Electronic Devices And Circuits Set 4
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This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on Electronic Devices And Circuits Set 4
Q1 | At zero signal condition, a transistor sees load.
- dc
- ac
- both dc and ac
- resistive
Q2 | What is the gain of an amplifier with negative feedback if the feedback factor is 0.01?
- 10
- 1000
- 100
- 500
Q3 | The current gain of an emitter follower is
- equal to 1
- greater than 1
- less than 1
- zero
Q4 | The current in any branch of a transistor amplifier that is operating is
- ac only
- the sum of ac and dc
- the difference of ac and dc
- dc only
Q5 | An ideal differential amplifiers common mode rejection ratio is
- infinite
- zero
- unity
- undetermined
Q6 | An open fuse circuit has a resistance equal to
- zero
- unity
- at least 100Ω atstandard
- infinity
Q7 | What is the purpose of dc conditions in a transistor?
- to reverse bias the emitter
- to forward bias the emitter
- to set up operating point
- to turn on the transistor
Q8 | The ac variations at the output side of power supply circuits are called .
- ripples
- pulses
- waves
- filters
Q9 | What is the purpose of the emitter capacitor?
- to forward bias the emitter
- to reduce noise in the amplifier
- to avoid drop in gain
- to stabilize emitter voltage
Q10 | A common emitter circuit is also called circuit.
- grounded emitter
- grounded collector
- grounded base
- emitter follower
Q11 | The output signal of a common-collector amplifier is always
- larger than the input signal
- in phase with the input signal
- out of phase with the input signal
- exactly equal to the input signal
Q12 | Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms
- 5%
- 10%
- 50%
- 6%
Q13 | What is the ideal maximum voltage gain of a common collector amplifier?
- unity
- infinite
- indeterminate
- zero
Q14 | The output power of a transistor amplifier is more than the input power due to additional power supplied by
- transistor
- collector supply
- emitter supply
- base supply
Q15 | When a transistor amplifier feeds a load of low resistance, its voltage gain will be
- low
- very high
- high
- moderate
Q16 | The capacitors are considered in the ac equivalent circuit of a transistor amplifier.
- open
- partially open
- short
- partially short
Q17 | For highest power gain, what configuration is used?
- cc
- cb
- ce
- cs
Q18 | What is the most important characteristic of a common collector amplifier?
- high input voltage
- high input resistance
- high output resistance
- its being an amplifier circuit
Q19 | Which of the item below does not describe a common emitter amplifier?
- high voltage gain
- high current gain
- very high power gain
- high input resistance
Q20 | CC configuration is used for impedance matching because its
- input impedance is very high
- input impedance is very low
- output impedance is very low
- output impedance is zero
Q21 | Which of the following is the other name of the output stage in an amplifier?
- load stage
- audio stage
- power stage
- rf stage
Q22 | When amplifiers are cascaded
- the gain of each amplifier is increased
- a lower supply voltage is required
- the overall gain is increased
- each amplifier has to work less
Q23 | Ina common emitter amplifier, the capacitor from emitter to ground is called the
- coupling capacitor
- bypass capacitor
- decoupling capacitor
- tuning capacitor
Q24 | A class A power amplifier uses transistor(s).
- two
- one
- three
- four
Q25 | What is the maximum collector efficiency of a resistance loaded class A power amplifier?
- 50%
- 78.50%
- 25%
- 30%