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This set of Electronic Circuits 1 Multiple Choice Questions & Answers (MCQs) focuses on Electronic Circuits I Set 1
Q1 | Which of the following condition is true for cut-off mode?
- the collector current is zero
- the collector current is proportional to the base current
- the base current is non zero
- all of the mentioned
Q2 | Which of the following is true for the cut- off region in an npn transistor?
- potential difference between the emitter and the base is smaller than 0.5v
- potential difference between the emitter and the base is smaller than 0.4v
- the collector current increases with the increase in the base current
- the collector current is always zero and the base current is always non zero
Q3 | Which of the following is true for a typical active region of an npn transistor?
- the potential difference between the emitter and the collector is less than 0.5 v
- the potential difference between the emitter and the collector is less than 0.4 v
- the potential difference between the emitter and the collector is less than 0.3 v
- the potential difference between the emitter and the collector is less than 0.2 v
Q4 | Which of the following is true for the active region of an npn transistor?
- the collector current is directly proportional to the base current
- the potential difference between the emitter and the collector is less than 0.4 v
- all of the mentioned
- none of the mentioned
Q5 | Which of the following is true for a npn transistor in the saturation region?
- the potential difference between the collector and the base is approximately 0.2v
- the potential difference between the collector and the base is approximately 0.3v
- the potential difference between the collector and the base is approximately 0.4v
- the potential difference between the collector and the base is approximately 0.5v
Q6 | The potential difference between the base and the collector Vcb in a pnp transistor in saturation region is
- -0.2 v
- -0.5v
- 0.2 v
- 0.5 v
Q7 | For a pnp transistor in the active region the value of Vce (potential difference between the collector and the base) is
- less than 0.3v
- less than 3v
- greater than 0.3v
- greater than 3v
Q8 | Which of the following is true for a pnp transistor in active region?
- cb junction is reversed bias and the eb junction is forward bias
- cb junction is forward bias and the eb junction is forward bias
- cb junction is forward bias and the eb junction is reverse bias
- cb junction is reversed bias and the eb junction is reverse bias
Q9 | Which of the following is true for a pnp transistor in saturation region?
- cb junction is reversed bias and the eb junction is forward bias
- cb junction is forward bias and the eb junction is forward bias
- cb junction is forward bias and the eb junction is reverse bias
- cb junction is reversed bias and the eb junction is reverse bias
Q10 | For the circuit shown, find the quiescent point.
- none of the below
- (4v, 10ma)
- (10v, 3ma)
- (3ma, 10v)
Q11 | What is the DC characteristic used to prove that the transistor is indeed biased in saturation mode?
- ic = βib
- ic > βib
- ic >> βib
- ic < βib
Q12 | For the circuit shown, find the quiescent point.
- none of the below
- (4v, 10ma)
- (10v, 3ma)
- (3ma, 10v)
Q13 | The feature of an approximate model of a transistor is
- it helps in quicker analysis
- it provides individual analysis for different configurations
- it helps in dc analysis
- ac analysis is not possible
Q14 | 005mmhos, hre=0. Find the output impedance if the lad resistance is 5kΩ.
- 5kΩ
- 4kΩ
- 20kΩ
- 15kΩ
Q15 | A transistor has hie =2kΩ, hoe=25µmhos and hfe=60 with an unbypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance?
- 90kΩ and 50kΩ respectively
- 33kΩ and 45kΩ respectively
- 6kΩ and 40kΩ respectively
- 63kΩ and 40kΩ respectively
Q16 | A transistor has hie =1KΩ and hfe=60 with an bypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance?
- 90kΩ and 50kΩ respectively
- 33kΩ and 45kΩ respectively
- 6kΩ and 40kΩ respectively
- 63kΩ and 40kΩ respectively
Q17 | In the given circuit, find the equivalent resistance between A and B nodes.
- 100kΩ
- 50kΩ
- 40kΩ
- 60kΩ
Q18 | Which of the following acts as a buffer?
- cc amplifier
- ce amplifier
- cb amplifier
- cascaded amplifier
Q19 | Which of the following is true?
- cc amplifier has a large current gain
- ce amplifier has a large current gain
- cb amplifier has low voltage gain
- cc amplifier has low current gain
Q20 | In CB configuration, the value of α=0.98A. A voltage drop of 4.9V is obtained across the resistor of 5KΩ when connected in collector circuit. Find the base current.
- 0.01ma
- 0.07ma
- 0.02ma
- 0.05ma
Q21 | Which of the following is the correct relationship between base and emitter current of a BJT?
- ib = β ie
- ib = ie
- ib = (β + 1) ie
- ie = (β + 1) ib
Q22 | For best operation of a BJT, which region must the operating point be set at?
- active region
- cutoff region
- saturation region
- reverse active region
Q23 | From the given circuit, using a silicon transistor, what is the value of IBQ?
- 47.08 ma
- 47.08 ua
- 50 ua
- 0 ma
Q24 | From the given circuit, using a silicon BJT, what is the value of VCEQ?
- 7 v
- 0.7 v
- 6.83 v
- 7.17 v
Q25 | From the given circuit, using a silicon BJT, what is the value of VBC?
- 6.13 v
- -6.13 v
- 7 v
- -7 v