Analog Electronics
A full wave rectifier circuit using centre tapped transformer and a bridge rectifier are fed at 100 V, 50 Hz. The frequencies of outputs in these two rectifiers are
Answer: A
Output wave in each case has two cycles for one cycle of input wave.
Enter details here
In a CE amplifier the collector resistance is short circuited. The ac output voltage will
Answer: D
Since the output is taken across collector resistance, short-circuiting collector resistance will decrease output voltage.
Enter details here
An RC oscillator uses
Answer: C
One RC combination can give a phase shift of less them 90°. Therefore 3 RC combinations are required for 180° phase shift.
Enter details here
A potential of 7 V is applied to a silicon diode. A resistance of 1 kΩ is also connected in series. If the diode is forward biased, the current in the circuit is
Answer: B
A = 6.3 mA.
Enter details here
The current flowing in a certain P-N junction at room temperature is 2 x 10-7 Amp. When a large reverse biased voltage is applied. Calculate the current flowing when 0.1 volts is applied.
Answer: A
Enter details here
The main application of enhancement mode MOSFET is in
Answer: C
Because of high switching speed MOSFET is very suitable for digital circuit.
Enter details here
A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that
Answer: B
Since load voltage is zero, the current is zero and diode is open-circuited. If load was open-circuited, load voltage would be about 9 V.
Enter details here
The ideal characteristics of a stabilizer is
Answer: A
A stabilizer must give constant output voltage. This is possible only if internal resistance is low.
Enter details here
Assertion (A): CE amplifier is the most widely used BJT amplifier
Reason (R): CE amplifier has zero phase difference between input and output
Answer: C
There is 180° phase difference between input and output.
Enter details here
A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is
Answer: C
Power rating = 8 - (55 - 25)(30 x 10-3) = 7.1 W.
Enter details here
Topics
- Materials and Components
- Electromagnetic Field Theory
- Networks Analysis and Synthesis
- Measurements and Instrumentation
- Analog Electronics
- Automatic Control Systems
- Radio Receivers
- Satellite Communication
- Signals and Systems
- Exam Questions Papers
- Electronic Devices and Circuits
- Power Electronics
- Digital Electronics
- Communication Systems
- Microwave Communication
- Microprocessors
- Matching Questions