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DC CIRCUITS > PART 2 > Flashcards

PART 2 Flashcards

1
Q

ECE Board Exam November 2001

The new and preferred term for conductance or mho

A. Siemens

B. She-man

C. Seaman

D. ROM

A

C

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2
Q

ECE Board Exam April 2001

Represents the current flow produced by one volt working across one ohm of resistance.

A. resistance

B. ampere

C. voltage

D. electromotive force

A

B

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3
Q

ECE Board Exam November 1995

When an atom gains an additional _____, it results to a negative ion.

A. atom

B. neutron

C. proton

D. electron

A

D

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4
Q

ECE Board Exam November 1999

The definite discrete amount of energy required to move an electron from a lower shell to higher shell.

A. quantum

B. positive energy

C. negative energy

D. quanta

A

D

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5
Q

ECE Board Exam November 1999

What will happen to an atom if an electron is either taken out or taken into the same atom?

A. becomes a negative ion

B. becomes an ion

C. becomes a positive ion

D. nothing will happen

A

B

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6
Q

ECE Board Exam April 1999

The energy in an electron that is called the energy of motion

A. electromotive force

B. kinematics

C. kinetic energy

D. potential energy

A

C

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7
Q

ECE Board Exam November 1996

Electric charge of neutron is the same as ______.

A. atom

B. electron

C. current

D. proton

A

A

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8
Q

ECE Board Exam April 1998

Ion is _____.

A. free electron

B. nucleus without protons

C. proton

D. an atom with unbalanced charges

A

D

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9
Q

ECE Board Exam November 1997

An insulating element or material has capability of _____.

A. storing voltage

B. preventing short circuit between two conducting wires

C. conducting large current

D. storing high current

A

B

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10
Q

ECE Board Exam April 1998

What is the value of a resistor with colors from left: Orange, Blue, Gold and Silver?

A. 34 ohms + /-10%

B. 36 ohms +/-10%

C. 3.4 ohms +/-10%

D. 3.6 0hms +/-10%

A

D

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11
Q

ECE Board Exam April 2001

A three-terminal resistor with one or more sliding contacts which functions as an adjustable voltage divider

A. Rheostat

B. Bleeder resistor

C. Potentiometer

D. Voltage divider

A

C

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12
Q

ECE Board Exam November 2000

A resistor which is used to draw a fixed amount of current

A. potentiometer

B. bleeder resistor

C. fixed resistor

D. rheostat

A

B

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13
Q

ECE Board Exam November 1996

Electric energy refers to ______.

A. Joules divided by time

B. Volt-ampere

C. Watt

D. Volt-coulomb

A

D

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14
Q

ECE Board Exam April 2001

What is the resistance of an open fuse circuit?

A. at least 1000 ohms

B. infinity

C. zero

D. 100 ohms at standard temperature

A

B

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15
Q

ECE Board Exam April 1998

When should a fuse be replaced with a higher rated unit?

A. when the fuse of the original value is small in size

B. when the original is not available

C. never

D. if it blows

A

C

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16
Q

ECE Board Exam November 2000

The ability to do work

A. energy

B. kinetic

C. potential

D. voltage

A

A

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17
Q

ECE Board Exam November 2001

Which type of variable resistor should you use for controlling large amount of current?

A. Potentiometer

B. Adjustable wirewound

C. Variac

D. Rheostat

A

B

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18
Q

ECE Board Exam April 2000

What does the fourth loop of an electronic resistor color code represent?

A. Multiplier

B. Temperature

C. First digit of the equivalent value

D. Tolerance

A

D

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19
Q

ECE Board Exam November 2000

Ten micro-microfarads is equivalent to _____

A. 100 picofarads

B. 100 nanofarad

C. 1000 milli microfarad

D. 10.0 picofarads

A

B

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20
Q

ECE Board Exam November 1995

How much is the resistance of a germanium slag 10 cm long and cross sectional area of 1 square cm?

A. 55 k ohms

B. 5.5 k ohms

C. 550 k ohms

D. 550 ohms

A

D

21
Q

ECE Board Exam November 2001

A variable resistor normally used as a voltage divider

A. Carbon film resistor

B. Potentiometer

C. Adjustable resistor

D. Metal film resistor

A

B

22
Q

ECE Board Exam April 2001

Determine the equivalent horse power of 2.611 kilowatts.

A. 3.50 hp

B. 2.50 hp

C. 2.25 hp

D. 1.50 hp

A

A

23
Q

ECE Board Exam November 2000

Find the lowest resistance value of the following resistors.

A. White, black, black

B. Violet, gray, yellow, silver

C. Red, black, gold

D. Gray, gray, black

A

C

24
Q

ECE Board Exam November 1998

If the bands on a resistor are yellow, violet, red and gold, what is the resistance value?

A. 470 ohms 5%

B. 470 ohms 10%

C. 47000 ohms 5%

D. 4700 ohms 5%

A

D

25
Q

ECE Board Exam November 1997

Rust in electrical (wire) connections will result to _____

A. Conductance

B. Resistance

C. Voltage

D. Inductance

A

B

26
Q

ECE Board Exam November 1996

The area of a conductor whose diameter is 0.001 inch is equal to

A. One micron

B. One angstrom

C. One circular mil

D. One steradian

A

C

27
Q

ECE Board Exam November 1995

_____ is the term used to express the amount of electrical energy in an electrostatic field.

A. Joule

B. Coulomb

C. Volt

D. Watt

A

A

28
Q

ECE Board Exam November 1995

Which of the following statement is correct?

A. Potentiometer has two terminals

B. Transistor has two terminals

C. Typical power rating of a carbon-composition resistor ranged from 0.125 W to 2 W

D. Open resistor has small resistance

A

C

29
Q

ECE Board Exam November 1996

_____ is one factor that does not affect resistance.

A. Resistivity

B. Cross sectional area

C. Length

D. Mass

A

D

30
Q

ECE Board Exam November 1998

What is the value of a resistor having the following colored bands: Yellow-Gray-Red-Silver?

A. 4800 ohms ±10%

B. 480 ohms ±10%

C. 3800 ohms ±1%

D. 4.8 ohms ±1%

A

A

31
Q

ECE Board Exam November 1997

Find the value of resistor with the following color codes; Brown, White, Orange, Red

A. 190 ohms 10%

B. 19 k ohms 2%

C. 1.9 k ohms 10%

D. 19 k ohms 20%

A

D

32
Q

ECE Board Exam November 1998

Resistor with colored bands in the body

A. Adjustable resistor

B. Wire-wound resistor

C. Variable resistor

D. Carbon composition resistor

A

D

33
Q

ECE Board Exam November 1998

If the bands on a resistor are red, red, orange and silver, what is the resistance value?

A. 220 ohms 5%

B. 223 0hms 10%

C. 22,000 ohms 10%

D. 2200 ohms 20%

A

C

34
Q

ECE Board Exam November 1997

What does the second strip of an electronic resistor color code represent?

A. Tolerance

B. Second digit of the value

C. Temperature

D. Multiplier

A

B

35
Q

ECE Board Exam November 2000

The energy in an electron that is called the energy of position

A. Kinetic energy

B. Kinematics

C. Electromotive force

D. Potential energy

A

D

36
Q

ECE Board Exam April 1999

If an electronic resistor does not have the fourth color strip it means it has a tolerance of _____.

A. 5%

B. 20%

C. 10%

D. 1%

A

B

37
Q

ECE Board Exam April 1998

What happens to the resistance of a conductor wire when its temperature is lowered?

A. Decreased

B. Steady

C. Zero

D. Increased

A

A

38
Q

ECE Board Exam April 1998

Which of the following does not refer to electric energy?

A. Joule

B. Watt second

C. Volt coulomb

D. Volt ampere

A

D

39
Q

ECE Board Exam March 1996

Which of the following statement is incorrect?

A. open transistor has three (3) terminals

B. transistors have three (3) terminals

C. typical power rating of carbon-composition resistor ranged 0.001 W to 0.1 W

D. potentiometer has three (3) terminals

A

C

40
Q

ECE Board Exam November 1997

Term used in electronic measuring device when a metal increases resistance due to heat produced by current flowing through them.

A. positive resistance coefficient

B. positive temperature coefficient

C. negative temperature coefficient

D. negative resistance coefficient

A

B

41
Q

A 1 km cable consists of 12 identical strands of aluminum each 3 mm in diameter. What is the resistance of the cable?

A. 0.34 ohm

B. 0.54 ohm

C. 0.44 ohm

D. 0.24 ohm

A

A

42
Q

A piece of wire has a resistance of 0.5 ohm. The length is doubled and the area is increased four times. What is its resistance?

A. 0.75 ohm

B. 0.50 ohm

C. 0.25 ohm

D. 1 ohm

A

C

43
Q

Copper wire of certain length and resistance is drawn out to four times its length without change in volume. What is the resistance of the bar?

A. unchanged

B. R/16

C. 16R

D. 4R

A

C

44
Q

Current is simply _____.

A. Flow of electrons

B. Flow of protons

C. Radiation

D. Emission

A

A

45
Q

The resistance of a coil of wire is 1 kΩ at 20°C. If the coil is immersed into oil, the resistance falls to 880 Ω. If the wire has a temperature coefficient of 0.006 at 20°C, how much is the temperature of the liquid?

A. 0°C

B. -20°C

C. 17.6°C

D. none of these

A

A

46
Q

The copper field coils of a motor was measured at 21°C and found to have a resistance of 68 Ω. After the motor has run for a given time, the resistance is found to be 96 Ω. What is the hot temperature of the winding?

A. 106.36°C

B. 166.30°C

C. 103.66°C

D. none of these

A

D

47
Q

A wire has a resistance of 30 Ω at 20°C. What will its resistance be at 60°C? Assume the temperature coefficient of resistance to be 0.000385 at 20°C.

A. 34.26 Ω

B. 36.42 Ω

C. 32.46 Ω

D. none of these

A

D

48
Q

Determine the length of a copper wire (ρ = 10.37 Ω- CM/ft) where diameter is 0.30 inch and resistance of 0.5 Ω at 20°C.

A. 4,339 ft.

B. 5.225 ft.

C. 6,125 ft.

D. none of these

A

A

49
Q

An electric water heater has a rating of 1 kW, 230 V. The coil used as the heating element is 10 m long and has a resistivity of 1.724 x 10-6 ohm-cm. Determine the required diameter of the wire in mils.

A. 2.43 mils

B. 2.52 mils

C. 3.21 mils

D. 1.35 mils

A

B

DC CIRCUITS (2 decks)

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