltage
20 Which of the following is not a characteristic of UJT?
A Intrinsic stand off ratio
B Negative resistance
C Peak-point voltage
D Bilateral conduction

Answer: Bilateral conduction

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