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University
Bipolar Junction Transistor (BJT)
15 questions
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- 1. Multiple Choice
What is the operation region of NPN Bipolar Junction Transistor (BJT) if the voltage values of VBE is 0.3V and VBC is 0.7V?
Saturation region
Cut-off region
Active region
In-active region
- 2. Multiple Choice
What is the operation region of NPN Bipolar Junction Transistor (BJT) if the voltage values of VBE is 0.7V and VBC is 0.7V?
Saturation region
Cut-off region
Active region
In-active region
- 3. Multiple Choice
The circuit shown is the Bipolar Junction Transistor that works in an active region. What happen to the collector current, Ic when the value of base resistor RB is increased?
The Ic will remain the same.
The Ic will be 0.
The Ic will increase.
The Ic will decrease.
- 4. Multiple Choice
Determine the configuration this BJT circuit.
Common Emitter
Common Base
Common Collector
Common Ground
- 5. Multiple Choice
What is the value of VBE?
Given Vcc = +22 V, Vth = 2V, Rth = 3.55 Ω, Rc = 10 kΩ and RE = 1.5 kΩ.
1.978 V
13.5 V
0.7 V
1.275 V
- 6. Multiple Choice
What is the formula of Rth to simplify the BJT voltage divider bias circuit shown in the figure?
(R1 + R1)/ (R2 x R2)
(R1 x R1) / (R2 + R2)
(R1 x R2)/ (R1 + R2)
(R1 + R2)/ (R1 x R2)
- 7. Multiple Choice
The figure shown the fixed bias circuit of BJT. What is the CORRECT formula to calculate the value of base current, IB?
VCC - IcRc − VCE - VBE - IBRB = 0
VCC + IBRB − VBE = 0
VCC - IBRB − VBE = 0
VCC + IcRc − VCE - VBE - IBRB = 0
- 8. Fill in the Blank
BJT is a device controlled by ___________
- 9. Multiple Choice
The figure shown the fixed bias circuit of BJT. What is value of base current, IB?
20.28 μA
- 20.28 mA
20.28 mA
- 20.28 μA
- 10. Multiple Choice
To solve the BJT voltage divider bias AC circuit analysis, identify which statement is incorrect?
Locate capacitors and replace them with an open circuit
Locate resistors and replace them with an open circuit
Simplified circuit using Thevenin Theorem
Locate 2 main loops which is BE loop and CE loop
- 11. Multiple Choice
What is the degree of phase shift between input and output of common emitter BJT bias circuit?
45º
90º
180º
270º
- 12. Multiple Choice
State the suitable application for BJT that works in (i) active and (ii) saturation
regions.
Active – Amplifier
Saturation – Switch
Active – Switch
Saturation –Amplifier
Active – Switch
Saturation – Switch
Active – Amplifier
Saturation –Amplifier
- 13. Multiple Choice
Parameters that determine the voltage gain of the transistor of a small
signal amplifier except
Input impedance
Output impedance
Transconductance
Resistance
- 14. Multiple Choice
Which is (are) TRUE about the operating point (Q-point) of a BJT small-signal amplifier circuit?
It is kept fixed at the centre of the active region so that input signal is well amplified
The positive half cycle gets clipped off if the Q-point is kept fixed at saturation region
The negative half cycle gets clipped off if the Q-point is kept fixed at cut-off region
All
- 15. Multiple Choice
The Q – point is best located in the active region. What is the behaviour of the collector current, IC and VCE when the BJT is operating in the active region?
VCE increase IC no changes
VCE increase IC increase
VCE increase IC zero
VCE and IC zero
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