Multiple Choice Questions for Electronics Engineering Part 3
Glide to success with Doorsteptutor material for competitive exams : get questions, notes, tests, video lectures and more- for all subjects of your exam.
Q.36 In a bridge rectifier
- PIV has a value Vm
- Centre tap of secondary is not required
- Smaller transformer can be used
- All
Answer: 4
Q.37 In an R-2R ladder D⟋A converter, the input resistance is
- Not same for all digital inputs
- R for each input
- 2R for each input
- 3R for each input
Answer: 4
Q.38 The speed of a D. C. motor can be controlled by varying
- Its flux per pole
- Resistance of armature circuit
- Applied voltage
- All of the above
Answer: 4
Q.39 The chief advantage of Ward-Leonard system D. C motor speed control is that is
- Can be used even for small motors
- has high overall efficiency at all speeds
- Gives smooth, sensitive and wide speed control
- Uses a flywheel to reduce fluctuations in power demand
Answer: 3
Q.40 A transformer transforms
- Frequency
- Voltage
- Current
- Voltage and current
Answer: 4
Q.41 Which of the following is not a basic element of a transformer?
- Core
- Primary winding
- Secondary winding
- Mutual flux
Answer: 4
Q.42 The slight curvature at the lower end of the O. C. C. of a self-excited dc generator is due to
- residual pole flux
- high armature speed
- magnetic inertia
- high field circuit resistan
Answer: 3
Q.43 for the voltage built-up a self-excited D. C. generator, which of the following is not an essential condition.
- there must be some residual flux
- field winding mmf must aid the residual flux
- total field circuit resistance must be less than t critical value
- armature speed must be very high
Answer: 4
Q.44 The Intel 8212 is an - non programmable I⟋O port
- 4 – bit
- 8 – bit
- 16 – bit
- 32 – bit
Answer: 2
Q.45 The terms՚soft sectored and hard sectored are used in connection with
- µP
- RAM
- ROM
- Floppy disk
Answer: 4
Q.46 In temperature monitoring system – transducers are used
- 2
- 3
- 4
- 6
Answer: 1
Q.47 Today most computers use-technology for their operation
- Germanium
- Silicon
- Gallium – Arsenide
- Gallium – telluride
Answer: 2
Q.48 In a multivibrator
- Feedback between two stages is 100%
- Positive feedback is employed
- When one transistor is on, the other is off
- All
Answer: 4
Q.49 An OP-AMP can be classified as
- Linear amplifier
- Low – Rin amplifier
- Positive – feedback amplifier
- RC – coupled amplifier
Answer: 2
Q.50 Amplification factor of a circuit is 50. For oscillator is feedback factor should be
- 50
- 100
Answer: 3
Q.51 positive feedback is used in
- Amplifier
- Rectifier
- Oscillator
- Detector
Answer: 3
Q.52 Darlington pair
- is a three terminal device with very high current gain
- has a very high input impedance
- has a very low output
- all the above are true
Answer: 4
Q.53 Which of the following has got a positive susceptibility
- Diamagnetic
- Paramagnetic
- Ferromagnetic
- both paramagnetic & ferromagnetic
Answer: 4