AP ECET Electronics and Communication Engineering Paper 2019
| Sr. No. | Question |
| 1 | Holes in an n-type semiconductor are
(a) Minority carriers that are produced by doping (b) Majority carriers that are produced by doping (c) Minority carriers that are thermally produced (d) Majority carriers that are thermally produced |
| 2 | A silicon diode is in series with 1.0 k Ohm resistor and a 5 V battery. If the anode is connected to the positive battery terminal, the cathode voltage with respect to the negative battery terminal is
(a) 0.7 V (b) 0.3 V (c) 5.7 V (d) 4.3 V |
| 3 | If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage
(a) Decrease (b) Increase (c) Remains the same (d) Frequency changes |
| 4 | For operation as an amplifier, the base of a npn transistor must be
(a) Negative with respect to emitter (b) Positive with respect to emitter (c) Short circuited (d) Left floating |
| 5 | Ideally, the equivalent circuit of a FET contains
(a) A current source in series with a resistance (b) A current source between gate and source terminals (c) A current source between drain and source terminals (d) A resistance between drain and source terminals |
| 6 | When the voltage gain of an amplifier is increased , the bandwidth
(a) Remains the same (b) Increase exponentially (c) Increases linearly (d) decreases |
| 7 | The high-frequency response of an amplifier is determined in part by
(a) The internal transistor capacitances (b) Roll off (c) Gain band width product (d) Bypass capacitances |
| 8 | Least distortion in the output of a power amplifier occurs in
(a) Class B Amplifier (b) Class C Amplifier (c) Class AB Amplifier (d) Class A Amplifier |
| 9 | Negative feedback
(a) Increase both input impedance and bandwidth (b) Decrease both input impedance and bandwidth (c) Doesn’t affect input impedance and bandwidth (d) Increase both input and output impedances |
| 10 | Hall effect is observed in a material when it is carrying a current and placed in a magnetic field. The resultant electric field inside the material is
(a) Parallel to the magnetic field (b) Normal to both the current direction and the magnetic field (c) In the direction of the current (d) In a random direction |
| 11 | The operation of a relaxation oscillator is based on
(a) The charging and discharging of a capacitor (b) A stable supply voltage (c) Gradual relaxation of the input (d) Reverse feedback |
| 12 | The output voltage of a CB amplifier is
(a) 180 degree out of the phase with input (b) 90 degree out of the phase with input (c) Same phase as that of the input (d) 270 degree out of the phase with input |
| 13 | A certain inverting amplifier has a closed-loop gain of 25. The op-amp has an open-loop gain of 100,000. If another op-amp with an open loop gain of 200,000 is substituted in the configuration, the closed-loop gain
(a) Doubles to 50 (b) Is halved to 12.5 (c) Increases by a factor of 100000 (d) Remains the same at 25 |
| 14 | Barkhausen stability criterion are applicable to
(a) Linear circuits without feedback (b) Linear circuits with feedback (c) Non linear circuits (d) Unstable circuits |
| 15 | Which of the following circuits works like a flipflop?\
(a) Schmitt Trigger (b) Monostable multivibrator (c) Bistable multivibrator (d) Astable multivibrator |
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