Electronic Circuits I Set 1

On This Page

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