Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : 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

Q3 : The upper or lower cut off frequency is also called______________frequency?

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

Q4 : Electric flux due to a point charge +q is______________?

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

Q5 : 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

Q6 : In class A operation, the operating point is generally located_____________of the d.c. load line?

A: At cut off point B: At the middle C: At saturation point D: None of the above

Q7 : An OR gate has 6 inputs. The number of input words in its truth table are________________?

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

Q8 : ________________ coupling is generally employed in power amplifiers?

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

Q9 : 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

Q10 : The lower and upper cut off frequencies are also called_____________frequencies?

A: Sideband B: Sideband C: Half-resonant D: Half-power

Q11 : Power amplifiers handle ______________ signals compare to voltage amplifiers?

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

Q12 : 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

Q13 : 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

Q14 : In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?

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

Q15 : What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?

A: 20% B: 80% C: 40% D: 50%

Q16 : 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

Q17 : 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

Q18 : 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

Q19 : 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

Q20 : 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

Q21 : 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

Q22 : A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?

A: 5 kO B: 20 kO C: 100 kO D: 10 kO

Q23 : Equipotential planes are_______________?

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

Q24 : The electric lines of force are____________?

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

Q25 : 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

Q26 : 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

Q27 : A class A power amplifier uses _________________?

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

Q28 : 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

Q29 : RC coupling is not used to amplify extremely low frequencies because____________?

A: There is considerable power loss B: There is hum in the output C: Electrical size of coupling capacitor becomes very large D: None of the above

Q30 : 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

Q31 : 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

Q32 : A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?

A: 1 MΩ B: 100 kΩ C: 1 kΩ D: 330 Ω

Q33 : 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

Q34 : 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

Q35 : In a CE amplifier, voltage gain =____________________ x RAC/Rin?

A: α B: (1 + α) C: (1+ β) D: β

Q36 : Weber is the unit of_____________?

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

Q37 : 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

Q38 : Which one of the following devices does not function like an electric motor ?

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

Q39 : In a charged capacitor the energy resides in________________?

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

Q40 : 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

Q41 : An over excited synchronous motor is used for____________?

A: fluctuating loads B: variable speed loads C: low torque loads D: power factor corrections

Q42 : 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

Q43 : The most costly coupling is _______________ coupling?

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

Q44 : 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

Q45 : 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

Q46 : 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

Q47 : 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

Q48 : 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

Q49 : 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

Q50 : 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

Q51 : If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?

A: Spiral path B: Straight line C: Curved path D: Circular path

Q52 : 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

Q53 : 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

Q54 : If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________?

A: 20 V B: 5 V C: 2 V D: 10 V

Q55 : A.C cannot be used for________________?

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

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

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

Q57 : Transformer coupling is generally employed when load resistance is______________?

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

Q58 : Non inductive resistances are used in decreasing______________?

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

Q59 : 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

Q60 : 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

Q61 : The value of emitter capacitor CE in a multistage amplifier is about____________?

A: 1 µF B: 100 pF C: 0.01 µF D: 50 µF

Q62 : 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

Q63 : Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor is_________?

A: 24 V B: 12 V C: 0 V D: 6 V

Q64 : 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

Q65 : SI unit of the permittivity of free space is________________?

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

Q66 : 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.

Q67 : 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

Q68 : 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

Q69 : Which one of the following functions like a motor ?

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

Q70 : 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

Q71 : What is the octal equivalent of the binary number : 10111101 ?

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

Q72 : In the above question (Q38.) , what is the collector voltage ?

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

Q73 : A radio receiver has____________of amplification?

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

Q74 : The input capacitor in an amplifier is the______________ capacitor?

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

Q75 : _____________coupling provides the maximum voltage gain?

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

Q76 : 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

Q77 : 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

Q78 : Excess-3 code is known as_________________?

A: Weighted code B: Cyclic redundancy code C: Self-complementing code D: Algebraic code

Q79 : 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

Q80 : 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

Q81 : The value of the capacitance depends upon the________________?

A: voltage applied B: thickness of the capacitor plates C: geometry of the capacitor D: dinsity of the capacitor plates

Q82 : The current flowing through an unloaded voltage divider is called the____________?

A: bleeder current B: load current C: resistor current D: voltage current

Q83 : 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

Q84 : The maximum efficiency of transformer coupled class A power amplifier is _______________?

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

Q85 : 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

Q86 : 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

Q87 : 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

Q88 : 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

Q89 : The driver stage usually employs_________________?

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

Q90 : Transformer coupling can be used in______________amplifiers?

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

Q91 : The size of a power transistor is made considerably large to________________?

A: Provide easy handling B: Dissipate heat C: Facilitate connections D: None of the above

Q92 : 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

Q93 : The universal gate is ________________?

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

Q94 : 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

Q95 : Self inductance of a coil depends upon________________?

A: current flowing B: number of turns per unit length C: voltage produce D: all

Q96 : Transformer coupling provides high efficiency because___________?

A: Collector voltage is stepped up B: resistance is low C: collector voltage is stepped down D: none of the above

Q97 : 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

Q98 : Which one of the following can be taken as the measure of electric intensity ?

A: F/A B: V/A C: VF/A D: q/VA

Q99 : A debouncing circuit is________________?

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

Q100 : 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

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