### 6A78 - If capacitors of 3, 5, and 7 microfarad are connected in parallel, what is the total capacitance?

A.9 microfarad

B.15 microfarad

C.10 microfarad

D.3 microfarad

A.9 microfarad

B.15 microfarad

C.10 microfarad

D.3 microfarad

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B.12

A.10

C.14

D.16

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D.All of the above

A.There will be an decrease of induction

B.There will be a decrease of Q

C.There will be overheating with possible burnout

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A.The inductance varies approximately as the square of the number of turns

B.The inductance varies approximately as the square root of the number of turns

C.Both A & B

D.None of the above

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C.Both A & B

A.f = 1/(2 pi times the square root of LC)

B.f = 0.159/(the square root of LC)

D.None of the above

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D.All of the above

A.Wavelength = 300,000/ f kHz

B.Wavelength = 300,000,000/ f Hz

C.Wavelength = 300/ f MHz

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A.300 M

B.3000 M

C.30 M

D.70 cm

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B.The ratio of the useful power output to the power input

A.The ratio of the power input to the power output

C.The ratio of the minimum power output to the maximum power output

D.None of the above

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D.B & C

A.Infinite total reactance

B.Zero total reactance

C.Parallel impedance is resistive and infinite

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A.Equal to the product of the two inductances divided by their sum

B.The sum of the individual inductances

C.Zero

D.None of the above

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D.All of the above

A.The two reactances cancel being equal and opposite

B.Net impedance is purely resistive and contains no reactive component

C.The total reactance is zero at the resonant frequency

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A.The sum of the individual inductances

B.The product of the individual inductances divided by their sum

C.Infinite

D.None of the above

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C.A and B

A.The distance a wave will travel in the time for one cycle

B.Centimeter wavelength = 30,000 / frequency MHz

D.Neither A or B

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A.Causes the current to lag the applied voltage by 90 degrees

B.Causes the current to lead the applied voltage by 90 degrees

C.Causes the current to lag the applied voltage by 45 degrees

D.Causes the current to lead the applied voltage by 45 degrees

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D.Index of cooperation (IOC), and revolutions per minute (RPM)

A.Lines-per-inch (LPI), and primary scan direction (PSD)

B.Frequency shift (FS), and phase response pattern (PRP)

C.Black-mode signal (BMS), and frequency jitter tolerance (FJT)

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A.Solely intended for distress and safety communications

B.Built and sold after the GMDSS implementation date

C.Built and sold before the GMDSS implementation date

D.Solely intended for ship-to-shore public correspondence

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D.Any of the above

A.Approx 67 volts for a normal balanced system with no faults

B.0 VAC for a system with that phase faulted to ground

C.120 VAC when another phase is faulted to ground

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D.Any combination of the above

A.Lightning arresters and suppressors

B.Protection diodes on receiver input

C.Capacitive coupling and static dissipative circuits

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B.Permits a physically short antenna to appear electrically longer

A.Provides aerodynamic compensation for stress during high winds

C.Improves the near-field radiated pattern at the expense of the far-field pattern

D.Prevents salt build-up on antennas from shunting RF energy to ground

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B.Modulation must be reduced to zero to eliminate sidebands

A.Antenna must be grounded to suppress spurious side-lobes

C.Voltage to the PA must be kept at half-value

D.Antenna current must be reduced to about 2.5 uA

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