Home
Class 12
PHYSICS
What is the current gain for a transisto...

What is the current gain for a transistor used as a common emitter amplifier, if the current gain of the same transistor used in common base mode is 0.95 ?

A

25

B

49

C

19

D

15

Text Solution

Verified by Experts

The correct Answer is:
C

`alpha=0.95 therefore beta=alpha/(1-alpha)=0.95/0.05 `=19
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 3|8 Videos
  • STATIONARY WAVES

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP-8|20 Videos

Similar Questions

Explore conceptually related problems

If a transistor is used in common -emitter mode as an amplifier,then

The current gain for a common emitter amplifier is 69. If the emitter current is 7 mA, the base current is

A transistor is used in the common emitter mode as an amplifier . Then

The current gain of a transistor in a common emitter circuit is 40.The ratio of emitter current to base current is

The current gain for transistor working as a common base amplifier is 0.96.If the emitter current is 7.2mA, then the base current is

The current gain for a transistor working as a common-base amplifier is 0.96 . If the emitter current is 7.2 mA , the base current will be

The current amplificationn factor for a transistor in its common emitter mode is 50. the current amplication factor in the common base mode of the transistor is

For a transistor, in a common emitter arragement, the alternating current gain beta is given by

MARVEL PUBLICATION-SEMICONDUCTORS -MCQs
  1. When a transistor is operated in the active region, it cannot be used

    Text Solution

    |

  2. For a transistor 1/alpha -1/beta is equal to

    Text Solution

    |

  3. What is the current gain for a transistor used as a common emitter amp...

    Text Solution

    |

  4. The difference in the working of a step up transformer and an amplifie...

    Text Solution

    |

  5. In an oscillator, for sustained oscillations, Barkhausen criterion is ...

    Text Solution

    |

  6. To obtain the current gain (beta) of a transistor, when it is in CE mo...

    Text Solution

    |

  7. The r.m.s. value of the base current ofa transistor is 10muA. What is ...

    Text Solution

    |

  8. When a transistor amplifier having current gain of 75 is given an inpu...

    Text Solution

    |

  9. The input signal given to a CE amplifier having a voltage gain of 150 ...

    Text Solution

    |

  10. For a common emitter amplifier, the voltage gain is 40. Its input and ...

    Text Solution

    |

  11. In a common-base amplifier, the phase difference between the input sig...

    Text Solution

    |

  12. A transistor connected in CE mode , has a current gain of 50. If the l...

    Text Solution

    |

  13. In a common base mode of transistor, collector current is 5.488 mA for...

    Text Solution

    |

  14. Three amplifier circuit are connected in series. The voltage gain of e...

    Text Solution

    |

  15. The current gain of a transistor in common base mode is 0.99. What is ...

    Text Solution

    |

  16. When a transistor amplifier having current gain of 75 is given an inpu...

    Text Solution

    |

  17. For a common emitter amplifier, input resistance (Ri) = 500Omega and l...

    Text Solution

    |

  18. In an NPN transistor the collector current is 24 mA. If 80% of electro...

    Text Solution

    |

  19. In a positive feedback oscillator, the feedback voltage (signal) and t...

    Text Solution

    |

  20. A transistor -oscillator using a resonant circuit with an inductor L (...

    Text Solution

    |