Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?

A: 5 W B: 33 W C: 75 W D: 1 W

Q2 : 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

Q3 : In the zero signal conditions, a transistor sees _____________ load?

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

Q4 : _____________coupling provides the maximum voltage gain?

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

Q5 : An electric field can deflect_______________?

A: Neutrons B: X-rays C: Both glass rod and silk acquire a negative charge D: None

Q6 : 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

Q7 : In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?

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

Q8 : The minimum charge on any object cannot be less than_______________?

A: 1.6 x 10-19C B: 3.2 x 10-19C C: 9.1 x 109C D: no definite value exist

Q9 : The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?

A: 10.60 V B: 0 V C: 21.21 V D: 15 V

Q10 : 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

Q11 : In a certain low-pass filter, fc = 3.5 kHz. Its passband is____________?

A: 3.5 kHz B: 0 Hz C: 0 Hz to 3.5 kHz D: 7 kHz

Q12 : Positive logic in a logic circuit is one in which______________?

A: logic 0 and 1 are represented by 0 and positive voltage respectively B: logic 0 and, -1 are represented by negative and positive voltages respectively C: logic 0 voltage level is higher than logic 1 voltage level D: logic 0 voltage level is lower than logic 1 voltage level

Q13 : With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?

A: 200 mA B: 400 mA C: 600 mA D: 800 mA

Q14 : 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

Q15 : A transistor amplifier has high output impedance because ______________?

A: Emitter is heavily doped B: Collector has reverse bias C: Collector is wider than emitter or base D: None of the above

Q16 : 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

Q17 : Class_____________ power amplifier has the highest collector efficiency ?

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

Q18 : Magnetic compass needle will be deflecting if it is kept near________________?

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

Q19 : 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

Q20 : Which type of CPLD packaging can provide maximum number of pins on the package due to small size of the pins ?

A: . PLCC B: QFP C: PGA D: BGA

Q21 : 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

Q22 : When the motor is at its maximum speed then back emf will be______________?

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

Q23 : The maximum efficiency of transformer coupled class A power amplifier is _______________?

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

Q24 : Weber is the unit of_____________?

A: Magnetic field intensity B: magnetic induction C: magnetic flux D: self-inductance

Q25 : In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

A: 0 V B: 5.97 V C: 6 V D: 597 mV

Q26 : 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

Q27 : 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

Q28 : In practice, voltage gain is expressed______________?

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

Q29 : If the input capacitor of a transistor amplifier is short-circuited, then_________________?

A: Transistor will be destroyed B: Biasing conditions will change C: Signal will not reach the base D: None of the above

Q30 : 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.

Q31 : The output stage of a multistage amplifier usually employs______________?

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

Q32 : 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

Q33 : The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?

A: Decreases the resistance of the solenoid B: Reduces the effect of eddy current C: Improves the flux linkage between the turns of the coil D: Increases the mutual inductance between the solenoid and the core

Q34 : In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?

A: 180o B: 270o C: 90o D: 0o

Q35 : The practical illustration of the phenomenon of mutual induction is____________?

A: A.C generator B: D.C dynamo C: induction coil D: transformer

Q36 : 1 Coulomb = ___________ e.

A: 6×10-19 B: 6.25×1018 C: 1.6×1019 D: 6.25×10-18

Q37 : 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

Q38 : SI unit of the permittivity of free space is________________?

A: Nm2C2 B: N-1mC-2 C: NmC-1 D: N-1m-2C2

Q39 : In a CE amplifier, voltage gain =____________________ x RAC/Rin?

A: α B: (1 + α) C: (1+ β) D: β

Q40 : It is generally desired that a transistor should have_____________________ input impedance?

A: Low B: Very low C: High D: Very high

Q41 : 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

Q42 : 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

Q43 : If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?

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

Q44 : The force per unit charge is know as__________________?

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

Q45 : 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

Q46 : 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

Q47 : What is the octal equivalent of the binary number : 10111101 ?

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

Q48 : Which of the following uses electric energy and does not convert it into any other form ?

A: transformer B: motor C: D.C generator D: A.C generator

Q49 : A 2-transistor class B power amplifier is commonly called ______________ amplifier?

A: Dual B: Push-pull C: Symmetrical D: Differential

Q50 : 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

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 : In a charged capacitor the energy resides in________________?

A: magnetic hield B: electric field C: nuclear field D: gravitational field

Q53 : 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

Q54 : Power amplifiers handle ______________ signals compare to voltage amplifiers?

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

Q55 : At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filter’s bandwidth is____________?

A: 530 Hz B: 106 Hz C: 11.5 Hz D: 53 Hz

Q56 : A Wheatstone bridge can be used to determine an unknown_____________?

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

Q57 : The purpose of a coupling capacitor in a transistor amplifier is to ___________________?

A: Increase the output impedance of transistor B: Protect the transistor C: Pass a.c. and block d.c. D: Provide biasing

Q58 : 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

Q59 : Electric flux linked with a surface will be maximum when____________?

A: The surface is held parallel to the electric field B: The surface is held perpendicular to the electric field C: The surface makes an angle of 45°with the field D: All of the above

Q60 : Equipotential planes are_______________?

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

Q61 : 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

Q62 : 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

Q63 : 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

Q64 : In a series–parallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2‘s voltage will:___________?

A: increase B: remain the same C: decrease D: cannot tell

Q65 : If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?

A: High B: Very high C: Moderate D: Low

Q66 : 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

Q67 : A debouncing circuit is________________?

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

Q68 : The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?

A: 10 W B: 15 W C: 5 W D: 20 W

Q69 : Transformer coupling can be used in______________amplifiers?

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

Q70 : 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

Q71 : The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?

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

Q72 : 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

Q73 : The input capacitor in an amplifier is the______________ capacitor?

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

Q74 : A class A power amplifier uses _________________?

A: Three transistors B: Two transistors C: One transistor D: None of the above

Q75 : A gain of 1,000,000 times in power is expressed by_____________?

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

Q76 : A.C can not be used for_______________?

A: producing heat B: producing light C: Magnetizing iron D: Producing magnetic field

Q77 : 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

Q78 : A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?

A: 1.1 mV B: 11.1 mV C: 111 mV D: 200 mV

Q79 : A gain of 1000 times in voltage is expressed by_______________?

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

Q80 : A capacitor is a perfect insulator for______________?

A: direct current B: alternating current C: both for the direct and alternating current D: none of above

Q81 : Equivalent capacitance is greater than individual capacitances in_____________?

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

Q82 : An electric charge at rest produces_______________?

A: only a magnetic field B: only an electric field C: neither electric field nor magnetic field D: both electric and magnetic fields

Q83 : Which one of the following devices does not function like an electric motor ?

A: Galvanometer B: Ammeter C: Voltmeter D: Transformer

Q84 : In the above question (Q38.) , what is the collector voltage ?

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

Q85 : Which is the correct order of sequence for representing the input values in K-map ?

A: (00, 01, 10, 11) B: (00, 10, 01, 11) C: (00, 01, 11, 10) D: (00, 10, 11, 01)

Q86 : 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

Q87 : Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?

A: decrease B: increase C: remain constant D: depends upon composition of dielectric

Q88 : A radio receiver has____________of amplification?

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

Q89 : 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

Q90 : emf induced in a circuit according to Faradays law depends on the_____________?

A: maximum magnetic flux B: rate of change of magnetic flux C: change in magnetic flux D: initial magnetic flux

Q91 : 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

Q92 : 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

Q93 : A.C cannot be used for_______________?

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

Q94 : If metallic conductor is charged negatively then its weight______________?

A: Remains same B: First increases then decreases C: Decreases then increases D: Increases for a while

Q95 : The parallel combination of a 470 Ω resistor and a 680 Ω resistor is in series with the parallel combination of four 2 kΩ resistors. The total resistance is___________?

A: 1,650 Ω B: 1,078 Ω C: 77.8 Ω D: 778 Ω

Q96 : The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?

A: 10.60 V B: 0 V C: 21.21 V D: 15 V

Q97 : 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

Q98 : If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?

A: 165 B: 165 x 104 C: 100 D: None of the above

Q99 : Which of the following is the major consideration to evolve a good design?

A: Cost B: Durability C: Compliance with performance criteria as laid down in specifications D: All of the above

Q100 : 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

Free Electrical Engineering MCQs Mock Test Online with Answers

Time to prove what you know!

LAT Test

GAT Test

Contact Info

Free Electrical Engineering MCQs Mock Test Online with Answers

Subscribe our Newsletter

LAT Test

GAT Test

Contact Info