McqMate

Q. |
## Which of the following has a negative temperature coefficient of resistance? |

A. | capacitor |

B. | diode |

C. | thermistor |

D. | sensistor |

Answer» D. sensistor | |

Explanation: the sensistor has a positive temperature coefficient of resistance. it is a temperature sensitive resistor. it is a heavily doped semiconductor. when voltage is decreased, the net forward emitter voltage decreases. as a result the collector current decreases. |

733

0

Do you find this helpful?

1

View all MCQs in

Electronic Circuits 1No comments yet

- Which of the following has a negative temperature coefficient of resistance?
- For the given circuit, input resistance RI = 20Ω, hfe = 50. Output resistance = ∞. Find the new values of input and output resistance, if a base resistance of 2kΩ is added to the circuit.
- 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?
- A transistor has hie =1KΩ and hfe=60 with an bypassed emitter resistor Re=1kΩ. What will be the input resistance and output resistance?
- The diode in a half wave rectifier has a forward resistance RF. The voltage is Vmsinωt and the load resistance is RL. The DC current is given by
- Consider the following circuit, where source current = 10mA, hfe = 50, hie = 1100Ω, then for the transistor circuit, find output resistance RO and input resistance RI.
- Consider a Darlington amplifier. In the self bias network, the biasing resistances are 220kΩ and 400 kΩ. What can be the correct value of input resistance if hfe=50 and emitter resistance = 10kΩ.
- When applying miller’s theorem to resistors, resistance R1 is for node 1 and R2 for node 2. If R1>R2, then for same circuit, then for capacitance for which the theorem is applied, which will be larger, C1 or C2?
- The negative sign in the formula of amplification factor indicates
- The negative polarity is used in the monopolar link because it