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ELECS COACHING VOLUME 2 PART 1

A modern electronics lab with various components such as resistors, capacitors, circuit boards, and multimeters, vibrant colors, and an engaging atmosphere

Electronics Knowledge Quiz

Test your understanding of electronics with our comprehensive quiz designed for enthusiasts and professionals alike. Challenge yourself with 101 carefully crafted questions covering a wide range of topics.

In this quiz, you will discover:

Diodes and transistors
Capacitance and resistance
Basic electrical laws
AC and DC circuits

101 Questions25 MinutesCreated by TestingFalcon472

D-MOSFETS are sometimes used in series to construct a cascade high- frequency amplifier to Overcome the loss Of:

A. LOW output impedance

B. Capacitive reactance

C. High Input impedance

D. Inductive reactance

The term pole as it relates to switches is defined as

A. The of completely circuits isolated circuits that can be controlled by the switch

B. The number of closed contact positions that the switch has.

C. The number of connecting terminals the switch has.

D. None of the above.

What type of meter can be used to measure ac currents without breaking open the circuit?

A. An analog VOM.

B. amp-clamp probe

C. A DMM.

D. There isn’t such a meter.

Which of the following resistors has die smallest physical size?

A. wire-wound resistors.

B. carbon-composition resistors.

C. surface –mount resistors

D. potentiometers.

Which of the following is an appropriate use for a voltmeter?

A. To measure difference of potential

B. To measure current flow.

C. To determine total resistance.

D. To determine power output.

Silicon dioxide is less suited for low voltage rectifier operation because:

A. Its breakdown voltage is high.

B. Saturation current is tow.

C. Its cut-in voltage is high

D. None Of the choices

Which has more resistance, a 100-ft length of No. 12 gage copper wire or a 100-ft l

A. The 100-ft length of No.12 gage aluminum wire.

B. The 100-ft length of No. 12 gage copper wire.

C. They both have exactly the same resistance.

D. It cannot be determined.

If the distance between the plates of a capacitor decreases while all other Components of the capacitor remain the same, What happens to the Capacitance of the device?

A. Increase -

B. Remains the same

C. Decreases

D. Varies

The equivalent series resistance (ESR) of a capacitor should ideally be

A- infinite.

B. As high as possibte.-

C. around 100 kohm.

D. zero

The motion of ion charges in a liquid or gas is called.

A. The corona effect.

B. Hole flow.

C. superconductivity.

D. Ionization current

The transfer characterisbcs of a diode relates to:

A.The diode current and the input voltage

B. The diode current and the output voltage

C. The output voltage and input voltage

D. None of the choices

Which of the following determines total power in a series circuit?

A. Source voltage times current

B. Total voltage applied to the circuit

C. Current flowing through a switch

D. Average of the wattage consumed by Each resistor

Which of the following measurements is usually the most inconvenient and time- consuming when troubleshooting?

A. Resistance measurements

B, dc voltage measurements

C. Current measurement

D. Ac voltage measurements.

A constant- current source

A. Has very low internal resistance.

B. Supplies constant current to a wide range of load resistances.

C. Has very high internal resistance.

D.BothBandC.

For a junction FET in the pinch-off region. As the drain voltage is increased. The drain

A. Becomes zero

B. Abruptly decreases

C. Abruptly increases

D. Remains constant

A carbon-film resistor is color-coded with violet, black. And gold stripes. What are its resistance and tolerance?

A.27Ω±5%

B. 270 Ω ± 5%

C. 27 Ω ± 10%

D. 27Ω ± 10%

Which of the following wires has the greatest cross-sectional area?

A. 9 AWG

B. 14 AWG

C. 22 AWG

D. 30 AWG

The charge and discharge current of a Capacitor flows

A. Through the dielectric.

B. To and from the capacitor

C. Through the dielectric only until the capacitor is fully charged.

D. Straight through the dielectric from one plate to the other.

For an n-channel JFET , having drain— source voltage constant if the gate— source voltage is increased to more negative pinch-off would occur for:

A. Saturation value of drain current

B. High values of drain current

C. Zero drain current -

D. Source current equal to the drain current

The Maxwell (Mx) is a unit of

A. Flux density.

B. permeability.

C. magneticflux.

D. Field intensity.

Which of the following statements is true?

A. Resistors always have axial leads.

B. Resistors are always made from carbon

C. There is correlation between the physical size of a resistor and its resistance value

D. The shell life of a resistor is about 1 year.

When using an Ohmmeter to measure the continuity of Wire, the resistance should measure

A. about 0Ω if the Wire is good.

B. Infinity if the wire is broken (Open).

C. Very high resistance if the wire Is good.

D. BOTH A and B

If a resistor suddenly decreases in Value(resistance decreases), What will happen to the current through die resistor?

A. increases

B. Remains unchanged

C. decreases

D. fluctuates

Bipolar transistors are _______than field effect transistor.

A. Less sensitive and slower

B. More sensitive and faster

C. More sensitive and slower

D. Less sensitive and faster

Kirchhoff’s current law states that

A. The algebraic sum of the currents flowing into any point in a circuit must equal zero

B. Algebraic sum of the currents entering and leaving any in a circuit must equal zero.

C. The algebraic sum of the currents flowing away from any point in a circuit must equal zero.

D. The algebraic sum of the currents around any closed path must equal zero.

The electric or magnetic effect of One boy on other without any physical contact between them is called.

A. Its permeability.

B. induction.

C. the Hall effect.

D. hysteresis.

The internal resistance of a battery

A. Cannot be measured with an ohmmeter.

B. Can be measured with an ohmmeter.

C. Can be measured indirectly by determining how much the output voltage drops for a given load current.

D. BOTH A and C

In mutual induction, what passes between conductors in order to create voltage?

A. Radiation

B. Magnetic flux

C. Current flow

D. Resistance

An n-channel JFET has whose value is;

A. Maximum for Vgs=0, and minimum for Vgs=negative and large

B. Minimum for Vgs=0, and maximum for Vgs=negative and large

C. Maximum for Vgs=0, and minimum for Vgs=positive and large

D. Minimum vgs=0, and maximum for Vgs=positive and large

If a thermistor has a negative temperature coefficient (NTC), its resistance

A. increasesWithanincreasein operating temperature.

B. Decreases with a decrease in operating temperature.

C. Decreases with an Increase In operating temperature

D. Is unaffected by its operating temperature.

A commercial permanent magnet Will last indefinitely if it is not subjected to

A. A strong demagnetizing field.

B. Physical shock.

C. High temperatures.-

D. All of the above.

The Henry is the unit Of measurement for which Of the following properties?

A. Reactance

B. Capacitance

C. Resistance

D. Inductance

Capacitance increases with

A. Larger plate area and greater distance between the plates.

B. Smaller plate area and greater distance between the plates.

C. Larger plate area and less distance between the plates.

D. Higher values of applied voltage.

Which of these is a best description of a Zener diode?

A. It operates in the reverse region.

B. It is a constant voltage deviced. -

C. It is a constant current device.

D. None of the choices

Which of the following devices can be used to test the windings of an inductor for continuity?

A. Wattmeter

B. Voltmeter

C. Ohmmeter

D. Wheatstone bridge

For a transistor to function as an amplifier,

A. Both the EB and CB junctions must be forward-biased

B. Both the EB and CB junctions must be reversed-biased.

C. the EB junction must be forward- biased and the CB junction must be- biased.

D. the CB junction must be forward- biased and the EB junction must be reverse-biased.

The induction fitter is mostly used for rectifiers with:

A. Half-wave rectifiers - Arts.

B. Light loads

C. High Ioads

D. None of the above

If the north (N) pole of a permanent magnet is placed near a piece of soft iron, what is the polarity of the nearest induced pole?

A. South (S) pole.

B. North (N) pole.

C. It could be either a north (N) or a south (S)pole.

D. It cannot be determined.

Which of the following circuit conditions doesa metal oxide varistor (MOV) protect against?

A. High voltage

B. High current

C. High Circuit noise

D. High cross-talk

Varactor diodes are used in FM receivers to obtain:

A. Automatic frequency control

B. Automatic gain control

C. Automatic volume control

D. None of the choices

What is the classification of an AC circuit in which the capacitive reactance is 50 Ω, the inductive reactance is 30 Ω and the resistance

A. Resistive

B. Inductive

C. Capacitive

D. Resonant

Now a days in MOSFET's the material used for the gate is:

A. Heavily doped polycrystalline silicon

B. Pure silicon

C. High purity silica oxide

D. Epitaxial grown silicon

When applying Kirchhoff's current law,

A. Consider all currents flowing into a branch point positive and all currents directed away from that point negative.

B. Consider all Currents flowing into a branch point negative and all currents directed away from that point positive.

C. Remember that the total of all the Currents entering a branch point must always be greater than the sum of the Currents leaving that point.

D. The algebraic sum of the cu Tents enteringand leaving a branch point does not necessarily have to be Zero.

Which of the following circuit configurations has the same amount of voltage drop across each of its components?

A. Parallel

B. Series-parallel

C. Series

D. Combination

When a pulsating dc voltage is applied as an input to the primary of a transformer, the output from the secondary contains

A. Only the steady dc component of the input signal

B. A stepped up or down version of pulsating dc voltage.

C. Only the ac cornponent of the input signal.

D. None of the choices

A chip resistor is marked 394. Its resistance value is;

A. 39.4 Ω

B. 394 ohm

C. 390,000 Ω

D. 39,000 ohm

To a first approximation, a forward- biased diode is treated like a(n):

A. Open switch with infinite resistance.

B. Closed switch w/ a voltage drop of 0V.

C. Closed switch in series with a battery voltage of O. 7 V.

D. Closed switch in series with a small resistance and a battery.

With the four-band resistor color code, gold in the third stripe corresponds to a:

A. Fractional multiplier of 0.01.

B. Fractional multiplier of 0.1

C. Decimal multiplier of 10.

D. Resistor tolerance of ± 10%.

As temperature increases, what happens to the current-carrying ability of a Wire?

A. There is no Change

B. The wire can Carry more current

C. The Wire can carry less current

D. The wire can carry no current.

When using a standard multimeter to measure AC voltage, what type of measurement will the multimeter indicate?

A. Peak-to-peak

B. peak

C. Average

D. rms

The polarity or a resistor's voltage drop is determined by:

A. The direction of current through the resistor.

B. How large the resistance is.

C. How close the resistor is to the voltage source.

D. How far away the resistor is from the voltage source

A magnet that requires current in a coil to create the magnetic field is called a (n)

A. Permanent magnet.

B. electromagnet.

C. solenoid.

D.BothBandC

Which Of the following statements are correct for basic transistor amplifier configuration?

A. CB amplifier has low input impedance and a low current gain

B. CC amplifier has low output impedance and a low current gain

C. CE amplifier has very poor voltage gain but very high input impedance

D. The current gain of CB amplifier is higher than the current gain of CC amplifier

Kirchhoff's voltage taw states that:

A. The algebraic sum of the voltage source and IR voltage drops in any path must total zero.

B. Algebraic sum of the voltage sources and IR voltage drops around any dosed path can never equal zero.

C. The algebraic sum of all the currents flowing around any closed loop must equal zero.

D. None of the choices

What happens to current flow in a capacitive circuit when the DC voltage across the capacitor is approximately equal to the source voltage?

A. Current flow is optimized

B. Little current flows.

C. Current flow is maximum at the source.

D. Current flow is maximum at the capacitor.

In what operating region does the collector of a transistor act like a current source?

A. The active region.

B. The saturation region.

C. The cutoff region.

D. The breakdown region.

If Vm is the peak value of an applied voltage in a half-wave rectifier With a large capacitor across the load, then PIV is.

A. Vm

B. Vm/2

C. 2Vm

D. None of the choices

When a small voltage is generated across the width of a conductor carrying current in an external magnetic field, the effect is called

A. the Doppler effect.

B. the Miller effect

C. the Hall effect-

D. the Schultz effect.

Which of the following configuration ifs normally used in cascading?

A. Common-emitter configuration

B. Common-base configuration-

C. Common-collector configuration

D. None of the choices

At the same frequency, a larger capacitance provides.

A. More charge and discharge current.

B. Less charge and discharge current.

C. Less capacitive reactance, Xc

D. Both A and C

A material that becomes strongly magnetized in the same direction as the magletizing field is classified as

A. diamagnetic.

B. ferromagnetic

C. paramagnetic.

D. toroidal

The LED is usually made of materials like:

A. GaAs

B. C and Si

C. GeAs

D. None of the choices

The value of a bypass capacitor should be chosen so that its Xc value is ______.

A. one-tenth or less the parallel resistance at the lowest frequency to be bypassed.

B. 10 or more times the parallel resistance at the highest frequency to bypassed.

C. one-tenth or less the parallel resistance at the highest frequency to be bypassed.

D. Equal to the parallel resistance at the lowest frequency to be bypassed

How should a fuse be installed in a circuit to insure proper operation?

A. Parallel to the load

B. Series with the load

C. In any way possible

D. At the ground point

In the BJT amplifier, the transistor is biased in the forward active region putting a capacitor across R_E will:

A. Decrease the voltage gain and decrease the input impedance

B. Increase the voltage gain and decrease the input impedance

C. Decrease the voltage gain and increase the input impedance

D.Increase the voltage gain and increase the input impedance

On the schematic symbol of a pnp transistor, _______.

A. The arrow points out on the emitter lead.

B. The arrow points out on the collector lead.

C. The arrow points in on the base lead.

D. The arrow points in on the emitter lead.

In a parallel circuit operating with a source of 30 VAC, designed to carry a total current of 6 A, what happens to the protection device (fuse) when the resistance suddenly changes to 2 Ω?

A. Closes

B. No change

C. Shorts to ground

D. Opens

To increase the cutoff frequency of an RL high-pass filter, you can ______.

A. Decrease the value of R

B. Decrease the value of L

C. Increase the value of R

D. Decrease the value of L and increase the value of R(Both B & C)

For an enhancement-type MOSFET the output V-I characteristic of has:

A. Only an ohmic region

B. An ohmic region at low voltage value followed by a saturation region at higher voltages

C. Only a saturation region

D. An ohmic region at large voltage value followed by a saturation region at lower voltages

What should be observed when connecting a voltmeter into a DC circuit?

A. rms

B. Resistance

C. Polarity

D. Power Factor

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

If R_L is short-circuited in the figure shown below, which of the following will happen?

A. The amplifier signal output would fall to zero.

B. The collector current would fall to

C. The amplifier signal will remain the same

D. The transistor would overload

Refer to the figure below. What is the expected power level at the input to the receiver?

A. 20 dBm-

B. 30 dBm

C. 40 dBm

D. 50 dBm

The primary function of the bias circuit is to:

A. Hold the circuit stable at Vcc

B. Hold the circuit stable at Vin

C. Ensure proper gain is achieved

D. Hold the circuit stable at the designed Q-point

With an electromagnet, _______.

A. More current and more coil turns mean a stronger magnetic field

B. Less current and fewer coil turns mean a stronger magnetic field

C. If there is no current in the coil, there is no magnetic field.

D. Both A and C

The main factor, which differentiates a D-MOSFET from an E-MOSFET, in the absence of:

A. p-n junction

B. Insulated gate

C. Electrons

D. Channel

For any capacitor, ________.

A. The stored charge increase w/ more capacitor voltage

B. The charge and discharge currents are in opposite directions.

C. Ic lead Vc by 900

D. All of the choices.

A principal node is ______.

A. A close path or loop where the algebraic sum of the voltages must equal to zero

B. The simplest possible closed path around a circuit

C. A junction where branch currents can combine or divide.

D. None of the choices

Which of the following is NOT a local memory device?

A. SDRAM

B. processor ROM

C. Processor cache

D. PCI status registers

The leads of a multimeter are across a diode in the following manner: Red lead connects to the end of diode with marking band, and the black lead connects on other end. What does a reading of -0.6 volts indicate?

A. Forward bias, leads connected with proper polarity

B. Reversed bias, leads connected with proper polarity

C. Forward bias, leads connected with reverse polarity

D. Reversed bias, leads connected with reverse polarity

When applying Kirchhoff’s voltage law

A. Consider any voltage whose positive terminal is reached first as negative and any voltage whose negative terminal is reached first as positive.

B. Always consider all voltage sources as positive and all resistor voltage drops as negative

C. Consider any voltage whose negative terminal is reached first as negative and any voltage whose positive terminal is reached first as positive.

D. Always consider all resistor voltage drops as positive and all voltage source as negative

The main difference between resistance, R, and capacitive reactance, Xc, is that:

A. Xc is the same for both dc and ac. whereas R depends on frequency.

B. R is the same for both dc and ac. whereas Xc depends on frequency.

C. R is measured in ohms and Xc is measured in farads.

D. None of the choices

Which component is considered to be an "OFF" device?

A. Transistor

B. JFET

C. D-MOSFET

D. E - MOSFET

On a schematic diagram, what does the chassis ground symbol represent?

A. Hot spots on the chassis

B. The locations in the circuit where electrons accumulate

C. A common return path for current in one or more circuits.

D. None of the above

In a common emitter BJT amplifier, the maximum usable supply voltage is limited by:

A. Avalanche breakdown of base- emitter junction

B. Collector–base breakdown voltage with emitter open (BVCBO)

C. Collector–emitter breakdown voltage with base open (BVCEO)

D. Zener breakdown voltage of the emitter-base junction

Refer to the figure below. Which is the electrical symbol for a source of energy?

A.I

B.H

C.A

D.C

The left-hand rule for solenoids states that:

A. If the fingers of the left hand encircle the coil in the same thumb points in the direction of the north pole.

B. If the thumb of the left hand points in the direction of current flow, the fingers point toward the north pole

C. If the fingers of the left hand encircle the coil in the same directions as electron flow, the thumb points in the direction of the south pole

D. If the thumb of the right hand points in the direction of electron flow, the fingers point in the direction of the north pole.

Dividing line for coupling capacitor at a specific frequency can be taken as:

A. Xc 10 or more times the series resistance.

B.Xc=R

C. Xc one-tenth or less the series resistance.

D. None of the above

Which of the following statements about parallel circuits is false?

A. The voltage is the same across all branches in a parallel circuit

B. The equivalent resistance R_EQ of parallel circuits is always smaller than the smallest branch resistance

C. In a parallel circuit the total current, IT in the main line equals the sum of the individual branches currents

D. The equivalent resistance, R_EQ, of a parallel circuit decreases when one or more parallel branches are removed from the circuit.

The ends of a load line drawn on a family of curves determine:

A. Saturation and cutoff.

B. The operating point

C. The power curve

D. The amplification factor

What is the output waveform?

A. Sine wave

B. Square wave

C. Sawtooth wave

D. Triangle wave

A differential amplifier has an open- loop voltage gain of 120. The input signals are 2.45 V and 2.35 V. Calculate the output voltage of the amplifier.

A. 12.0 V

B. 11.5 V

C. 12.5 V

D. 10 V

The voltage follower has a:

A.Closed-loop voltage gain of unity

B. Small open-loop voltage gain

C. Closed-loop BW of zero

D. Large closed loop Output impedance

Introducing a resistor In the emitter or common emitter amplifier stabilizes the dc operating point against variations in:

A. Only the temperature

B. Only the β of the transistor

C. Both A and B

D. None of the choices

If one branch of a parallel circuit becomes

A. Ail remaining branch currents increase

B. The voltage across the open branch will be 0V

C. Remaining branch currents do not change in value

D. The equivalent resistance or the circuit decreases.

What is the "powerfactor"?

A. Ratio of true power to apparent power

B. Peak power times 0. 707

C. Sin of the phase difference between e and I

D. Cos Of the phase angle between true power and apparent power

Motor action always tends to produce motion

A. A stronger field toward a weaker field

B. A weaker field toward a Stronger field.

C. A north pole toward a south pole.

D. None of the choices

Determine me common-mode gain of an op amp that has a differential voltage gain of 150x103 and a CMRR of 90 dB.

A 1.74

B. 2.74

C. 3.74

D. 4.74

For a relay, the pickup current is defined as

A. The maximum current rating of the relay coil.

B. The minimum relay coil current required to keep a relay energized.

C. The minimum relay coil Current required to energize a relay.

D. The minimum in the switching contacts.

Using the method of mesh currents, any resistance common of two meshes has:

A. Two opposing mesh currents.

B. One common mesh current.

C. Zero current

D. None of the above.

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