BASICS OF ELECTRONICS AND MICROPROCESSOR

401. What materials are meter pointers normally made?A.    CopperB.     IronC.     ZincD.    AluminumANSWER: D

402. In NPN transistor, when emitter junction is forward biased and collector junction is reversed biased, the transistor will operate inA.    cut off regionB.     saturation regionC.     active regionD.    inverted regionANSWER: A

403. An instrument used to detect presence, sign and in some configurations the magnitude of an electric charge by the mutual attraction or repulsion of metal foils or pith balls.

A.    ElectroscopeB.     ElectrometerC.     Electron microscopeD.    ElectrographANSWER: A

404. The total number of magnetic lines force leaving or entering the pole of a magnet.A.    Potential fieldB.     Magnetic fieldC.     Magnetic spaceD.    Magnetic fluxANSWER: D

405. What IF frequencies are normally used in radar receivers?

A.    30 or 60 MHzB.     60 or 80 MHzC.     30 or 40 MHzD.    60 or 70 MHzANSWER: A

406. Mechanical rotation frequency is measured using a device called ___.A.    Frequency counterB.     Accelerometer

C.     Frequency meterD.    TachometerANSWER: D

407. Electrical-output frequencies of ac generators can be measured by ___.A.    Vibrating-reed devices or tuned circuitsB.     AccelerometerC.     Frequency meterD.    TachometerANSWER: A

408. What wavemeter is used for measuring frequencies in the microwave range?A.    Frequency counterB.     Cavity wavemeterC.     BolometerD.    Absorption wavemeterANSWER: B

409. What is commonly used for the analysis of waveforms generated by electronic equipment?A.    Frequency counterB.     Cavity wavemeterC.    Cathode-ray oscilloscope(CRO or O-SCOPE)D.    BolometerANSWER: C

410. The rotation frequency of recording devices and teletypewriter motors can be measured by the use of a ___.

A.    TachometerB.     Frequency counterC.     OscilloscopeD.    StroboscopeANSWER: D

411. What type of bolometer is characterized by decrease in resistance as the power increases?A.    Chronometric tachometerB.     BarretterC.     StrobotacD.    ThermistorANSWER: D

412. What is the normal operating voltage and current for a light-emitting diode?A.    60 volts and 20 mAB.     5 volts and 50 mAC.    1.7 volts and 20 mAD.    0.7 volts and 60 mA

ANSWER: C

413. What type of bias is required for an LED to produce luminescence?A.     Reverse biasB.    Forward biasC.     Zero biasD.     Inductive biasANSWER: B

414. Packaging is required for what reason in IC production?A.    To meet storage requirementB.     To increase shelf-lifeC.     To dissipate heatD.    Ease of handling and protection from damageANSWER: D

415. What do you call the ratio between the intensity of magnetization produced in a substance, to the source of magnetizing force?A.    Magnetic resistivityB.     Magnetic conductivityC.    Magnetic susceptibilityD.    Magnetic reluctivityANSWER:C

416. What do you call an assembly of microcircuits or a combination of microcircuits and discrete components packaged as replacement?A.     Electronic moduleB.     Microcircuit moduleC.    PCBD.    MinielectronicsANSWER: B

417. In the operation of dry cells, we normally refer to the supply of current to load resistance where its current neutralizes the separated charges at the electrodes as ________>.A.    aligning the cellsB.     charging the cellsC.    discharging the cellsD.    polarizing the cellsANSWER: C

418. What are the special class C amplifiers that are biased at 3 to 10 times the normal cutoff and used to generate frequency that is a harmonic of a lower frequency?A.    Frequency generatorsB.     Frequency stabilizersC.    Frequency multipliers

D.    Frequency amplifiersANSWER: C

419. Which of the following capacitors costs more per µF of capacitance?A.    PlasticB.     MicaC.     PaperD.    ElectrolyticANSWER: D

420. What capacitors are suitable for dc filter circuits?A.    MicaB.     ElectrolyticC.     CeramicD.    Plastic ANSWER: B

421. What is the other name or relative permittivity?A.    Dielectric strength B.     Breakdown voltageC.    Specific inductive capacityD.    Potential gradientANSWER: C

422. In RF amplifier with optimum coupling, what method provides the widest bandpass?A.    A parallel circuitB.     A swamping resistorC.     A parallel variable resistorD.    A dc coupling capacitorANSWER: B

423. What is the operating condition of a circuit when no input signal is being applied to the circuit?

A.    NeutralB.     QuantumC.    QuiescenceD.    No load conditionANSWER: C

424. In a sawtooth generator, increasing gate does what to linearity?A.    NothingB.     Increases linearityC.     Blocks linearityD.    Decreases linearityANSWER: D

425. Why are digital multimeters well suited for testing sensitive devices?A.    High current flowB.     It is portable and ruggedizedC.     Because of its sensitivityD.    Current flows through the component is limited to 1 mAANSWER: D

426. Compensation to an op-amp means ________ bandwidth and _________ slew rate.A.    reduced, increasedB.     reduced, reducedC.     increased, reducedD.    increased, increasedANSWER: A

427. What does the base or radix of a number system tell you about the system?A.    Number of units used in the systemB.     Number of items used in the systemC.    Number of symbols used in the systemD.    Number of numerals used in the systemANSWER: C

428. The specific gravity of a lead-acid battery is a measure of its ______A.    battery lifeB.     operating temperatureC.    state of chargeD.    rate of dischargeANSWER: C

429. In active filter, what type of filter passes a range of frequency and a certain higher frequency?A.    Band-stopB.     High passC.     Low passD.    Band-passANSWER: D

430. In a Transformer, The primary flux is always _________ the secondary ( flux).A. Greater then B. Smaller then C. EqualD. Equal in both step up and Step down TransformerANSWER: D

431. What would happen if we operate a 60 Hz Transformer on 50 Hz Source of Supply.(and how can we do that?

A. Current will decrease (so increase the current)B. Current will increase ( so decrease the current)C. Current will be same in both cases. D. No Effect ( We can do that without changing anything)E.  We can't perform such an operation.ANSWER: B

432. The rating of transformer may be expressed in ____________.A. kWB. kVARC. kVAD. Horse power. ANSWER: C

433. What will happen if the primary of a transformer is connected to D.C supply?A. Transformer will operate with low efficiencyB. Transformer will operate with high efficiencyC.  No effect D. Transformer may start to smoke and burnANSWER: D

434. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage?A.  Current will be too much highB.  Transformer may start to smoke and burnC.  Eddy Current and Hysteresis loss will be excessiveD.  No effectANSWER: C

435. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 5 Hz (frequency) source of the same voltage? A.  Current will be too much lowB.  Transformer may start to smoke C.  Eddy Current and Hysteresis loss will be excessiveD.  No effectANSWER: B

436. A Step Up transformer _____________. A. Step Up the level of VoltageB. Step down the level of currentC. Step up level the powerD. Step up the level of FrequencyE. 1 and 2 only ANSWER: E

437. Under what condition is D.C supply applied safely to the primary of a transformer? 

A. We can connect directly to DC. No condition requiredB. We can't connect to DC SupplyC. A High resistance should be connect in series with primary, but circuit will be

useless.D.  The above statement is wrongANSWER: C

438. An Auto-transformer (which has only one winding) may be used as a ______?A. Step-Up TransformerB. Step-Down TransformerC. Both Step-Up and Step-Down transformerD. None of the aboveANSWER: C

439. E.M.F Equation of the Transformer is _________.A. E1 = 4.44 f N1 Øm      ,    E2=4.44 f N2 Øm B. E1 = 4.44 f N1 Bm A   ,   E2 = 4.44 f N2 Bm A C. E1= 4.44 N1 Øm/T     ,    E2=4.44 N2 Øm/T D. All of the above E. None of the above ANSWER: D

440. The friction losses in  Real Transformers are _________?A. 0% B. 5% C. 25%D. 50% ANSWER: A

441. In Three Phase Transformer, The load Current is 139.1A, and Secondary Voltage is 415V. The Rating of the Transformer would be ___________.A. 50kVA B. 57.72kVA C. 100kVA D. 173kVA ANSWER: C

442. In Single Phase Transformer, The Primary Current and Primary Voltage is 4.55 and 11kV respectively. The Rating of the transformer would be________?A. 50kVA B. 86kVA C. 100kVA D. 150kVA ANSWER: A

443. An Isolation Transformer Has Primary to Secondary turns ratio of __________.

A. 1 : 2  B. 2 : 1 C. 1 : 1 D. Can be any ratioANSWER: C

444. In an Auto Transformer, The Primary and Secondary are__________Coupled.A. Only MagneticallyB. Only ElectricallyC. Magnetically as well as ElectricallyD. None of the above ANSWER: C

445. A Transformer______________.A. Changes ac to DCB. Changes dc to ACC. Steps up or down DC Voltages & CurrentD. Steps up or down AC Voltages & Current.ANSWER: D

446. The Mark on Ceramic or Non-Polarized Capacitors is "104". What is the value of Capacitor?A. 104 µFB. 10000 µFC. 10000 nFD. 100000 pFANSWER: D

447. In Ideal case, the Charging current for 200Ah battery would be _________ ?A. 10 A B. 12 A C. 15 A D. 20 AANSWER: D

448. In Real case, the Charging current for 200Ah battery would be _________ ?A. 20-22 A B. 14-16 A C. 12-14 A D. 10-12 AANSWER: A

449. In Ideal case, the Charging Time for 200Ah battery would be _________ ?A. 5 hours B. 10 hours C. 15 hours 

D. 20 hours ANSWER: B

450. In Real case, the Charging Time for 200Ah battery would be _________ ?A. 5 hoursB. 10 hoursC. 11 hoursD. 12 hours ANSWER: D

451. One (1) Ah = ________?A. 1C B. 1200C C. 2400C D. 3600C ANSWER: D

452. The commercial lead acid cell has 13 plates. The number of positive plates would be_______.A. 6B. 7C. 8D. 9ANSWER: A

453. A lead acid cell has 15 plates. In absence of manufacturer's data [nameplate], the charging current should be________. A. 3AB. 6AC. 7AD. 13AANSWER: C

454. Volume of The Conductor is inversely proportional to the ____________.A. Voltage (V)B. Half of the Voltage (½ V) C. Squire of the Voltage (V2)D. None of the aboveANSWER: C

455. In a DC Circuit, Inductive reactance would be_________A. Equal As in AC CircuitsB. HighC. Extremely HighD. ZeroANSWER: D

456. In DC Circuits, We can improve the Circuit power factor by Capacitors.A. TrueB. False ANSWER: B

457. The rating of Alternator / Generator may be expressed in ___________A. kWB. kVAC. kVARD. HP.ANSWER: B

458. In case of Inductive circuit, Frequency is ___________Proportional to the inductance (L) or inductive reactance (XL). A. Directly B. Inversely C. No Effect ANSWER: A

459. In case of Inductive circuit, Frequency is ___________ Proportional to the Current.A. DirectlyB. InverselyC. No EffectANSWER: B

460. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________?

A. IncreasesB. DecreasesC. Remain SameD. None of the aboveANSWER: B

461. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current  ________?

A.   Also IncreasesB.   DecreasesC.   Remain SameD.   None of the aboveANSWER: B

462. In case of Capacitive circuit, Frequency is ___________Proportional to the Capacitance (C) or Capacitive reactance (XC). 

A. Directly B. Inversely C. No Effect

ANSWER: B

463. In case of Capacitive circuit, Frequency is ___________ Proportional to the Current. A. DirectlyB. InverselyC. No EffectANSWER: A

464. In case of Capacitive circuit, Capacitance (C) is ___________ Proportional to the Capacitive reactance (XC).A. DirectlyB. InverselyC. No EffectANSWER: B

465. In a Capacitive circuit, when Capacitance (C) increases, ( the circuit current also increases), then the circuit power factor ________?A. IncreasesB. DecreasesC. Remain Same D. None of the above ANSWER: A

466. In a Capacitive circuit, when Capacitive reactance increases, then the circuit power factor ________? A.   IncreasesB.   DecreasesC.   Remain SameD.   None of the aboveANSWER: B

467. If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be__________.A. InfiniteB. MaximumC. NormalD. MinimumE. ZeroANSWER: E

468. In pure inductive circuit, the power is __________?A. InfiniteB. MaximumC. NormalD. MinimumE. Zero

ANSWER: E

469. In pure capacitive circuit, the power is __________?A. InfiniteB. MaximumC. NormalD. MinimumE. ZeroANSWER: E

470. If Power factor = Cos θ = 1, it means that _____________.A. Input = Output B. PIN = POUT

C. The circuit is resistive onlyD. The  angle (θ) between Voltage and Current is Zero. ANSWER: D

471. Using P=VI Cos φ Formula, We Can Find_______.A. Power of Single phase Circuit.B. Voltage of Single Phase CircuitC. Current of Single phase Circuit.D. Power Factor of Single Phase CircuitE. All of the aboveF. None of the above ANSWER: E

472. Reciprocal of Power Factor = _________? A. Q FactorB. Demand FactorC. Diversity FactorD. Utilization FactorANSWER: A

473. Power Factor (Cos θ) =_________? A. kW/kVA B. R/Z C. The Cosine of angle between Current and voltage D. All of the above ANSWER: D

474. The relationship between Impedance (Z) and Admittance(Y) is ___________ ?A. Z=1/Y B. Z=1+Y C. Z=1-Y D. Z=Y2 ANSWER: A

475. Power in a Three Phase Circuit = _________.A. P = 3 VPh IPh CosФB. P = √3 VL IL CosФC. Both 1 & 2.D. None of The AboveANSWER: C

476. What is The Basic Three Electrical Quantities. A. Resistance, Capacitance, InductanceB. Power, Voltage, Conductance C. Voltage, Current, Resistance(Impedance)D. Current , Reluctance, InductanceANSWER: C

477. The output of an OR gate is LOW when ________.A. all inputs are LOW.B. any input is LOWC. any input is HIGHD. all inputs are HIGH.ANSWER: A

478. The voltage levels for a negative logic systemA. must necessarily be negative

B. could be negative or positiveC. must necessarily be positiveD. must necessarily be either zero or —5 V.

ANSWER: B

479. The output Qn of a J-K flip-flop is zero. It changes to 1 when a clock pulse is applied. The inputs Jn and Kn are respectively.

A. 1 and XB. 0 and XC. X and 0D. X and 1.ANSWER: A

480. The larger the RAM of a computer, the faster is its speed, since it eliminatesA. need for ROMB. need for external memoryC. frequency disk I/O sD. need for a data-wide pathANSWER: C

481. DB, DW and DD directives are used to place data in particular location or to simply allocate space without preassigning anything to space. The DW and DD directories are used to generate

A. offsetsB. full address of variablesC. full address of labelsD. offsets of full address of labels and variablesANSWER: D

482. The number of bits needed to address 4K memory isA. 6

B. 8C. 12D. 16ANSWER: C

483. The ESC instruction of 8086 may have two formats. In one of the formats, no memory operand is used. Under this format, the number of external op-codes (for the co-processor) which can be specified is?

A. 64B. 128C. 256D. 512ANSWER: B

484. The TRAP is one of the interrupts available its INTEL 8085. Which one of the following statements is true of TRAP?

A. It is level triggeredB. It is negative edge triggeredC. It is positive edge triggeredD. It is both positive edge triggered and level triggered.\ANSWER: D

485. The total number of Boolean functions which can be realized with your variablesIs ?

A. 4B. 16C. 256D. 65,536ANSWER: B

486. The maximum propagation value in case of 7400 NAND gates isA. 1 secondB. 20 milli seconds

C. less than 20 nano secondsD. less than 20 pico seconds.ANSWER: C

487. Which of the following sets represents a universal logic family?A. NANDB. XORC. NADD. None of the aboveANSWER: A

488. How many bits does one need to encode all twenty-six letters, ten symbols, and tennumerals?

A. 5B. 6C. 7D. 46ANSWER: B

489. The main advantage of flip-flops over transistor circuit isA. immunity from noiseB. low heatingC. low propagation delay timeD. high propagation.ANSWER: C

490. How many 1 are present in the binary representation of 15 x 256 + 5 x 16 + 3?A. 8B. 9C. 10D. 11ANSWER: A

491. Which of the following combinations of gates does not allow the implementation of an arbitrary Boolean function?

A. OR gates and inverters onlyB. NAND gates onlyC. OR gates and exclusive – OR gates onlyD. OR gates and NAND gates.ANSWER: D

492. Which logic circuit is the fastest?A. TTLB. DTLC. RTLD. All have same speed.

ANSWER: A

493. A half adder hasA. 2 inputs and 2 outputsB. 2 inputs and 3 outputsC. 3 inputs and 3 outputsD. None of the above.ANSWER: A

494. A decade counter requiresA. 10 flip-flopsB. 4 flip-flopsC. 3 flip-flopsD. 2 flip-flops.ANSWER: D

495. The decimal value for the BCD coded number 00010010 isA. 6B. 10C. 2D. 8.ANSWER: C

496. The Boolean expression (A+C÷D) (B+D+C) may be simplified asA. AB + CBB. AB+C+÷DC. A+BC+DD. A+B+CD.ANSWER: B

497. An adder takes……. Input/s and produces………. Output/sA. one, twoB. two, twoC. three, twoD. two, three.ANSWER: C

498. Why is it important to maintain an impedance match from the source to the load when sending signals?

A. to reduce external noise B. to keep the line balanced C. to reduce reflected energy D. to reduce attenuation ANSWER: C

499. There is no voltage measured across R4. Which if the following component failures is the most probable cause?

A. R4 open B. R5 shorted C. R2 open D. R3 shorted ANSWER: B

500. All other factors remaining the same, what is the effect of increasing wire gauge, for example, from AWG 22 to AWG 26?

A. Impedance will decrease. B. Resistance will increase. C. Inductance will decrease. D. Capacitance will increase. ANSWER: B