Analog Electronics Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Analog Electronics Mcqs“. Tab this page to check “Latest Analog Electronics Mcqs “ for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Analog Electronics in past papers. Past papers of Analog Electronics Mcqs. Past papers of Analog Electronics Mcqs. Mcqs are the necessary part of any competitive / job related exams. The Analog Electronics Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Analog Electronics Mcqs. The Important series of Analog Electronics Mcqs are given below:
Which of the following is not associated with a p-n junction?
A. depletion capacitance
B. charge storage capacitance
C. junction capacitance
D. channel length modulation
Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
A. the mobility decreases
B. the drain current increases
C. the transconductance increases
D. none of the above
A change in the value of the emitter resistance Re in a differential amplifier?
A. affects both Ad and Ac
B. affects the common mode gain Ac
C. affects the difference mode gain Ad
D. does not effect either Ad and Ac
In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
A. the edge of the depletion region on the n-side
B. the edge of the depletion region on the p-side
C. the p-n junction
D. the center of the depletion region on the n-side
A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
A. 1.4v
B. 2v
C. 1 v
D. 2.8v
The bandwidth of an RF tuned amplifier is dependent on____________?
A. Q –factor of the tuned o/p circuit
B. Quiescent operating point
C. Q –factor of the tuned i/p circuit
D. Q-factor of the o/p and i/p circuits as well as quiescent operating point
Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
A. input voltage dependent linear transfer characteristic
B. high input resistance
C. high voltage gain
D. high CMRR
A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
A. 5 Ω & 16.7 %
B. 25 Ω & 20 %
C. 5 Ω & 20 %
D. 25 Ω & 16.7 %
A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?
A. 1000/17 KHz
B. 100KHz
C. 50 KHz
D. 1000/7.07 KHz
In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
A. 25dB
B. 23dB
C. 46dB
D. 50dB
An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
A. 1/11KΩ
B. 5KΩ
C. 1/5KΩ
D. 11KΩ
An ideal OP-AMP is an ideal___________?
A. Voltage controlled voltage source
B. Current controlled voltage source
C. Current controlled Current source
D. voltage controlled current source
The current gain of a BJT is__________?
A. gm / r0
B. gm r0
C. gm rπ
D. gm /rπ
To prevent a DC return between source and load, it is necessary to use___________?
A. inductor between source and load
B. resistor between source and load
C. capacitor between source and load
D. either A. or B.
Voltage Series feedback also called series-shunt feedback) results in__________?
A. Decreases in both input & output impedances
B. Increase in both input & output impedances
C. Increase in input impedance & decreases in output impedance
D. Decrease in input impedance & increase in output impedance
In a transistor leakage current mainly depends on__________?
A. size of emitter
B. doping of base
C. rating of transistor
D. temperature
When a transistor is connected in common emitter mode, it with have__________?
A. high input resistance and low output resistance
B. negligible input resistance and high output resistance
C. medium input resistance and high output resistance
D. low input resistance as well as output resistance
In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
A. all transistors
B. all resistors
C. all inductors
D. all capacitors
In an op-amp differentiator:________________?
A. the amplitude of output is proportional to rate of change of input
B. output occurs when input is finite and constant
C. the amplitude of output is proportional to input
D. polarity of input and output is the same
The early effect in a bipolar junction transistor is caused by_______________?
A. fast turn-off
B. fast turn-on
C. large collector-base reverse bias
D. large emitter-base forward bias
A source follower using an FET usually has a voltage gain which is___________?
A. greater than +100
B. exactly unity but negative
C. slightly less than unity but positive
D. about -10
An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.
A. 5 volts
B. 10 volts
C. 5/1 volts
D. 5/2 volts
A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
A. Bandwidth
B. CMMR
C. Slew rate
D. Open-loop gain
The effective channel length of a MOSFET in a saturation decreases with increase in___________?
A. Source voltage
B. Drain voltage
C. Gate voltage
D. Body voltage
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
A. 0.75
B. 0.5
C. 0.25
D. 1
Class AB operation is often used in power large signal amplifiers in order to_________?
A. remove even harmonics
B. get maximum efficiency
C. overcome a crossover distortion
D. reducing collector dissipation
Negative feedback in an amplifier____________?
A. Reduces gain
B. Increase frequency &phase distortion
C. Increases noise
D. Reduces bandwidth
The current gain of a bipolar transistor drops at high frequencies because of____________?
A. Transistor capacitances
B. Parasitic inductive elements
C. High current effects in the base
D. The early effect
Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
A. Internal Capacitance of the device
B. Skin effect
C. Coupling capacitor at the input
D. Coupling capacitor at the output
The action of JFET in its equivalent circuit can best be represented as a_____________?
A. Current controlled voltage source
B. Current controlled Current source
C. Voltage controlled voltage source
D. voltage controlled current source
In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
A. Vdc = 2Vm/π, PIV=Vm
B. Vdc = 2Vm/π, PIV=2vm
C. Vdc = Vm/π, PIV=2Vm
D. Vdc = Vm/π, PIV=Vm
The most commonly used amplifier in sample & hold circuits is______________?
A. An inverting amplifier with a gain of 10
B. A unity gain inverting amplifier
C. A unity gain non-inverting amplifier
D. An inverting amplifiers with a gain of 100
Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
A. only the β of the transistor
B. Only the temperature
C. Both Temperature & β
D. None of the above
In a CB amplifier the maximum efficiency could be____________?
A. 85%
B. 99%
C. 50%
D. 25%
The horizontal intercept of dc load line is the same as ideal____________?
A. cut off point
B. operating point
C. saturation point
D. quasi saturation point
Which of the following amplifier circuit using junction transistor has the best gain?
A. Common collector
B. Common emitter
C. Common base
D. All have the same gain
MOSFET can be used as a__________?
A. current controlled inductor
B. voltage controlled capacitor
C. current controlled capacitor
D. voltage controlled inductors
A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
A. 2
B. 0
C. 1/2
D. 1
In a common emitter, unbypassed resister provides___________?
A. current series feedback
B. voltage shunt feedback
C. negative voltage feedback
D. positive current feedback
. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?
A. 3.2mA
B. 2.3mA
C. 4.6 mA
D. 5.2mA
The MOSFET switch in its on-state may be considered equivalent to_____________?
A. inductor
B. resistor
C. capacitor
D. battery
An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?
A. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
C. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
A. 395mV
B. 795mV
C. 795 mV
D. 39.5mV
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
A. 51dB
B. 49dB
C. 98dB
D. 102dB
The cascade amplifier is a multistage configuration of__________?
A. CB-CC
B. CE-CB
C. CC-CB
D. CE-CC
The encapsulation of transistor is necessary for__________?
A. preventing photo-emission effects
B. preventing radio interference
C. avoiding loss of free electrons
D. mechanical ruggedness
In all base driver amplifiers__________?
A. ac collector voltage is 180° out of phase with ac base voltage
B. ac collector voltage is in phase with ac base voltage
C. ac emitter voltage is 180° out of phase with ac base voltage
D. none of the above