Get premium membership and access questions with answers, video lessons as well as revision papers.
- An electronic device that generates sinusoidal oscillations of desired frequency is known as a
sinusoidal oscillator.
- Oscillations are produced without any external signal source. The only input power to an oscillator is the d.c. power supply.
- Although we speak of an oscillator as ?generating? a frequency, it should be noted that it does not create energy, but merely acts as an energy converter. It receives d.c. energy and changes it into a.c. energy of desired frequency. The frequency of oscillations depends upon the constants of the device.
- Although an alternator produces sinusoidal oscillations of 50Hz, it cannot be called an oscillator. Firstly, an alternator is a mechanical device having rotating parts whereas an oscillator is a non-rotating electronic device.
- Secondly, an alternator converts mechanical energy into a.c. energy while an oscillator converts d.c. energy into a.c. energy.
- Thirdly, an alternator cannot produce high frequency oscillations whereas an oscillator can produce oscillations ranging from a few Hz to several MHz.
Wilfykil answered the question on August 15, 2019 at 08:55
- Define the term Phase Reversal(Solved)
Define the term Phase Reversal
Date posted: August 15, 2019. Answers (1)
- Select a suitable value for the emitter bypass capacitor in Fig. 5.4 if the amplifier is to operate over a frequency range from 2 kHz...(Solved)
Select a suitable value for the emitter bypass capacitor in Fig. 5.4 if the amplifier is to operate over a frequency range from 2 kHz to 10 kHz.
Date posted: August 15, 2019. Answers (1)
- What is the role of emitter bypass capacitor CE in CE amplifier circuit shown in Fig. 5.3 ? Illustrate with a numerical example.(Solved)
What is the role of emitter bypass capacitor CE in CE amplifier circuit shown in Fig. 5.3 ? Illustrate with a numerical example.
Date posted: August 15, 2019. Answers (1)
- Show and explain a Practical Circuit of Transistor Amplifier(Solved)
Show and explain a Practical Circuit of Transistor Amplifier
Date posted: August 15, 2019. Answers (1)
- Define Single Stage Transistor Amplifier and explain how it works(Solved)
Define Single Stage Transistor Amplifier and explain how it works
Date posted: August 15, 2019. Answers (1)
- For a single stage transistor amplifier, the collector load is RC = 2 kilo-ohms and the input resistance Ri = 1 kilo-ohm. If the current...(Solved)
For a single stage transistor amplifier, the collector load is RC = 2 kilo-ohms and the input resistance Ri = 1 kilo-ohm. If the current gain is 50, calculate the voltage gain of the amplifier.
Date posted: August 15, 2019. Answers (1)
- If the collector current changes from 2 mA to 3mA in a transistor when collector- emitter voltage is increased from 2V to 10V, what is...(Solved)
If the collector current changes from 2 mA to 3mA in a transistor when collector- emitter voltage is increased from 2V to 10V, what is the output resistance?
Date posted: August 15, 2019. Answers (1)
- A change of 200 mV in base-emitter voltage causes a change of 100 µA in the base current. Find the input resistance of the transistor.(Solved)
A change of 200 mV in base-emitter voltage causes a change of 100 μA in the base current. Find the input resistance of the transistor.
Date posted: August 15, 2019. Answers (1)
- What does the performance of a transistor amplifier depend upon?(Solved)
What does the performance of a transistor amplifier depend upon?
Date posted: August 15, 2019. Answers (1)
- What is the Output from Transistor Amplifier?(Solved)
What is the Output from Transistor Amplifier?
Date posted: August 15, 2019. Answers (1)
- Determine the Q point of the transistor circuit shown in Fig. 4.40. Also draw the d.c. load line. Given ß = 200 and VBE =...(Solved)
Determine the Q point of the transistor circuit shown in Fig. 4.40. Also draw the d.c. load line. Given β = 200 and VBE = 0.7V.
Date posted: August 15, 2019. Answers (1)
- In the circuit diagram shown in Fig. 4.39 (i), if VCC = 12V and RC = 6 kilo-ohms, draw the d.c. load line.(Solved)
In the circuit diagram shown in Fig. 4.39 (i), if VCC = 12V and RC = 6 kilo-ohms, draw the d.c. load line. What will be the Q point if zero signal base current is 20μA and β = 50?
Date posted: August 15, 2019. Answers (1)
- For the circuit shown in Fig. 4.38 (i), draw the d.c. load line.(Solved)
For the circuit shown in Fig. 4.38 (i), draw the d.c. load line.
Date posted: August 15, 2019. Answers (1)
- Explain Transistor Load Line Analysis(Solved)
Explain Transistor Load Line Analysis
Date posted: August 15, 2019. Answers (1)
- Explain Transistor as an Amplifier in CE Arrangement(Solved)
Explain Transistor as an Amplifier in CE Arrangement
Date posted: August 15, 2019. Answers (1)
- Which are the Commonly Used Transistor Connection?(Solved)
Which are the Commonly Used Transistor Connection?
Date posted: August 15, 2019. Answers (1)
- Show the Comparison of Transistor Connections(Solved)
Show the Comparison of Transistor Connections
Date posted: August 15, 2019. Answers (1)
- Fig. 4.28 shows the short circuit failures in a transistor. What will be the circuit behaviour in each case ?(Solved)
Fig. 4.28 shows the short circuit failures in a transistor. What will be the circuit behaviour in each case ?
Date posted: August 14, 2019. Answers (1)
- Fig. 4.27 shows the open circuit failures in a transistor. What will be the circuit behaviour in each case ?(Solved)
Fig. 4.27 shows the open circuit failures in a transistor. What will be the circuit behaviour in each case ?
Date posted: August 14, 2019. Answers (1)
- A transistor has the following ratings: IC (max) = 500 mA and ßmax = 300.(Solved)
A transistor has the following ratings: IC (max) = 500 mA and ßmax = 300. Determine the maximum allowable value of IB for the device.
Date posted: August 14, 2019. Answers (1)