UJT MCQS
SCR MCQS | MULTIPLE CHOICE QUESTIONS
1.What are the working regions of a unijunction transistor?
- a) Linear region
- b) Negative Resistance region
- c) Saturation region
- d) Cut-off region
2.How many terminals are there in a unijunction transistor?
- a) 1
- b) 2
- c) 3
- d) 4
3.What are unijunction transistors used for?
- a) Amplifying a circuit
- b) Circuit breaker
- c) Splitting device
- d) On-Off switching device
4.What are the terminals of a unijunction transistor?
- a) Collector, Base and Emitter
- b) Emitter, Base 1 and Base 2
- c) Gate, Drain and Source
- d) Gate, Drain, Body and Source
5.Which type of material is the channel of a unijunction transistor made up of?
- a) PN type
- b) It doesn’t affect the working
- c) P type
- d) N type
6.Unijunction transistors have unidirectional conductivity and positive impedance characteristics.
- a) True
- b) False
7.What is the generalized value for the voltage across resistor RB1 in a unijunction transistor?
- a) VRB1 = (RB2 / RB1 + RB2) × VBB
- b) VRB1 = (RB2 / RB1 – RB2) × VBB
- c) VRB1 = (RB1 / RB1 + RB2) × VBB
- d) VRB1 = (RB1 / RB1 – RB2) × VBB
UJT MCQS
8.A UJT has ___________.
- a) Two pn junctions
- b) One pn junction
- c) Three pn junctions
- d) None of the above
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9.The UJT may be used as ___________.
- a) An amplifier
- b) A sawtooth generator
- c) A rectifier
- d) None of the above
10.In a UJT, the p-type emitter is ……………. doped
- Lightly
- Heavily
- Moderately
- None of the above
11.When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ………………..
- High
- Low
- Extremely low
- None of the above
12.When a UJT is turned ON, the resistance between emitter terminal and lower base terminal …………….
- Remains the same
- Is decreased
- Is increased
- None of the above
13.To turn on UJT, the forward bias on the emitter diode should be …………… the peak point voltage
- Less than
- Equal to
- More than
- None of the above
14.A UJT is sometimes called …………. diode
- Low resistance
- High resistance
- Single-base
- Double-base
15.When the temperature increases, the inter-base resistance (RBB) of a UJT ………….
- Increases
- Decreases
- Remains the same
- None of the above
16.Between the peak point and the valley point of UJT emitter characteristics we have ………….. region
- Saturation
- Negative resistance
- Cut-off
- None of the above
17.After peak point, the UJT operates in the ……………. region
- Cut-off
- Saturation
- Negative resistance
- None of the above
18.Which of the following is not a characteristic of UJT?
- Intrinsic stand off ratio
- Negative resistance
- Peak-point voltage
- Bilateral conduction
