Electronic Devices And Circuits Set 5
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This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on Electronic Devices And Circuits Set 5
Q1 | What is the maximum collector efficiency of a transformer coupled class A power amplifier?
- 30%
- 80%
- 45%
- 50%
Q2 | Class C amplifiers are used as
- af amplifiers
- small signal amplifiers
- rf amplifiers
- if amplifiers
Q3 | Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150uA.
- 150 µv
- 150 mv
- 150 v
- 200 mv
Q4 | If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
- increases
- decreases
- becomes erratic
- remains the same
Q5 | Comparatively, power amplifier has β.
- large
- very large
- small
- very small
Q6 | The driver stage usually employs amplifier.
- class a power
- class c
- push-pull
- class ab
Q7 | The push-pull circuit must use operation.
- class a
- class b
- class c
- class ab
Q8 | A complementary-symmetry amplifier has
- one pnp and one npn transistor
- two pnp transistors
- two npn transistors
- two pnp and two npn transistors
Q9 | Power amplifiers generally use transformer coupling because transformer coupling provides
- cooling of the circuit
- distortionless output
- impedance matching
- good frequency response
Q10 | The output transformer used in a power amplifier is a/an transformer
- 1:1 ratio
- step-down
- step-up
- isolation
Q11 | An emitter follower has a voltage gain that is
- much less than one
- approximately equal to one
- greater than one
- zero
Q12 | The input impedance of the base of an emitter follower is usually
- low
- high
- shorted to ground
- open
Q13 | The ac base voltage of an emitter follower is across the
- emitter diode
- dc emitter resistor
- load resistor
- emitter diode and external ac emitter resistance
Q14 | The output voltage of an emitter follower is across the
- emitter diode
- dc collector resistor
- load resistor
- emitter diode and external ac emitter resistance
Q15 | The differential amplifier has
- one input and one output
- two inputs and two outputs
- two inputs and one output
- one input and two outputs
Q16 | The differential amplifier produces outputs that are
- common mode
- in-phase with the input voltages
- the sum of the two input voltages
- the difference of the two input voltages
Q17 | Which factor does not affect CMOS loading?
- charging time associated with the output resistance of the driving gate
- discharging time associated with the output resistance of the driving gate
- output capacitance of the load gates
- input capacitance of the load gates
Q18 | Which transistor element is used in CMOS logic?
- fet
- mosfet
- bipolar
- unijunction
Q19 | A Darlington pair is used for
- low distortion
- high frequency range
- high power gain
- high current gain
Q20 | What is the effect of cascading amplifier stages?
- increase in the voltage gain and increase in the bandwidth
- increase in the voltage gain and reduction in the bandwidth
- decrease in the voltage gain and increase in the bandwidth
- increase in the voltage gain and reduction in the bandwidth
Q21 | An open-drain gate is the CMOS counterpart of .
- an open-collector ttl gate
- a tristate ttl gate
- a bipolar junction transistor
- an emitter- coupled logic gate
Q22 | The decibel gain of a cascaded amplifier equals to
- product of individual gains
- sum of individual gains
- ration of stage gains
- product of voltage and current gains
Q23 | The most desirable feature of transformer coupling is its
- higher voltage gain
- wide frequency range
- ability to provide impedance matching between stages
- ability to eliminate hum from the output
Q24 | A transformer coupled amplifier would give
- maximum voltage gain
- impedance matching
- maximum current gain
- larger bandwidth
Q25 | One of the advantages of a Darlington pair is that it has enormous transformation capacity.
- voltage
- current
- impedance
- power