Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : What is the octal equivalent of the binary number : 10111101 ?

A: 675 B: 275 C: 572 D: 573

Q2 : For highest power gain, one would use _________________configuration?

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

Q3 : The only function of NOT gate is to__________________?

A: Stop signal B: Invert input signal C: Act as a universal gate D: None of the above

Q4 : A CE amplifier is also called _______________ circuit?

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

Q5 : Regenerative method of braking is based on that___________?

A: back e.m.f. is less than the applied voltage B: back e.m.f. is equal to the applied voltage C: back e.m.f. of rotor is more than the applied voltage D: none of the above

Q6 : 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

Q7 : N/C =_____________?

A: V/A B: J/V C: V/m D: A/m

Q8 : A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720 Ω, and R4 = 2.4 kΩ. The unknown resistance is_____________?

A: 24 Ω B: 2.4 Ω C: 300 Ω D: 3,000 Ω

Q9 : Power amplifiers handle ______________ signals compare to voltage amplifiers?

A: Small B: Very small C: Large D: None of the above

Q10 : The push-pull circuit must use ______________ operation?

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

Q11 : The force per unit charge is know as__________________?

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

Q12 : 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

Q13 : If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?

A: 600 db B: 24 db C: 14 db D: 27 db

Q14 : Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is____________?

A: 138 Ω B: 1,389 Ω C: 5,700 Ω D: 880 Ω

Q15 : 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

Q16 : 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

Q17 : The noise factor of an ideal amplifier expressed in db is_____________?

A: 0 B: 1 C: 1 D: 10

Q18 : A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?

A: 0 volt B: 3.125 volt C: 31.25 volt D: 0.03125 volt

Q19 : The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?

A: Transistor B: Biasing circuit C: Collector supply VCC D: None of the above

Q20 : The upper or lower cut off frequency is also called______________frequency?

A: Resonant B: Sideband C: 3 db D: None of the above

Q21 : 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

Q22 : 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

Q23 : 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

Q24 : c. power into a.c. power

A: c. power into d.c. power B: high resistance into low resistance C: none of the above D: c. power into a.c. power

Q25 : A power amplifier has comparatively __________________ ß ?

A: Small B: Large C: Very large D: None of the above

Q26 : 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

Q27 : The slope of a.c. load line is ______________ that of d.c. load line?

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

Q28 : A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

A: 459 Hz B: 4,591 Hz C: 999 Hz D: 999 Hz

Q29 : 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

Q30 : In a series–parallel circuit, individual component power dissipation are calculated using_____________?

A: individual component parameters B: a percent of the total power depending on resistor ratios C: total current squared multiplied by the resistor values D: a percent of the voltage division ratio squared

Q31 : The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?

A: Avoid voltage gain drop B: Forward bias the emitter C: Reduce noise in the amplifier D: None of the above

Q32 : Equivalent capacitance is greater than individual capacitances in_____________?

A: series combination B: parallel combination C: both series and parallel combinations D: none of above

Q33 : Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000 ?

A: Two’s complement only B: Sign and magnitude and one’s complement only C: Two’s complement and one’s complement only D: All three representations

Q34 : A.C and D.C have the same______________?

A: effect in charging a capacitor B: effect in charging a battery C: effect while passing through an inductance D: heating effect through a resistance

Q35 : A debouncing circuit is________________?

A: an astable MV B: a bistable MV C: a latch D: a monostable MV

Q36 : In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?

A: RC + RL B: RL C: RC D: RC

Q37 : 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

Q38 : Solid Grounding is used for Voltages?

A: Above 220 kv B: Above 11kv C: Below 660 v D: Below 115 v

Q39 : On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?

A: 1 V B: 50 V C: 500 V D: 1,000 V

Q40 : A current amplification of 2000 is a gain of_________________?

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

Q41 : A class A power amplifier is sometimes called______________amplifier?

A: Symmetrical B: Single-ended C: Reciprocating D: Differential

Q42 : An RL low-pass filter consists of a 5.6 mH coil and a 3.3 kΩ resistor. The output voltage is taken across the resistor. The circuit’s critical frequency is______________?

A: 93.8 kHz B: 93.8 Hz C: 861 Hz D: 86.12 kHz

Q43 : Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?

A: Retaintivity B: Permeability C: Flux D: Hysteresis

Q44 : 1 db corresponds to_____________change in voltage or current level?

A: 40% B: 80% C: 20% D: 25%

Q45 : In practice, voltage gain is expressed______________?

A: In db B: In volts C: As a number D: None of the above

Q46 : 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

Q47 : Power loss in actual transformer is due to_________________?

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

Q48 : In Boolean algebra, the bar sign (-) indicates__________________?

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

Q49 : A turbine is tripped when ?

A: inlet pressure increase B: speed shoots up C: exhaust gets choked D: steam flow gets clogged

Q50 : In the above question (Q38.) , what is the collector voltage ?

A: 3 V B: 8 V C: 6 V D: 7 V

Q51 : 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

Q52 : If the power level of an amplifier reduces to half, the db gain will fall by___________?

A: 5 db B: 2 db C: 10 db D: 3 db

Q53 : A Wheatstone bridge can be used to determine an unknown_____________?

A: current B: voltage C: resistance D: power

Q54 : The ratio of output impedance of a CE amplifier is _______________?

A: About 1 B: Low C: High D: Moderate

Q55 : The parallel combination of a 6.8 kΩ resistor and a 10 kΩ resistor is in series with the parallel combination of a 2.2 kΩ resistor and a 1 kΩ resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?

A: 6.8 kΩ B: 2.2 kΩ C: 6.8 kΩ and 10 kΩ D: 2.2 kΩ and 1 kΩ

Q56 : 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

Q57 : 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

Q58 : The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?

A: Power loss in the coupling device B: Loading effect of the next stage C: The use of many transistors D: The use of many capacitors

Q59 : 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

Q60 : The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?

A: 5 mV B: 2 mV C: 8 mV D: 5 mV

Q61 : An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit’s critical frequency is___________?

A: 333 kHz B: 633 kHz C: 331 kHz D: 60 kHz

Q62 : The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?

A: 20,000 Ω B: 100,000 Ω C: 200,000 Ω D: 1,000,000 Ω

Q63 : An advantage of RC coupling scheme is the___________?

A: Good impedance matching B: Economy C: High efficiency D: None of the above

Q64 : 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

Q65 : Which instrument is used to measure the power of electric circuit ?

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

Q66 : A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?

A: RC B: RC || RE C: RC – RE D: RC + RE

Q67 : The NAND gate is AND gate followed by_________________?

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

Q68 : Photocopier and inject printer are dealt in________________?

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

Q69 : 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

Q70 : 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

Q71 : A dynamo converts______________?

A: mechanical energy into electrical energy B: electrical energy into mechanical energy C: magnetic energy into mechanical energy D: magnetic energy into electrical energy

Q72 : 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

Q73 : Magnetic compass needle will be deflecting if it is kept near________________?

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

Q74 : An AND gate will function as OR if________________?

A: all the inputs to the gates are “1” B: all the inputs are ‘0’ C: either of the inputs is “1” D: all the inputs and outputs are complemented

Q75 : An alternating current or voltage________________?

A: fluctuates off and on B: varies in magnitude alone C: changes its direction again and again D: changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Q76 : A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

A: 5.14 MHz B: 514 kHz C: 5.03 MHz D: 503 kHz

Q77 : A gain of 1000 times in voltage is expressed by_______________?

A: 60 db B: 30 db C: 120 db D: 600 db

Q78 : An OR gate has 6 inputs. The number of input words in its truth table are________________?

A: 6 B: 32 C: 62 D: 64

Q79 : Three 10 kΩ resistors are connected in series. A 20 kΩ resistor is connected in parallel across one of the 10 kΩ resistors. The voltage source is 24 V. The total current in the circuit is___________?

A: 900 μA B: 9 mA C: 90 mA D: 800 μA

Q80 : An amplifier has a power gain of 100. Its db gain is ________________?

A: 10 db B: 20 db C: 40 db D: None of the above

Q81 : select the only wrong statement?

A: similar charges repel each other B: dissimilar charges attract each other C: repulsion is the sure test of electrification D: an electrically neutral body is repelled both positively and negatively charged bodies

Q82 : The maximum efficiency of transformer coupled class A power amplifier is _______________?

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

Q83 : 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

Q84 : 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

Q85 : The purpose of RC or transformer coupling is to_____________?

A: Block a.c. B: Separate bias of one stage from another C: Increase thermal stability D: None of the above

Q86 : A certain circuit is composed of two parallel resistors. The total resistance is 1,403 Ω. One of the resistors is 2 kΩ. The other resistor value is____________?

A: 1,403 Ω B: 4.7 kΩ C: 2 kΩ D: 3,403 Ω

Q87 : What is/are the configurable functions of each and every IOBs connected around the FPGA device from the operational point of view ?

A: Input operation B: Tristate output operation C: Bi-directional I/O pin access D: All of the above

Q88 : If the coil is wound on an iron core the flux through it will_______________?

A: decrease B: become zero C: remain the same D: increase

Q89 : When a transistor is cut off _________________?

A: Maximum voltage appears across transistor B: Maximum current flows C: Maximum voltage appears across load D: None of the above

Q90 : 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

Q91 : Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits ?

A: State Reduction B: State Minimization C: State Assignment D: State Evaluation

Q92 : Non inductive resistances are used in decreasing______________?

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

Q93 : The purpose of capacitors in a transistor amplifier is to___________________?

A: Protect the transistor B: Cool the transistor C: Couple or bypass a.c. component D: Provide biasing

Q94 : Electric flux due to a point charge +q is______________?

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

Q95 : The input capacitor in an amplifier is the______________ capacitor?

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

Q96 : The number of Boolean functions that can be generated by n variables is equal to_________________?

A: 2n B: 22 n C: 2n-1 D: — 2n

Q97 : Electric intensity at infinite distance from the point charge is_____________?

A: zero B: infinite C: positive D: negative

Q98 : A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________?

A: 900 volts B: 9000 volts C: 90 volts D: zero

Q99 : Self-inductance of a long solenoid is______________?

A: μoN2A B: μoN2/A C: μoN2 D: BA

Q100 : In a CE amplifier, voltage gain =____________________ x RAC/Rin?

A: α B: (1 + α) C: (1+ β) D: β

Free Electrical Engineering MCQs Mock Test Online with Answers

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