Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

A: Magnetic flux density B: Torque C: Mutual induction D: Motional emf

Q3 : 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

Q4 : 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

Q5 : 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

Q6 : 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

Q7 : 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

Q8 : Equivalent capacitance is greater than individual capacitances in_____________?

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

Q9 : Transformer coupling can be used in______________amplifiers?

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

Q10 : The ear is not sensitive to___________?

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

Q11 : 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

Q12 : Electric intensity at infinite distance from the point charge is_____________?

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

Q13 : The lower and upper cut off frequencies are also called_____________frequencies?

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

Q14 : The binary number 10101 is equivalent to decimal number_________________?

A: 19 B: 12 C: 27 D: 21

Q15 : 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

Q16 : 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

Q17 : Photocopier and inject printer are dealt in________________?

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

Q18 : Excess-3 code is known as_________________?

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

Q19 : An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit’s critical frequency is___________?

A: 125 Hz B: 1,250 Hz C: 564 Hz D: 5,644 Hz

Q20 : Digital circuit can be made by the repeated use of________________?

A: OR gates B: NOT gates C: NAND gates D: None of the above

Q21 : 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

Q22 : The electric lines of force are____________?

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

Q23 : Class C amplifiers are used as ___________________?

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

Q24 : 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

Q25 : The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8C. If the spheres are connected by a copper wire_______________?

A: charge will flow from A to B B: charge will flow from B to A C: no flow of charge will occur D: both a and b are possible

Q26 : The driver stage usually employs_________________?

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

Q27 : 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

Q28 : 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

Q29 : select the correct statement?

A: the electric lines of force have no physical existence B: they expand laterally and contract longitudinally C: they do not cross each other and group together in dielectric D: all the above statements are true

Q30 : The final stage of a multistage amplifier uses______________?

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

Q31 : 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

Q32 : 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

Q33 : 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

Q34 : (1(10101)2 is_______________?

A: (37)10 B: ( 69)10 C: (41 )10 D: — (5)10

Q35 : An over excited synchronous motor is used for____________?

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

Q36 : At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________?

A: 6.02 dB B: -6.02 dB C: 12.04 dB D: -12.04 dB

Q37 : 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

Q38 : 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

Q39 : 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

Q40 : What is the octal equivalent of the binary number : 10111101 ?

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

Q41 : 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

Q42 : What would happen, if smaller logic modules are utilized for performing logical functions associated with FPGA? A. Propagation delay will increase B. FPGA area will increase C. Wastage of logic modules will not be prevented D. Number of interconnected paths in device will decrease ?

A: A & B B: C & D C: A & D D: B & C

Q43 : Power amplifiers handle ______________ signals compare to voltage amplifiers?

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

Q44 : The electric charge of 100 °C is 13cm apart from another charge 16.9°C electric force between them is_____________?

A: 9x107N B: 900N C: 9x105N D: 9x106N

Q45 : 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

Q46 : 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

Q47 : 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

Q48 : A.C cannot be used for________________?

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

Q49 : 1 db corresponds to_____________change in voltage or current level?

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

Q50 : Most of the digital computers do not have floating point hardware because_____________?

A: floating point hardware is costly B: it is slower than software C: it is not possible to perform floating point addition by hardware D: of no specific reason.

Q51 : Weber is the unit of_____________?

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

Q52 : 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

Q53 : The number 1000 would appear just immediately after__________________?

A: FFFF (hex) B: 1111 (binary) C: 7777 (octal) D: All of the above

Q54 : 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

Q55 : Solid Grounding is used for Voltages?

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

Q56 : A class A power amplifier is sometimes called______________amplifier?

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

Q57 : The input capacitor in an amplifier is the______________ capacitor?

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

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

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

Q60 : 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

Q61 : 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)

Q62 : A power amplifier has comparatively __________________ ß ?

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

Q63 : 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

Q64 : A class A power amplifier is sometimes called______________amplifier?

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

Q65 : For long distance transmission the transformer used is_____________?

A: Step down B: Input voltage and output voltage remain same C: Step up D: Amplifier is used

Q66 : Equipotential planes are_______________?

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

Q67 : 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

Q68 : 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

Q69 : 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

Q70 : 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

Q71 : An OR gate has 6 inputs. The number of input words in its truth table are________________?

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

Q72 : 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

Q73 : 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

Q74 : 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

Q75 : The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?

A: 12.73 V peak-to-peak B: 18 V peak-to-peak C: 9 V peak-to-peak D: zero

Q76 : The phase difference between the output and input voltages of a CE amplifier is _____________?

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

Q77 : The output stage of a multistage amplifier is also called _________________-?

A: Mixer stage B: Power stage C: Detector stage D: F stage

Q78 : 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

Q79 : 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

Q80 : A CE amplifier is also called _______________ circuit?

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

Q81 : The positive (+) and negative (-) ends of the battery are called ___________?

A: circuit diagram B: battery knobs C: battery terminals D: battery sides

Q82 : 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

Q83 : 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

Q84 : Electric flux due to a point charge +q is______________?

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

Q85 : The most important consideration in power amplifier is __________________?

A: Biasing the circuit B: Collector efficiency C: To keep the transformer cool D: None of the above

Q86 : 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

Q87 : Class_____________ power amplifier has the highest collector efficiency ?

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

Q88 : If a charged rod is brought closer to a gas filled balloon then______________?

A: Radius decreases B: Balloon bursts C: Radius increase D: Balloon squeezes

Q89 : An electric field can deflect_______________?

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

Q90 : 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

Q91 : Class _____________ operation gives the maximum distortion?

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

Q92 : The practical illustration of the phenomenon of mutual induction is____________?

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

Q93 : Farad is the unit of___________?

A: inductance B: voltage C: capacitance D: None of these

Q94 : 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

Q95 : 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

Q96 : 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

Q97 : 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

Q98 : A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?

A: 1 MΩ B: 24 kΩ C: 18 kΩ D: 12 kΩ

Q99 : In an RC coupling scheme, the coupling capacitor CC must be large enough______________?

A: To pass d.c. between the stages B: Not to attenuate the low frequencies C: To dissipate high power D: None of the above

Q100 : 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

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