Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : If two charges are increased by two times then force_____________?

A: Decreases 9 times B: Increases 9 times C: Increases 4 times D: Decreases 4 times

Q2 : Electric intensity being a vector quantity always points_______________?

A: along the direction of force experienced by a unit positive charge B: opposite to the direction of force experienced by a unit positive charge C: perpendicular to the direction of force experienced by a uit positive charge D: any of above

Q3 : In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?

A: is 7 kHz B: is 10 kHz C: is 12 kHz D: cannot be determined

Q4 : The purpose of d.c. conditions in a transistor is to___________________?

A: Reverse bias the emitter B: Forward bias the collector C: Set up operating point D: None of the above

Q5 : The ear is not sensitive to___________?

A: Frequency distortion B: Amplitude distortion C: Frequency as well as amplitude distortion D: None of the above

Q6 : If free space between the plates of a capacitor is replaced by a dielectric_____________?

A: The potential difference remains constant capacittance and energy stored increases B: The potential difference remains constant capacittance decreases and energy increases C: The potential difference decreases but both capacitance and energy increase D: both potential difference and capacitance decrease but energy increases

Q7 : A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?

A: 200J B: 100J C: 1000J D: 100 eV

Q8 : The universal gate is ________________?

A: NAND gate B: OR gate C: AND gate D: None of the above

Q9 : A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are___________?

A: 2 V, 4 V B: 2 V, 2 V C: 2 V, 6 V D: 4 V, 6 V

Q10 : Digital computers are more widely used as compared to analog computers, because they are______________?

A: less expensive B: always more accurate and faster C: useful over wider ranges of problem types D: easier to maintain

Q11 : A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?

A: 10.9 V B: 1.09 V C: 1.1 V D: 12 V

Q12 : In a certain five-step R/2R ladder network, the smallest resistor value is 1 kΩ. The largest value is___________?

A: Indeterminable B: 2 kΩ C: 10 kΩ D: 20 kΩ

Q13 : The driver stage usually employs_________________?

A: Class A power amplifier B: Push-pull amplifier C: Class C amplifier D: None of the above

Q14 : Potential difference is the work done in moving unit positive charge form one point to another________________?

A: in the direction of electric intensity B: against electric intensity C: in any direction D: in the direction of electric flux

Q15 : In Boolean algebra, the bar sign (-) indicates__________________?

A: OR operation B: AND operation C: NOT operation D: None of the above

Q16 : The maximum efficiency of transformer coupled class A power amplifier is _______________?

A: 30% B: 50% C: 80% D: 45%

Q17 : A radio receiver has____________of amplification?

A: One stage B: Two stages C: Three stages D: More than one stages

Q18 : The output transformer used in a power amplifier is a _____________ transformer?

A: 1:1 ratio B: Step-up C: Step-down D: None of the above

Q19 : A current amplification of 2000 is a gain of_________________?

A: 3 db B: 66 db C: 20 db D: 200 db

Q20 : NAND gates are preferred over others because these__________________?

A: have lower fabrication area B: can be used to make any gate C: consume least electronic power D: provide maximum density in a chip

Q21 : A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is____________?

A: 18 V peak-to-peak B: zero C: 9 V peak-to-peak D: 12.74 V peak-to-peak

Q22 : The most costly coupling is _______________ coupling?

A: RC B: Direct C: Impedance D: Transformer

Q23 : A.C cannot be used for________________?

A: producing heat B: producing light C: magnetizing and electroplating D: all the above

Q24 : CC configuration is used for impedance matching because its ________________?

A: Input impedance is very high B: Input impedance is low C: Output impedance is very low D: None of the above

Q25 : Power amplifiers generally use transformer coupling because transformer permits______________?

A: Cooling of the circuit B: Impedance matching C: Distortionless output D: Good frequency response

Q26 : Transformer coupling can be used in______________amplifiers?

A: Either power or voltage B: Only power C: Only voltage D: None of the above

Q27 : An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?

A: 81 µF B: 161 µF C: 0.161 µF D: 220 µF

Q28 : The force per unit charge is know as__________________?

A: electric flux B: electric intensity C: electric potential D: all of above are same

Q29 : Low efficiency of a power amplifier results in_________________?

A: Low forward bias B: Less battery consumption C: More battery consumption D: None of the above

Q30 : When we rub a glass rod with a silk cloth then________________?

A: glass rod acquires negative charge while silk acquires positive charge B: glass rod acquires positive charge while silk acquires negative charges C: both glass rod and silk acquire negative charge D: both glass rod and silk acquire negative charge

Q31 : In a non-uniform electric field a polar molecule will experience____________?

A: Net torque B: Net force C: both series and parallel combinations D: zero

Q32 : The electric lines of force are____________?

A: imaginary B: physically existing every where C: physically existing near the charges D: depends upon case

Q33 : An AF amplifier is shielded to ________________?

A: Keep the amplifier cool B: Protect from rusting C: Prevent induction due to stray magnetic fields D: None of the above

Q34 : Magnetic compass needle will be deflecting if it is kept near________________?

A: Static charge B: Soft iron C: Semi-conductor D: Accelerating charge

Q35 : capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?

A: 4 volts B: 9 volts C: 2 volts D: 1 vol

Q36 : In RC coupling, the value of coupling capacitor is about_______________?

A: 100 pF B: 0.1 µF C: 0.01 µF D: 10 µF

Q37 : Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?

A: TTLAS B: CMOS C: ECL D: TTLLS

Q38 : Which instrument is used to measure the power of electric circuit ?

A: Wavemeter B: Viscometer C: Wattmeter D: None of these

Q39 : The inverter is _________________?

A: NOT gate B: OR gate C: AND gate D: .None of the above

Q40 : The number of stages that can be directly coupled is limited because___________?

A: Changes in temperature cause thermal instability B: Circuit becomes heavy and costly C: It becomes difficult to bias the circuit D: None of the above

Q41 : In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?

A: Short B: Open C: Partially open D: None of the above

Q42 : A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is____________?

A: 680 Ω B: 1,029 Ω C: 200 Ω D: 880 Ω

Q43 : What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?

A: 2 B: 7 C: 3 D: 7

Q44 : The number of electrons in one coulomb charge is equal to_______________?

A: 6.2 x 1018 B: 1.6 x 1019 C: 6.2 x 1021 D: 1.6 x 10-27

Q45 : The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?

A: 3-Jan B: 3 C: 1 D: 6

Q46 : If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?

A: 20 kΩ B: 2 kΩ C: 10 kΩ D: 5 kΩ

Q47 : The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?

A: 1Hzs B: 1.5Hzs C: 106sec D: 1sec

Q48 : Non inductive resistances are used in decreasing______________?

A: Mutual inductance B: Self inductance C: Magnetic fields D: Heating effect

Q49 : RC coupling is generally confined to low power applications because of____________?

A: Large value of coupling capacitor B: Low efficiency C: Large number of components D: None of the above

Q50 : The parallel combination of a 470 Ω resistor and a 1.5 kΩ resistor is in series with the parallel combination of five 1 kΩ resistors. The source voltage is 50 V. The percentage of the load current through any single 1 KΩ resistor is__________?

A: 25 % B: 20 % C: 100 % D: 50 %

Q51 : The pulsating d.c. applied to power amplifier causes________________?

A: Burning of transistor B: Hum in the circuit C: Excessive forward voltage D: None of the above

Q52 : capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?

A: 4 volts B: 9 volts C: 2 volts D: 1 vol

Q53 : An RC high-pass filter consists of a 0.2 µF capacitor and a 220 Ω resistor. The output is taken across the resistor. The circuit’s critical frequency is_____________?

A: 723 Hz B: 7,234 Hz C: 362 Hz D: 3,617 Hz

Q54 : The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?

A: 20 W B: 40 W C: 10 W D: 80 W

Q55 : If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?

A: 1V B: 100V C: 20V D: 10V

Q56 : The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?

A: The same as B: Less than C: More than D: None of the above

Q57 : Value of εr for various dielectrics is always________________?

A: Less than unity B: Equal to the unit C: Larger than unit D: . No hard and fast rule

Q58 : Current produced by moving the loop of wire across a magnetic field is called_____________?

A: A.C current B: D.C current C: induced current D: mean square current

Q59 : Which one of the following functions like a motor ?

A: galvanometer B: ammeter C: voltmeter D: all of above

Q60 : Electric flux due to a point charge +q is______________?

A: 1/4IIɛ q/r B: q/ɛ0 C: 1/4IIɛ0. q/r2 D: 4IIɛ0

Q61 : In a series resonant band-pass filter, a lower value of Q results in______________?

A: a higher impedance B: a smaller bandwidth C: a higher resonant frequency D: a larger bandwidth

Q62 : In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?

A: Changes abruptly with frequency B: Is constant C: Changes uniformly with frequency D: None of the above

Q63 : A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?

A: A torque about horizontal axis B: A torque about vertical axis C: An upward force along the axis D: No resultant force

Q64 : The disadvantage of impedance matching is that it _______________?

A: Gives distorted output B: Gives low power output C: Requires a transformer D: None of the above

Q65 : A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?

A: negative B: positive C: zero D: data is insufficient

Q66 : A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?

A: ωB/r22-r12/Δt B: ωB(r2-r1)2/Δt C: ωB(r22-r12)/Δt D: ωB(r22+r12)/Δt

Q67 : The best frequency response is of_____________coupling?

A: RC B: Transformer C: Direct D: None of the above

Q68 : If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?

A: cannot tell B: remains the same C: increases D: decreases

Q69 : The fan put of a 7400 NAND gate is_______________?

A: 2TTL B: 5TTL C: 8TTL D: 10TTL

Q70 : In case of OR gate, no matter what the number of inputs, a____________________?

A: 1 at any input causes the output to be at logic 1 B: 1 at any input causes the output to be at logic 0 C: 0 any input causes the output to be at logic 0 D: 0 at any input causes the output to be at logic 1

Q71 : Transformer works on the principle of________________?

A: Lenzs law B: Faradays law C: Mutual induction D: Law of conservation of power

Q72 : The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________?

A: Limit the maximum emitter current B: Provide base-emitter bias C: Limit the change in emitter current D: None of the above

Q73 : The maximum collector efficiency of class B operation is ________________?

A: 50% B: 90% C: 5% D: 5%

Q74 : A CE amplifier is also called _______________ circuit?

A: Grounded emitter B: Grounded base C: Grounded collector D: None of the above

Q75 : The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?

A: 1000 B: A million C: 100 D: 10000

Q76 : For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?

A: 10 W B: 4 W C: 8 W D: None of the above

Q77 : For electroplating we use_________________?

A: A D.C source B: an A.C source C: any source D: all of the above

Q78 : When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?

A: c. load line B: c. load line C: both d.c. and a.c. load lines D: none of the above

Q79 : For highest power gain, one would use _________________configuration?

A: CC B: CB C: CE D: none of the above

Q80 : An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?

A: Induced curren B: Eddy current C: Back emf D: None of the above

Q81 : In obtaining the frequency response curve of an amplifier, the______________?

A: Amplifier level output is kept constant B: Amplifier frequency is held constant C: Generator frequency is held constant D: Generator output level is held constant

Q82 : Photocopier and inject printer are dealt in________________?

A: Electrostatics B: Charges in motion C: Capacitors D: Electric fields

Q83 : Class_____________ power amplifier has the highest collector efficiency ?

A: C B: A C: B D: AB

Q84 : The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?

A: 1 W B: 2 W C: 4 W D: None of the above

Q85 : When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?

A: RC B: Transformer C: Direct D: None of the above

Q86 : Power loss in actual transformer is due to_________________?

A: Small output B: Eddy currents and magnetic hysterias C: Soft iron core D: Back emf

Q87 : Equipotential planes are_______________?

A: parallel to one another B: non parallel to one another C: intersecting D: circular

Q88 : cmf generated by A.C dynamo depends upon_____________?

A: number of turns in the coil B: magnetic field strength C: frequency of rotation D: all of above

Q89 : A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately___________?

A: 14 mA B: 1.4 mA C: 5 mA D: 50 mA

Q90 : The emf induced in a coil by a changing magnetic flux may have unit as______________?

A: ms-1A B: ms-2A-1 C: kgms2A-1 D: kgm2s-1A-1

Q91 : When the motor is at its maximum speed then back emf will be______________?

A: Maximum B: Zero C: Intermediate values D: No back emf

Q92 : Class C amplifiers are used as ___________________?

A: AF amplifiers B: Detectors C: amplifiers D: None of the above

Q93 : Which of the following works on torque on the current carrying conductor placed in magnetic field ?

A: galvanometer B: ammeter C: voltmeter D: all of the above

Q94 : In a series resonant band-pass filter, a lower value of Q results in______________?

A: a higher impedance B: a smaller bandwidth C: a higher resonant frequency D: a larger bandwidth

Q95 : A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?

A: 0.57 V B: 6 V C: 12 V D: 5.7 V

Q96 : The input capacitor in an amplifier is the______________ capacitor?

A: Coupling B: Bypass C: Leakage D: None of the above

Q97 : An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?

A: 8 db B: 6 db C: 5 db D: 4 db

Q98 : A 25eV electron has a speed of______________?

A: 2 x 106m/sec B: 3 x 106m/sec C: 5 x 106m/sec D: 4 x 106m/sec

Q99 : The point of intersection of d.c. and a.c. load lines is called________________?

A: Saturation point B: Cut off point C: Operating point D: None of the above

Q100 : If the distance between the two point charges become half then force between them becomes______________?

A: double B: half C: four times D: remains same

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