Electronics 10% Flashcards by Jason Davern

Two capacitors, each rated at 220 µF, are connected in parallel. The capacitance of the combination will be:

220µF
240µF
110µF
440µF

440µF

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Two capacitors, each rated at 15 µF, are connected in series. The capacitance of the combination will be:

30µF
15µF
75µF
7.5µF

7.5µF

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The fourth band of a four band resistor is marked in silver. This indicates a tolerance of:

25%
10%
20%
5%

10%

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The third band of a four band resistor is marked in black. This indicates multiplier of:

10
1
100
1000

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Two resistors, each measuring 15 Ω, are connected in series. The resistance of the combination will be:

30Ω
3Ω
15Ω
7.5Ω

30Ω

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Two resistors, each measuring 220 Ω, are connected in parallel. The resistance of the combination will be:

220Ω
240Ω
110Ω
440Ω

110Ω

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Resistor A is marked with the following colored bands: Red, Red, Red, Gold. The value of the resistor will be:

222 Ω 5%
2.2 kΩ 5%
22.2 kΩ 5%
333 Ω 5%

2.2 kΩ 5%

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A battery of 24 V is connected across an unknown resistance. If a current of 0.5 A is supplied, which one of the following gives the value of the resistor?

6 Ω
48 Ω
12 Ω
24 Ω

48 Ω

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An alternating current has a frequency of 2 kHz. Which one of the following gives the time for one complete cycle?

0.5 ms
1 ms
5 ms
2 ms

0.5 ms

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The symbol used to denote charge in an electrical circuit is:

V
E
Q
C

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In a purely inductive circuit:

voltage leads current by 90°
voltage and current are in phase (0°)
current leads voltage by 90°
voltage lags current by 45°

voltage leads current by 90°

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After which time constant can a capacitor be considered to be fully charged?

fifth
third
first
seventh

fifth

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As a capacitor is being charged, current flowing into the capacitor will:

cannot tell
increase
remain the same
decrease

decrease

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The electrical energy consumed by a coil is stored in the form of:

an electrical field
an electrostatic field
a magnetic field
a force field

a magnetic field

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When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:

center-tapped secondary
multiple winding secondary
multiple-tapped secondary
single winding secondary

center-tapped secondary

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Two inductors, each rated at 6.8 mH, are connected in parallel. The inductance of the combination will be:

16.8 mH
3.4 mH
6.8 mH
13.6 mH

3.4 mH

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A loss-free transformer has 1200 primary turns and 300 secondary turns. If the primary winding is connected to a 200 V AC supply which one of the following gives the secondary voltage:

800 V
100 V
200 V
50 V

50 V

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Two inductors, each rated at 22 mH, are connected in series. The inductance of the combination will be:

11 mH
22 mH
33 mH
44 mH

44 mH

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In a purely capacitive circuit:

voltage leads current by 90°
voltage lags current by 45°
voltage and current are in phase (0°)
current leads voltage by 90°

current leads voltage by 90°
ICE

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In an RLC circuit, Z represents:

Inductive reactance
Total impedence
Total resistance
Capacitive reactance

Total impedence

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Under normal conditions a diode conducts current when it is:

reverse-biased
saturated
avalanched
forward-biased

forward-biased

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The arrow on a schematic symbol for a diode points to the:

direction of electron flow
cathode
Anode
ground

cathode

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An N-type semiconductor material:

is intrinsic.
has pentavalent impurity atoms added.
has trivalent impurity atoms added.
requires no doping.

has pentavalent impurity atoms added.
(known as doping)

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An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward-biased.

short, short
open, open
short, open
open, short

open, short

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The term bias in electronics usually means: the value of DC voltages for the device to operate properly. the status of the diode. the condition of current through a PN junction. the value of AC voltage in the signal.

the value of DC voltages for the device to operate properly.

The collector current in a bipolar junction transistor is 2 mA when the base current is 0.1 mA. Which one of the following gives the emitter current? 1.9 mA 20 mA 0.7 mA 2.1 mA

2.1 mA

In normal (conducting) operation, the voltage that will appear between the base and emitter of an NPN bipolar junction transistor will be approximately: 1.05 V 0.65 V 0.25 V 0.15 V

0.65 V (Base/emitter voltage drop)

Which one of the following gives the relationship between the three currents flowing in an NPN bipolar junction transistor? IC = IB + IE IB = IE + IC IE = IB + IC

IE = IB + IC (Emitter current = Base current + Collector current)

The three terminals of a bipolar junction transistor are known as: Emitter, base, collector Source, gate, drain Drain, base, collector Emitter, gate, collector

Emitter, base, collector

In a semiconductor diode, the depletion region is removed when: The diode is in its reverse non-conducting state The cathode is more positive than the anode The diode is in its forward conducting state There is no potential difference between the anode and cathode

The diode is in its forward conducting state

The primary function of the bias circuit is to:

hold the circuit stable at the designed Q-point(operating point)

When a conductor interacts with a magnetic field, the induced current sets up a magnetic field that opposes the interaction. This is known as

Lenz's Law

If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

7 000=0 everything else would have a 1 so results in a 1 output

The output of an exclusive-OR gate is HIGH if: -the inputs are unequal -all inputs are LOW -none are correct -all inputs are HIGH

-the inputs are unequal

What does the small bubble on the output of the NAND gate logic symbol mean? -The output is the arithmetic sum of the inputs -The output is inverted -The output is the absolute value of the inputs -None are correct

-The output is inverted

The output of a NOR gate is HIGH if: -all inputs are HIGH -any input is LOW -all inputs are LOW -any input is HIGH

-all inputs are LOW

The Boolean expression for a 3-input AND gate is: X = A · B · C X = A + B + C X = A - B - C X = A ⊕ B ⊕ C

X = A · B · C

A 2-input NAND gate output will be LOW if the inputs are: 00 10 01 11

11 00=1 10=1 01=1 11=0

Which of the following logical operations is represented by the + sign in Boolean algebra? AND OR inversion complementation

The output of an OR gate with three inputs, A, B, and C, is LOW when: A = 1, B = 1, C = 1 A = 0, B = 1, C = 1 A = 0, B = 0, C = 1 A = 0, B = 0, C = 0

A = 0, B = 0, C = 0

A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a: DMM frequency counter logic analyzer spectrum analyzer

logic analyzer

The output of an AND gate with three inputs, A, B, and C, is HIGH when: A = 1, B = 1, C = 0 A = 1, B = 0, C = 1 A = 1, B = 1, C = 1 A = 0, B = 0, C = 0

A = 1, B = 1, C = 1 All inputs High

What would the inputs have to be on a 3 input OR gate to get a low out? A. All low B. All high C. 2 lows 1 high D. 2 high 1 low

A. ALL LOW

Solve this binary equation. Answer in a decimal number form. 11011+1111= A. 42 B. 54 C. 15 D. 101010

A. 42

A few capacitors are in parallel. Calculate the total capacitance. The capacitor values are1uF, 2uF, 3uF, and 4uF. The total capacitance is: A. 10 uF B. 5 uF C. 1 uF D. 01 uF

A. 10 uF Use same method as resistors in series . 1µF + 2µF + 3µF + 4µF = 10µF

If a 4AH battery were replaced with a 2 AH with the same voltage rating, what would the result be? A. Shorter run time. B. Longer run time C. Same run time D. It would overheat the charging circuit

A. A SHORTER RUN TIME

A Nicad battery normally has: A. 1.3 V per cell B. 1.2 V per cell C. 1.5 V per cell D. 1.0 V per cell

B. 1.2 V per cell Nickel-cadmium cells have a nominal cell potential of 1.2 volts (V).

10 to the minus 6 power is the prefix for which of the following? A. Milli B. Mega C. Micro D. Pico

C. MICRO

Which of the following is defined as volatile memory? A. ROM B. Flash C. Stable D. RAM

D. RAM a. ROM non-volatile memory include read-only memory b. Flash Flash memory is a non-volatile computer storage chip that can be electrically erasedand reprogrammed. c. Stable d. RAM The most widely used form of primary storage today is a volatile form of random access memory (RAM), meaning that when the computer is shut down, anything contained in RAM is lost.

Which of the following is the objective of a band-pass filter? A. Allow a range of frequencies between an upper and lower cutoff point to pass through. B. Allow a range of frequencies below a upper cutoff frequency to pass through. C. Allow a range of frequencies above a lower cutoff frequency to pass through. D. Allow a range of frequencies above an upper cutoff frequency and below a lower cutofffrequency to pass through.

A. Allow a range of frequencies between an upper and lower cutoff point to pass through.

In order for a basic power supply to operate correctly, which of the following is true? A. The transformer must follow the regulator. B. The rectifier must follow the filter. C. The rectifier must follow the transformer. D. The regulator must be before the filter.

C. The rectifier must follow the transformer.

Calculate the total inductance of two 40mH inductors in parallel. A. 20 mH B. 80 mH C. 40 mH D. 60mH

A. 20 mH

Calculate the total resistance of these resistors in parallel. 100 ohm, 3K ohm, 10K ohm. A. 14100 ohms B. 13100 ohms C. 95 ohms D. 100 ohms

C. 95 ohms

A few capacitors are in parallel. Calculate the total capacitance. The capacitor values are1uF, 2uF, 3uF, and 4uF. The total capacitance is: A. 10 uF B. 5 uF C. 1 uF D. 01 uF

A. 10 uF Use same method as resistors in series . 1µF + 2µF + 3µF + 4µF = 10µF

Which of the following is best determined by using an oscilloscope? A. The relationship between AC and DC in a circuit. B. The amount of AC current in a circuit. C. The amplitude of a DC signal. D. The voltage dropped across a resistor.

A. The relationship between AC and DC in a circuit.

Which of the following occurs when batteries are connected in series? A. The current capability increases. B. The voltage provided will increase. C. The smaller battery will explode. D. The voltage provided will decrease.

b. The voltage provided will increase. Connecting batteries in series increases voltage

A. Allow a range of frequencies between an upper and lower cutoff point to pass through.

The decimal number 255 is equivalent to which of the following Hexadecimal numbers? A. AA B. 100 C. FF D. FA

C. FF 255/15=15 remainder 15 In Hex 15 is F, Therefore 255 in Hex is FF

Which of the following is the unit of measure for capacitance? A. Henrys B. Farads C. Working volts D. Coulombs

B. FARADS

Which of the following is the equivalent resistance of two 20 Ohm resistors in parallel in series with a 10 Ohm resistor? A. 30 Ohms B. 15 Ohms C. 50 Ohms D. 20 Ohm

D. 20 OHMS Parallel: 1/((1/20)+(1/20)) = 10 Ohms Add 10 Ohms from above with the 10 Ohm series resistor answer is 20 Ohms

A heating element uses 90 Watts of power and has a resistance of 1kΩ. Calculate the current through the heating element. A. 0.09 milliamps B. 0.300 milliamps C. 300 milliamps D. 9 milliamps

C. 300 milliamps Power = I² X R B. 90W = I² X 1KΩ (90/1000) = I² .09 = I² .3 = I

Convert this number to decimal 4AF. A. 1200 B. 1199 C. 1015 D. 1315

B. 1199 (4*16^2)+(A*16^1)+(F*16^0) =(4*256)+(10*16)+(15*1) =1024+160+15=1199

An Oscilloscope reads 10 volts peak to peak. What is the RMS voltage? A. 707 VRMS B. 7.07 VRMS C. 3.54 VRMS D. 1.414 VRMS

C. 3.54 VRMS Peak Voltage X .707 = RMS voltage 5V X .707 = 3.54 VRMS

A Triac is used to switch: A. DC power B. AC power C. AC or DC power D. FET gate current

B. AC power the TRIAC a very convenient switch for AC circuits

A transformer has 1968 primary windings and 492 secondary windings (4:1) and the input current is 1 amp. Output current is? A. 250 mA B. 4 A C. 500 mA D. 2 A

B. 4 A (Np/N/s) = (Ep/Es) = (Ip/Is) (4/1) = (1/x) cross multiply 4=x

An isolation transformer is a transformer with: a. primary and secondary windings physically separated b. multiple secondary windings c. an earth ground on the secondary windings d. an earth ground on the primary winding

a. primary and secondary windings physically separated

Two coils are said to have mutual inductance when they are linked by: a. a series wiring connection b. a capacitor c. an inductor d. a common magnetic field

d. a common magnetic field

The unit of inductance is the: a. ohm b. rem c. farad d. Henry

d. Henry

A device to change one form of energy into another form of energy, eg. Mechanical to electrical, is called? a. capacitor b. transformer c. transducer d. transistor

c. transducer

If a technician measures a short or zero resistance across a capacitor on a circuit board and the reading doesn’t change, the technician should: a. Measure the capacitor again b. Verify continuity of the test leads c. Replace the circuit board capacitor d. Lift one leg of the capacitor and measure again

d. Lift one leg of the capacitor and measure again. Just like measuring a resistor on a ckt board

46. Which of the following best describes the sum of the voltage drops in a series resistor circuit? a. Equals the applied voltage b. Is less than the smallest voltage drop c. Is usually more than the applied voltage d. Is greater than the RMS value of all the voltage drops

a. Equals the applied voltage

65. A battery has an open circuit voltage of 22 Volts connected to a load resistance of 200Ω, at 100ma. The internal resistance of the battery is ? a. 2Ω b. 20Ω c. 220Ω d. 2,200Ω

b. 20Ω E ------ I | R 200 x .100 = 20V 22V-20V =2V 2V/100mA = 20hms

What is the inductive reactance of a 10mH coil at 400Hz a. 1.26Ω b. 2.51Ω c. 12.6Ω d. 25.1Ω

d. 25.1Ω XL=2πfL 2*3.14*400*.010=25.1

For screen film mammography, KVp is normally adjusted in increments of a. 1kVp b. 2kVp c. 4kVp d. 5kVp

a. 1kVp

If an ohmmeter test shows that a diode has an extremely high resistance In each direction, what is the condition of the diode a. Open b. Shorted c. Conducting d. Good

a. Open

The number FF in hex represents a. An invalid number b. 128 decimal c. 255 decimal d. 258 decimal

C. 255 F=15 in Hex, Hex is based on 16 base FF= 15* 16(1) + 15 *16(0) 15*16=240 15* 16(0) =15 240+15=255

When using a DMM’s diode function test, a standard silicon PNP transistor, the collector to emitter should show a. An open in one direction and a short in the other b. An open in both directions c. A short in both directions d. A 0.7 volt reading

An open in both directions

What is the binary equivalent of the hex number B5?? a. 01011011 b. 10000111 c. 10110101 d. 11000011

C 10110101 B=1011, 5=0101 so binary of B5 is 10110101

Name the three elements of a MOSFET a. Gate, source, and drain b. Emitter, base, and collector c. Base 1, base 2, and collector d. Substrate, source, and collector

a. Gate, source, and drain

Which of the following transistor configurations has the lowest voltage gain? a. Common Base b. Common Emitter c. Darlingtion pair d. Common collector

a. Common Base Voltage applied to E-B junction while output is taken from C-B junction which offers lowest voltage gain of 3 most common transistor configs ->Common Emitter, Common Base, Common Collector.

If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following: 19.5:1 3:1 180:1 1:19.5

1:19.5

When a 60Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is: 30 Hz 0 Hz 60 Hz 120 Hz

60 Hz

If the current in a wire doubles, the induced magnetic field: Remains the same Quadruples Doubles Is reduced by half

Doubles

The usual operating region of transistors in digital circuits is: Linear Region Cutoff and Saturation Region Active Region Breakdown Region

Cutoff and Saturation Region

Avalanche in diode occurs at: Breakdown voltage Barrier potential Knee voltage Depletion layer

Breakdown voltage

The DC Current Gain of a Transistor is: Ratio of Base Current to Emitter Current Ratio of Collector Current to Base Current Ratio of Base Current to Collector Current Ratio of Emitter Current to Collector Current

Ratio of Collector Current to Base Current

The secondary of a current transformer must never be ____________ while energized. Examined Shortened Grounded Opened

Opened

Under normal conditions a diode conducts current when it is: reverse-biased saturated avalanched forward-biased

forward-biased

The wide end arrow on a schematic indicates the ________ of a diode. anode ground direction of electron flow Cathode

anode

An n-type semiconductor material: is intrinsic. has trivalent impurity atoms added. has pentavalent impurity atoms added. requires no doping.

has pentavalent impurity atoms added.

An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward- biased. open, open short, open short, short open, short

open, short

The term bias in electronics usually means: the status of the diode. the value of ac voltage in the signal. the condition of current through a PN junction. the value of dc voltages for the device to operate properly.

the value of dc voltages for the device to operate properly.

As a capacitor is being charged, current flowing into the capacitor will: increase remain the same decrease cannot tell

decrease

The electrical energy consumed by a coil is stored in the form of: a magnetic field a force field an electrostatic field an electrical field

a magnetic field

What type of device consists of a coil with a moveable iron core? relay armature solenoid reed switch

solenoid

In a purely inductive circuit: voltage lags current by 90° current leads voltage by 90° voltage and current are in phase (0°) voltage leads current by 90°

voltage leads current by 90° Remember ELI

A TRIAC: cannot be triggered with gate voltages can be triggered by either a positive or a negative gate voltage can trigger only on positive gate voltages can trigger only on negative gate voltages

can be triggered by either a positive or a negative gate voltage

What does a hall effect sensor sense? temperature magnetic fields moisture pressure

magnetic fields

What causes the piezoelectric effect? heat or dissimilar metals a magnetic field pressure on a crystal water running on iron

pressure on a crystal

Junction Field Effect Transistors (JFET) contain how many diodes? 2 1 3 4

A varistor is: a variable diode a current-dependent resistor a voltage-dependent resistor a variable resistor

a voltage-dependent resistor

What circuit activity may shift a characteristic curve so that diode operating points are different? higher power (heat) higher resistance lower current lower voltag

higher power (heat)

When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, a diode is considered to be: not working reverse biased an open switch forward biased

forward biased

A capacitor that produces an AC ground is called a(n): ac open coupling capacitor bypass capacitor dc open

bypass capacitor

Shunting the AC component away from the load is the task of a: filter regulator transformer rectifier

filter

A PN junction allows current flow when: the p-type material is more positive than the n-type material the n-type material is more positive than the p-type material both the n-type and p-type materials have the same potential there is no potential on the n-type or p-type materials

the p-type material is more positive than the n-type material

In a transistor, __________ . IC = IE + IB IE = IC + IB IB = IC + IE IE = IC - IB

IE = IC + IB

When a diode is forward biased, the voltage across it: is inversely proportional to the current is directly proportional to the source voltage is directly proportional to the current remains approximately the same

remains approximately the same

In a transistor, the base current is about _____ of the emitter current. 5% 20% 35% 25%

At the base-emitter junctions of a transistor, one finds __________ . a reverse bias a wide depletion layer none of the above low resistance

low resistance

The most commonly used transistor arrangement is __________ arrangement. Common collector Common base Common emitter Cascade

Common emitter

The input impedance of a transistor is __________ . Low Very High Almost Zero High

Low

The output of an AND gate with three inputs, A, B, and C, is HIGH when ________. A = 0, B = 0, C = 0 A = 1, B = 1, C = 1 A = 1, B = 1, C = 0 A = 1, B = 0, C = 1 .

A = 1, B = 1, C = 1

If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output? 7 2 8 1

If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n): AND NAND OR NOR

NAND

A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a: DMM logic analyzer spectrum analyzer frequency counter

frequency counter

The output of an OR gate with three inputs, A, B, and C, is LOW when ________. A = 0, B = 1, C = 1 A = 1, B = 1, C = 1 A = 0, B = 0, C = 1 A = 0, B = 0, C = 0

A = 0, B = 0, C = 0

Which of the following logical operations is represented by the + sign in Boolean algebra? OR AND complementation inversion

Output will be a LOW for any case when one or more inputs are zero for a(n): OR gate NOT gate AND gate NOR gate

AND gate

The Boolean expression for a 3-input AND gate is ________ . = A · B · C = A ⊕ B ⊕ C = A + B + C = A - B - C

= A · B · C

How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH? all four inputs any two of the inputs any three of the inputs any one of the inputs

all four inputs

The output of an exclusive-OR gate is HIGH if ________ . all inputs are HIGH all inputs are LOW the inputs are unequal none are correct

the inputs are unequal

If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output? 8 1 2 7

A voltmeter is used: In series with the circuit To measure coulombs To measure current In parallel with the circuit

In parallel with the circuit

An atom's atomic number is determined by the number of: Neutrons minus protons Protons Electrons Neutrons

Protons

Electricity may be generated by a wire? That has neutral domains Passing through a flux field Wrapped as a coil Carrying current

Passing through a flux field

A series circuit current: Varies through each component Remains the same through each component Is subtracted by each component Is the same as the individual resistances

Remains the same through each component

Most older types of paper capacitors have been replaced by which type of construction? Electrolytic Oxide casing Waxed paper Plastic film

Electrolytic

The component that produces power in an electromagnetic generator is called the: Brush Armature Field winding Commutator

Armature As armature rotates, produces electrical power through electromagnetic induction.

In a power supply diagram, which block indicates a pulsating DC output? Filter Regulator Transformer Rectifier

Rectifier

A single transistor can be used to build which of the following digital logic gates? OR gates NAND gates NOT gates AND gates

NOT gates

What is the difference between binary coding and binary coded decimal? Binary coding has a decimal format Binary coding is pure binary BCD has no decimal format BCD is pure binary

Binary coding is pure binary

A data conversion system may be used to interface a digital computer system to An analog output device A digital input device A digital output device A digital printer

An analog output device

A Junction Field Effect Transistor (JFET) has a low input resistance is always forward-biased is a current-controlled device is a voltage-controlled device

is a voltage-controlled device

Which of the following memories uses a MOSFET and a capacitor as its memory cell? DROM SRAM ROM DRAM

DRAM

Which device would best aid in shorted track detection? Current Tracer Oscilloscope Logic Pulser Multimeter

Current Tracer

A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates? AND or NOR gates XOR or XNOR gates NOR or NAND gates AND or OR gates

NOR or NAND gates

What is the peak value of a household appliance that uses a 120 VAC source? 112 V 170 V 230 V 115 V

170 V

What type of register would shift a complete binary number in one bit at a time and shift all the stored bits out one bit at a time? SISO PISO PIPO SIPO

SISO

With Ohm's law, if voltage increases and resistance stays the same: Current Increases Current remains the same Resistance Decreases Power Decreases

Current Increases

The first step to getting output from a laser is to excite an active medium. What is this process called? Raising Priming Exciting Pumping

Pumping

What happens to current and resistance if the voltage doubles? Current doubles and resistance remains the same. Current doubles and resistance is halved. Current remains the same and resistance doubles. Current doubles and resistance doubles.

Current doubles and resistance remains the same.

What is the reactance value for a capacitor installed in a DC circuit? Cannot tell Infinite Moderate Zero

Infinite

Which of the following logical operations is represented by the + sign in Boolean algebra? Inversion Complementation OR AND

OR + FYI: AND *

The color of light that you see is related to The frequency of an electromagnetic wave The amplitude of just a magnetic wave The amplitude of just an electric wave The frequency of just a magnetic wave

The frequency of an electromagnetic wave

Which digital system translates coded characters into a more intelligible form? Counter Decoder Display Encode

Decoder

What do we call atoms of the same element that have different neutron numbers? Iions Compounds Isotope Elements

Isotope

The inductive reactance of a transformer depends on Electromotive Force Magnetic Flux Leakage Flux Magnetomotive Force

Electromotive Force

A Digital to Analog converter is an application of the Adjustable Bandwidth Circuit Non Inverting Amplifier Scaling adder Voltage to Current Converter

Non Inverting Amplifier

How fast does a radio wave travel through a vacuum? Its speed increases as the frequency increases At the speed of light At the speed of sound Its speed is inversely proportional to its wavelength

At the speed of light

Plasma is: -a gaseous medium -a state of matter that is similar to gas, but the atomic particles are charged rather than neutral. -a nearly incompressible fluid that conforms to the shape of its container but retains a constant volume independent of pressure. -a medium dominated by helium

a state of matter that is similar to gas, but the atomic particles are charged rather than neutral.

The bridge used for measurement of inductance is? Kelvin Double Bridge Schering Bridge Anderson Bridge Wheatstone Bridge

Anderson Bridge

Current through the ionized gas in gas tube: Usually assumes infinity Usually fluctuates Usually remains constant Usually assumes zero value

Usually fluctuates

The frequency of audible sound for humans lies between: 15 KHz -> 1 MHz 1 MHz -> 15 MHz None of these are correct 0.5Hz -> 20 KHz

0.5Hz -> 20 KHz

Which of the following is the fastest switching device? JFET MOSFET Triode BJT

MOSFET

What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio? Mixer Product detector Phase inverter Discriminator

Discriminator

What segments of the 7-segment LED display need to be energized to make the number 9? a, b, d, f and g b, c, d, e and g a, b, e, f and g a, b, c, f and g

a, b, c, f and g

The function of the starter for a DC motor is: To increase field resistance To limit the starting voltage To limit the starting current To reduce armature resistance

To limit the starting current

The speed of sound in air depends on: Period of the wave Air temperature Frequency of the sound Wavelength of the wave

Air temperature

In serial digital data communications, what must be added to the data? Just parity bit Only start and stop bits Start, stop and parity bit for error detection and correction Some error-detection and error-correction scheme

Start, stop and parity bit for error detection and correction

Which is not a transverse wave? Waves in water Sound Vibration of a guitar string X-Rays

Sound

Testing a good diode with an ohmmeter should indicate?

high resistance when reverse biased and low resistance when forward biased

The output of an OR gate with three inputs, A, B, and C, is LOW when ________

A = 0, B = 0, C = 0

The component that produces power in an electromagnetic generator is called the:

Armature