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WorksheetsUJT
Total questions: 15
Worksheet time: 8mins
A UJT has ……………….
One pn junction
Two pn junctions
Three pn junctions
None of the above
In a UJT, the p-type emitter is ……………. doped
Lightly
Heavily
Moderately
None of the above
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
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
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
A UJT is sometimes called …………. diode
Low resistance
High resistance
Single-base
Double-base
When the temperature increases, the inter-base resistance (RBB) of a UJT ………….
Increases
Decreases
Remains the same
None of the above
Between the peak point and the valley point of UJT emitter characteristics we have ………….. region
Saturation
Negative resistance
Cut-off
None of the above
The device that exhibits negative resistance region is ………………..
Diac
Triac
Transistor
UJT
The UJT may be used as ……………….
Am amplifier
A sawtooth generator
A rectifier
None of the above
After peak point, the UJT operates in the ……………. region
Cut-off
Saturation
Negative resistance
None of the above
Which of the following is not a characteristic of UJT?
Intrinsic stand off ratio
Negative resistance
Peak-point voltage
Bilateral conduction
The VI characteristics of UJT is
Similar to CE with a linear and saturation region
Similar to FET with a linear and pinch off region
Similar to tunnel diode in some respects
Similar to PN junction diode in some respects
UJT when used for triggering an SCR, has the waveform
Sine wave
Square Wave
Sawtooth wave
Trapezoidal wave
The UJT terminals are
E, B1 and B2
E1, E2 and B
E, G and C
G, S and D
