Free Electrical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : 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

Q3 : A.C cannot be used for_______________?

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

Q4 : 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

Q5 : An OR gate has 6 inputs. The number of input words in its truth table are________________?

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

Q6 : Transformer coupling is generally employed when load resistance is______________?

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

Q7 : The most costly coupling is _______________ coupling?

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

Q8 : 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

Q9 : In a charged capacitor the energy resides in________________?

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

Q10 : The universal gate is ________________?

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

Q11 : 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

Q12 : 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

Q13 : 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

Q14 : Self inductance of a coil depends upon________________?

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

Q15 : A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?

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

Q16 : The output transformer used in a power amplifier is a _____________ transformer?

A: 1:1 ratio B: Step-up C: Step-down D: None of the above

Q17 : A class A power amplifier uses _________________?

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

Q18 : The only difference between construction of D.C generator and A.C generator is that of_______________?

A: carbon brushes B: coil C: commutator D: magnetic field

Q19 : 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

Q20 : A single stage transistor amplifier contains______________ and associated circuitry?

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

Q21 : 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

Q22 : 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

Q23 : 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

Q24 : In transistor amplifiers, we generally use______________ capacitors?

A: Electrolytic B: Mica C: Paper D: Air

Q25 : Transformer coupling can be used in______________amplifiers?

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

Q26 : 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

Q27 : The maximum efficiency of resistance loaded class A power amplifier is _________________?

A: 5% B: 50% C: 30% D: 25%

Q28 : Energy stored in a magnetic field is given by______________?

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

Q29 : 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

Q30 : 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

Q31 : The driver stage usually employs_________________?

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

Q32 : 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

Q33 : Long distance transmission is easy for________________?

A: D.C voltage B: Half A.C voltage C: A.C voltage D: Half D.C voltage

Q34 : An electric field can deflect_______________?

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

Q35 : A.C can not be used for_______________?

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

Q36 : A NAND gate is called a universal logic element because______________?

A: it is used by everybody B: any logic function can be realized by NAND gates alone C: all the minization techniques are applicable for optimum NAND gate realization D: many digital computers use NAND gates

Q37 : 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

Q38 : 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

Q39 : In RC coupling, the value of coupling capacitor is about_______________?

A: 100 pF B: 0.1 µF C: 0.01 µF D: 10 µF

Q40 : 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

Q41 : In the above question (Q38.) , what is the collector voltage ?

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

Q42 : 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

Q43 : 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

Q44 : The binary code of (21.125)10 is_______________?

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

Q45 : Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101 II. 1010 + 1101 = 10111 ?

A: III. 1010 + 1101 = 11111 B: I and II C: III only D: II and III

Q46 : 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

Q47 : Electric flux due to a point charge +q is______________?

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

Q48 : 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

Q49 : 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

Q50 : 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

Q51 : SI unit of the permittivity of free space is________________?

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

Q52 : 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

Q53 : A class A power amplifier is sometimes called______________amplifier?

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

Q54 : 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

Q55 : 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

Q56 : Weber is the unit of_____________?

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

Q57 : The number 1000 would appear just immediately after__________________?

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

Q58 : 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 %

Q59 : Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?

A: positively charged B: electrically neutral C: negatively charged D: positively and negatively charged

Q60 : The fan put of a 7400 NAND gate is_______________?

A: 2TTL B: 5TTL C: 8TTL D: 10TTL

Q61 : Class _____________ operation gives the maximum distortion?

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

Q62 : The input capacitor in an amplifier is the______________ capacitor?

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

Q63 : Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is__________________?

A: 10 CPS B: 120 CPS C: 12CPS D: None of the above

Q64 : Digital circuit can be made by the repeated use of________________?

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

Q65 : 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

Q66 : 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

Q67 : Which one of the following devices does not function like an electric motor ?

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

Q68 : 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

Q69 : 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

Q70 : 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

Q71 : The maximum efficiency of transformer coupled class A power amplifier is _______________?

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

Q72 : 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.

Q73 : 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

Q74 : 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

Q75 : 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

Q76 : When an input signal 1 is applied to a NOT gate, the output is ______________?

A: 0 B: 1 C: Either 0 & 1 D: None of the above

Q77 : 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

Q78 : The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?

A: More than B: The same as C: Less than D: Data insufficient

Q79 : Excess-3 code is known as_________________?

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

Q80 : 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

Q81 : 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

Q82 : Class_____________ power amplifier has the highest collector efficiency ?

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

Q83 : 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

Q84 : The input capacitor in an amplifier is the______________ capacitor?

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

Q85 : 1 db corresponds to_____________change in voltage or current level?

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

Q86 : 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

Q87 : 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

Q88 : If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

A: Vs/Vp = Np/Ns B: Vs/Vp = Ns/Np C: Vp/Vs = Ns/Np D: Vp/Vs = Np/Ns

Q89 : A 5 μF capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?

A: 2.5 x 10-8 C B: 10-5 C C: 103 C D: 4 x 103 C

Q90 : The output stage of a multistage amplifier is also called _________________-?

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

Q91 : In transistor amplifiers, we use_____________transformer for impedance matching?

A: Step up B: Step down C: Same turn ratio D: None of the above

Q92 : 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

Q93 : When a transistor amplifier is operating, the current in any branch is _______________?

A: Sum of a.c. and d.c. B: c. only C: c. only D: difference of a.c. and d.c.

Q94 : 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

Q95 : 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

Q96 : When the motor is at its maximum speed then back emf will be______________?

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

Q97 : The practical illustration of the phenomenon of mutual induction is____________?

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

Q98 : An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

A: 150msec-1 B: 384msec-1 C: 38.4msec-1 D: 200msec-1

Q99 : 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

Q100 : 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

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