6A28 - The formula for finding power in a DC circuit when current and resistance are known:

B.P = ( I Squared) R

A.P = IE

C.PF = W/IE

D.None of the above

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6A29 - The formula for finding power in a DC circuit when current and voltage are known:

A.P = EI

B.P = ( I squared ) R

C.PF = W/IE

D.None of the above

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6A30 - The prefix " kilo " means:

A.To multiply by 1000 whatever quantity follows

B.To divide by 1000 whatever quantity follows

C.To add 1000 to whatever quantity follows

D.None of the above

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6A31 - The prefix " micro " means:

A.Divide by 1,000,000 whatever quantity follows

B.Multiply by 1,000,000 whatever quantity follows

C.Add 1,000,000 to whatever quantity follows

D.Divide by 1,000 whatever quantity follows

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6A32 - The factor by which the product of volts and amperes must be multiplied to obtain true power is:

A.Power factor

B.Apparent power

C.Phase angle

D.None of the above

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6A33 - The prefix " meg " means:

A.Multiply by 1,000,000 whatever quantity follows

B.Multiply by 100,000 whatever quantity follows

C.Multiply by 1,000 whatever quantity follows

D.Divide by 1,000,000 whatever quantity follows

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6A34 - Factors which influence the resistance of a conductor:

D.All of the above

A.Cross-sectional area

B.Length

C.Temperature

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6A35 - Halving the cross-sectional area of a conductor will:

A.Double the resistance

B.Half the resistance

C.Not affect the resistance

D.None of the above

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6A36 - Name four conducting materials in order of their conductivity.

B.Silver, gold, zinc, platinum

A.Gold, silver, copper, platinum

C.Silver, copper, zinc, aluminum

D.Aluminum, zinc, copper, platinum

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6A37 - Good insulators at radio frequencies are:

D.A & B

A.Pyrex, mica

B.Isolantite, steatite, polyethylene

C.Rubber, porcelain

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6A38 - A resistance across which a constant voltage is applied is doubled. What power dissipation will result?

A.One half

B.One fourth

C.Doubled

D.None of the above

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6A39 - The needle of a magnetic compass when placed within a coil carrying an electric current:

D.A & B

A.Will tend to become parallel with the axis of the coil

B.Will point to the north pole end of the coil

C.Will point to the south pole end of the coil

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6A40 - Electrical resistance is measured with:

A.An ohmmeter

B.A wattmeter

C.An Ammeter

D.A voltmeter

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6A41 - The sum of all voltage drops around a simple DC circuit, including the source, is:

A.Zero

B.Insignificant

C.Infinite

D.None of the above

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6A42 - If a resistance to which a constant voltage is applied is halved, what power dissipation will result?

A.Doubled

B.Halved

C.Tripled

D.Same

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6A43 - The diameter of a conductor six inches long is doubled, what will be the effect on the resistance?

D.A & C

A.One-fourth the original value

B.One-half the original value

C.The resistance varies inversely with the cross-sectional area of the conductor

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6A44 - A minute subdivision of matter having the smallest known unit of negative electrical charge is:

A.Electron

B.Ion

C.Gilbert

D.Joule

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6A1 - SITOR-ARQ is a common mode of data communications in the maritime service. It is a system based on transmission bursts and acknowledgements. What is the baud, and interval between the burst transmissions:

A.100 baud, 240 ms interval

B.50 baud, 1000

C.200 baud, 10 ms interval

D.None of the above

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