I need help with this biopolar junction transistor problems?

Question

1- When a transistor is checked out-of-circuit, a very low resistance reading should be obtained between the C and E leads of a good transistor? True or False
2- A tranistor amplifier has an input voltage of 76mV and an output voltage of 2.48 V. The voltage gain is what?
3- In a NPN transistor the majority carriers in the base are holes or free electron or both?
4-In a bipolar junction transistor, collector current is controlled by a-collector voltage b-base current c- collector resistance or all of them?
5- When a transistor switch is on the collector current is limited by a- the base current b- the colloctor resistance c- the base voltage or d- the base resistance?

Answer 1

1. False -- it should read very high
2. gain = 2.48 / 0.076 (you can do the division on your calculator)
3. holes -- the base of an NPN is 'P' type, which has holes ('P'ositive charges) as the majority carrier.
4. b. base current -- that's a fundamental characteristic of BJTs
5. b. collector resistance -- when a transistor switch is on it is known to be in saturation. The voltage from the collector to emitter is very low (less than 1/2 volt). It doesn't behave like an amplifier, and the only thing limiting the current flowing through it is the internal collector resistance.

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