Test: Applications of Transistors
10 Questions MCQ Test Physics Class 12 | Test: Applications of Transistors
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Which of the following is not an ac parameter of a transistor?
Input resistance, Output resistance and Current amplification factor are ac parameters of a transistor.
What is the voltage gain in a common emitter, where input resistance is 3Ω and the load resistance is 24Ω, β = 0.6
Voltage gain =β× (Rc/Rb)
Or, Voltage gain =0.6×(24/3)=4.8
An oscillator is an electronic circuit that converts DC from a power supply to an AC signal. An oscillator produces a periodic and oscillating signal. An oscillator is like an amplifier that gives positive feedback to the circuit. Positive feedback means that a portion of output is combined in phase with the input.
The output characteristic for a common emitter transistor is shown in the given figure.
Use the graph to find out the current amplification factor for the transistor when VCE = 2 V.
The power amplification for a common emitter (CE) amplifier is 22110. Its current gain is 67 and internal resistance is 200 ohm. What is the value of the of the output resistance?
A common emitter (CE) amplifier has a current gain of 49. The voltage drop across the collector terminal is 1.8 V. The collector resistance is 2.2 kilo-ohm. What is the base current in the CE amplifier?
Given,
Current gain(B)=4g
Voltage drop across terminal
Collector=1.8v
Collector resistance=2.2kΩ
Collector current=1.8/2.2x103
Current gain=△IC/△IB
△IB=1.8/2.2x103x4g
(D)△IB=1.67x10-5 A
Which of the following relations correctly shows the value of current amplification factor at a constant collector-emitter voltage?
Transistors are useful in equipments such as hearing aids and small radio receivers because transistors :
Transistors consume very less energy and are therefore used in these equipment because these equipment don't have space for big power source.
The input voltage applied to a cascaded amplifier (consisting of two amplifiers) is 0.02 V and the output voltage is 6 V. The voltage gain of one of the two amplifiers is 10. What is the voltage gain of the other amplifier?
In a common base transistor circuit, the current gain is 0.98. On changing emitter current by 5 mA, the change in collector current is
Given, That the current gain is 0.98
The change in emitter current is Ie=5mA
Therefore, the change in collector current is Ic=0.98×Ie=0.98×5=4.9mA
Therefore, the correct option is C.
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