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Test 1 Practice Problems on Comprehensive Electrical Engineering | EE 2950, Exams of Electrical and Electronics Engineering

Louisiana State University (LSU) - System OfficeElectrical and Electronics Engineering
Prof. M. Rabalais

Material Type: Exam; Professor: Rabalais; Class: COMPREHENSIVE E E; Subject: Electrical Engineering; University: Louisiana State University; Term: Spring 2012;

Typology: Exams

2011/2012

Uploaded on 09/21/2012

sabrams2373
sabrams2373 đŸ‡ș🇾

3 documents

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a.!
2Ω!resistor!opened!
b.!!!!shorted!
c.*!!!!opened!
d.!!!!shorted!
e.!!!!opened!
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EE!2950!Test!1!Spring!2012!!!DO#NOT#MARK#ANSWERS#ON#TEST.##USE#Scantron!#
March!5,!2012!
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1.!The!power!absorbed!by!a!resistance!can!be!expressed!as:!
a.*!!"
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2.!!In!the!circuit!shown!below,!!!!through!!!!represent!indicator!lamps!on!a!control!panel.!!If!!!!suddenly!
becomes!brighter,!which!of!the!following!would!be!the!most!likely!cause?!
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3.!A!battery!(an!ideal!independent!voltage!source)!is!connected!to!a!small!lamp!of!resistance!R.!!If!a!small,!
identical!lamp!is!connected!in!series!with!the!first,!what!will!happen!to!the!current!supplied!by!the!battery?!
a.!it!will!increase!!!b.*!it!will!decrease!!!c.!it!will!remain!the!same!!!d.!it!will!be!zero!!!e.!it!will!double!
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4.!It!is!your!first!day!on!the!job!and!you!are!asked!to!determine!what!is!wrong!with!the!circuit!that!is!
powering!a!motor!that!is!malfunctioning!on!a!piece!of!manufacturing!equipment;!millions!of!dollars!are!at!
stake.!!You!deSenergize!the!circuit!and!use!the!circuit!schematic!diagram!that!is!shown!below!to!trouble!
shoot!the!circuit!with!an!ohmSmeter!and!find!that!there!is!twice!as!much!resistance!measured!across!the!
motor!compared!to!what!the!manual!states.!!Which!of!the!following!component!failures!is!the!most!
probable!cause!of!the!problem?!!
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a.!!!!is!shorted!
b.!!!!is!shorted!
c.*!!!!is!opened!
d.!!!!is!opened!
e.!!!!is!shorted!
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5.!Determine!the!resistance!of!a!load!which!draws!400!mA!of!current!when!connected!to!a!12.6!V!battery?!
a.*!31.5Ω!!!b.!9.5Ω!!!c.!9.5!Ω!!!d.!150Ω!!!e.!105Ω!
!
+!
S!
2Ω!
16V!
+!
S!
48!!
pf3
pf4
pf5

Partial preview of the text

Download Test 1 Practice Problems on Comprehensive Electrical Engineering | EE 2950 and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

a. 2 Ω resistor opened

b. !! shorted

c.* !! opened d. !! shorted e. !! opened !! !! !! !! !! motor

EE 2950 Test 1 Spring 2012 DO NOT MARK ANSWERS ON TEST. USE Scantron!

March 5, 2012

  1. The power absorbed by a resistance can be expressed as: a.* !" !" !" !" b.^ !" !" !" !" c.^ !" !" !" !" d.^ !" !" !" !" e. none of these
  2. In the circuit shown below, !! through !! represent indicator lamps on a control panel. If !! suddenly becomes brighter, which of the following would be the most likely cause?
  3. A battery (an ideal independent voltage source) is connected to a small lamp of resistance R. If a small, identical lamp is connected in series with the first, what will happen to the current supplied by the battery? a. it will increase b.* it will decrease c. it will remain the same d. it will be zero e. it will double
  4. It is your first day on the job and you are asked to determine what is wrong with the circuit that is powering a motor that is malfunctioning on a piece of manufacturing equipment; millions of dollars are at stake. You de-­‐energize the circuit and use the circuit schematic diagram that is shown below to trouble shoot the circuit with an ohm-­‐meter and find that there is twice as much resistance measured across the motor compared to what the manual states. Which of the following component failures is the most probable cause of the problem?

a. !! is shorted

b. !! is shorted

c.* !! is opened

d. !! is opened

e. !! is shorted

  1. Determine the resistance of a load which draws 400 mA of current when connected to a 12.6 V battery? a.* 31. 5 Ω b. 9. 5 Ω c. 9. 5 !Ω d. 150 Ω e. 105 Ω

2 Ω 16 V

6. A node is defined as a point of connection between

a. two separate power supplies b. at least three branches c. *two or more circuit elements d. two capacitors e. two inductors

  1. Calculate the equivalent resistance, !!", in the circuit below.
  2. Use loop/mesh analysis to determine the power supplied or absorbed by the 25 volt source.

10 Ω 20 Ω 25 Ω 1 Ω a.* 31 Ω b. 104 Ω c. 17 Ω d. 43 Ω e. 23 Ω 12 Ω

25! 2 Ω 15! 1 Ω 5 Ω 2 Ω a. 44 W absorbed b. 100 W supplied c. 275 W absorbed d. 312 W absorbed e.* 234 W supplied

-­‐^ !!

  1. If a resistor absorbs 15 Watts of power for two hours, how much energy is converted to heat? a. 50 J b. 200 J c. 2000 J d. 30,000 J e.* 108,000 J

14. Given the configuration below, determine whether the source is supplying or absorbing power.

  1. The circuit shown below models a car battery with two headlights (represented by the resistors). Determine the energy provided by the battery if the lights remain on for three hours. a. 100kJ b.*130kJ c. 219kJ d. 103kJ e. 203k

16. In the circuit below, if you applied Thevenin’s Theorem to determine !!, what value would you

determine for the Thevenin voltage, !!!?

15V 3 Ω 6 Ω 3 Ω 5 Ω 3 A

V! = 20!

a.* absorbing b. supplying

I

12V -­‐

6 Ω 6 Ω

a. 23!

b. 19!

c. 35!

d.* 42!

e. 51!

-­‐^ !!

  1. In the circuit below, use Thevenin’s Theorem to determine !!.
  2. The ideal independent current source pictured below has a. no voltage across it b. has a voltage across it, but it cannot be determined c. has 6 volts across it d. has 15 volts across it e.* has 9 volts across it
  3. Use nodal analysis to determine the node voltage V.

V 5 Ω

15V 3 Ω 6 Ω 3 Ω 5 Ω 3 A

a.* 10. 5!

b. 4. 13!

c. 12. 2!

d. 6. 91!

e. 5. 45!

3 A 5 Ω 7. 5 Ω

a. − 21!

b. 11!

c.* − 3. 6! d. 6. 3! e. − 13. 3!