ELECTRONICS Flashcards by Rick Armstrong

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

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Solve this binary equation. Answer in a decimal number form. 11011+1111=

A. 42

B. 54

C. 15

D. 101010

A. 42

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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

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In a capacitive circuit:

A. Voltage leads current by 180 degrees

B. Current leads voltage by 90 degrees

C. Voltage leads current by 90 degrees

D. Current leads voltage by 180 degrees

B. Current leads voltage by 90 degrees

ELI the ICE man

Voltage/current always leads by 90 degrees

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A heating element in an infant incubator 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

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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

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Waveforms on an EEG Monitor are temporarily stored in:

A. ROM

B. RAM

C. EPROM

D. EEPROM

B. RAM

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A GFCI normally has a trip point of

A. 2 mA

B. 3 mA

C. 4 mA

D. 6 mA

D. 6 mA

NFPA 99

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The IEEE standard for Ethernet communication:

A. 802.11

B. 802.3

C. 803.11

D. 811.3

B. 802.3

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Which one of these has the longest wavelength in the light spectrum:

A. Violet Light

B. Yellowish-Green Light

C. Orange Light

D. Dark Red Light

D. Dark Red Light

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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).

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A transformer has 1968 primary windings and 492 secondary windings (4:1) and the inputcurrent 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

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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

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Convert this number to decimal 4AF.

A. 1200

B. 1199

C. 1015

D. 1315

B. 1199

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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

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What inputs would be neededon the gate above to get a low output?

A. High and high

B. Low and low

C. Low and high

D. It can’t have a low output

A. HIGH AND HIGH

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Checking a good transistor with a digital multimeter between C & E, it should read=

A. 2 shorts

B. 2 opens

C. 7V

D. Short and open

B. 2 OPENS

Calculate the total inductance of two 40mH inductors in parallel.

A. 20 mH

B. 80 mH

C. 40 mH

D. 60mH

A. 20 mH

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

What type of filter is the image above?

A. High Pass

B. Low Pass

C. Band Pass

D. Impedance matching

C. BAND PASS

If VE= 40mVolts, VC=12 Volts, VB 700 mVolts. What is the defect?

A. Open transistor base to emitter

B. Open transistor collector to emitter

C. Open transistor collector to base

D. R2 is open

C. Open transistor collector to base

If VB= .105 volts, VC= 12 volts, VE=.105 in the circuit above, what is the defect?

A. Open transistor base to emitter

B. Shorted transistor base to emitter

C. Open transistor collector to base

D. C3 is open

B. Shorted transistor base to emitter

If VB= 0.69 Volts, VE= 3 mV, VC= 3.2 V in the circuit above, what is the defect?

A. Shorted C3

B. Open collector

C. Open R1

D. Shorted R3

A. SHORTED C3

The normal output voltage at R5 is 550 mV peak. If the output voltage is only 250mV, but the DC voltages at the transistor leads are normal, what is the defect?

A. Open collector emitter of the transistor

B. Leaky C3

C. Shorted R1

D. Open C2

B. LEAKY C3

What kind of amplifier set up is this in the drawing above? ## Footnote A. Common Collector B. Common Base C. Common Emitter D. Gate follower

C. COMMON EMITTER

Which drawing is a comparator ## Footnote A. A B. B C. C D. D E. E F. F

D. D

Which one of the drawings is a voltage follower? ## Footnote A. A B. B C. C D. D E. E F. F

C.C

Which one of the drawings is a differentiator? ## Footnote A. A B. B C. C D. D E. E F. F

E.E

Which one of the drawings is a non-inverting amplifier? ## Footnote A. A B. B C. C D. D E. E F. F

B.B

Determine the output voltage of the op-amp in schematic F above, if C2 has a short. ## Footnote A. 1.5 V B. 1 V D. 0 V E. 3.7 V

C. 0 V If C2 is shorted its resistance value is zero, therefore your voltage gain equation will equal zero.

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

B. FARADS

Which of the following is the protocol that provides communication across interconnected networks? ## Footnote A. CSMA/CD B. SMTP C. TCP/IP D. Routing table

C. TCP/IP

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

D. RAM ## Footnote 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 best determined by using an oscilloscope? ## Footnote 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 is the objective of a band-pass filter? ## Footnote 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.**

Which of the following is the equivalent resistance of two 20 Ohm resistors in parallel in series with a 10 Ohm resistor? ## Footnote 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**

In order for a basic power supply to operate correctly, which of the following is true? ## Footnote 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.**

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

**C. MICRO**

Which of the following occurs when batteries are connected in series? ## Footnote 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

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

**C. FF**