Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : 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

Q3 : Photocopier and inject printer are dealt in________________?

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

Q4 : Excess-3 code is known as_________________?

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

Q5 : 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

Q6 : Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?

A: 1/4th of its original value B: 1/8th of its original value C: 4 times of its original value D: 8 times of its original value

Q7 : 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

Q8 : 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

Q9 : 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

Q10 : The best frequency response is of_____________coupling?

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

Q11 : 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

Q12 : 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

Q13 : (1(10101)2 is_______________?

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

Q14 : 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

Q15 : The binary number 10101 is equivalent to decimal number_________________?

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

Q16 : 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

Q17 : Electric flux due to a point charge +q is______________?

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

Q18 : 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

Q19 : 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

Q20 : 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

Q21 : 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.

Q22 : 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

Q23 : Solid Grounding is used for Voltages?

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

Q24 : The gain of an amplifier is expressed in db because_____________?

A: It is a simple unit B: Calculations become easy C: Human ear response is logarithmic D: None of the above

Q25 : Farad is the unit of___________?

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

Q26 : The binary code of (21.125)10 is_______________?

A: 10101.001 B: 10100.001 C: 10101.010 D: 10100.111

Q27 : An OR gate has 6 inputs. The number of input words in its truth table are________________?

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

Q28 : 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

Q29 : 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

Q30 : Transformer coupling can be used in______________amplifiers?

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

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 : 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

Q33 : The universal gate is ________________?

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

Q34 : 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

Q35 : A CE amplifier is also called _______________ circuit?

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

Q36 : 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

Q37 : 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

Q38 : A.C cannot be used for________________?

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

Q39 : 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

Q40 : In practice, voltage gain is expressed______________?

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

Q41 : The force per unit charge is know as__________________?

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

Q42 : 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

Q43 : A turbine is tripped when ?

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

Q44 : 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

Q45 : 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

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 : In the initial stages of a multistage amplifier, we use______________?

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

Q48 : Which instrument is used to measure the power of electric circuit ?

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

Q49 : Self-inductance of a long solenoid is______________?

A: μoN2A B: μoN2/A C: μoN2 D: BA

Q50 : 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

Q51 : When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?

A: twice the source voltage B: half the source voltage C: zero volts D: the same as the source voltage

Q52 : 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

Q53 : 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

Q54 : 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

Q55 : 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

Q56 : 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

Q57 : 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

Q58 : 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

Q59 : 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

Q60 : Transformer coupling is used for__________amplification?

A: Power B: Voltage C: Current D: None of the above

Q61 : The maximum collector efficiency of class B operation is ________________?

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

Q62 : If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?

A: Amplitude B: Intermodulation C: Frequency D: None of the above

Q63 : A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?

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

Q64 : 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

Q65 : 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

Q66 : 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

Q67 : Energy stored in a magnetic field is given by______________?

A: LI2 B: L2I/2 C: LI2/2 D: IL2

Q68 : 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

Q69 : RC coupling is used for_____________amplification?

A: Voltage B: Current C: Power D: None of the above

Q70 : 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 %

Q71 : 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

Q72 : In which of the following base systems is 123 not a valid number ?

A: Base 10 B: Base 16 C: Base8 D: Base 3

Q73 : 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

Q74 : 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

Q75 : 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

Q76 : The push-pull circuit must use ______________ operation?

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

Q77 : Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________? 0

A: 9 x 109N B: 9.2 x 104N C: 9 x 109N D: 9 x 107N

Q78 : 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

Q79 : 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

Q80 : 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

Q81 : 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

Q82 : 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

Q83 : 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

Q84 : 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

Q85 : 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

Q86 : Class_____________ power amplifier has the highest collector efficiency ?

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

Q87 : 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

Q88 : 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

Q89 : The positive (+) and negative (-) ends of the battery are called ___________?

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

Q90 : 1 db corresponds to_____________change in power level?

A: 50% B: 35% C: 26% D: 23%

Q91 : 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

Q92 : It is generally desired that a transistor should have_____________________ input impedance?

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

Q93 : 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

Q94 : A Wheatstone bridge can be used to determine an unknown_____________?

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

Q95 : 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

Q96 : Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is__________?

A: 0 dB B: 8.30 dB C: -8.30 dB D: 0.8 dB

Q97 : The inputs of a NAND gate are connected together. The resulting circuit is _______________?

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

Q98 : 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

Q99 : 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

Q100 : 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

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