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# MCQ in DC Circuits Part 7 | REE Board Exam

This is the Multiple Choice Questions Part 7 of the Series in DC Circuits as one of the Electrical Engineering topic. In Preparation for the REE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electrical Engineering field, Electrical Engineering Books, Journals and other Electrical Engineering References.

#### Continue Practice Exam Test Questions Part 7 of the Series

ELECTRICAL AND HEAT ENERGY

Choose the letter of the best answer in each questions.

301.ย  Forย  aย  givenย  lineย  voltage,ย  fourย  heatingย  coilsย  will produce maximum heat when connected

A.ย  all in parallel

B.ย  all in series

C.ย  with two parallel pairs in series

D.ย  one pair in parallel with the other two in series

Solution:

302.ย  Fourย  heatersย  havingย  theย  sameย  voltageย  ratingย  will produce maximum heat if connected in

A.ย  Series

B.ย  Parallel

C.ย  Series-Parallel

D.ย ย  Parallel-Series

Solution:

303.ย  1000 kW is equal to how many is ergs/sec.

A.ย  2 x 1013

B.ย  1 x 1016

C.ย  1 x 1013

D.ย  2 x 1010

Solution:

304.ย  When current flows through heater coil, it glows but supply wiring does not glow because

A.ย  supply wiring is covered with insulation wiring

B.ย  currentย  throughย  supplyย  lineย  flowsย  atย  slower speed

C.ย  supply wires are made of superior material

D.ย  resistanceย  ofย  heaterย  coilย  isย  moreย  thanย  thatย  of supply wire

Solution:

ELECTRIC CELLS

305.ย  REE Board Exam October 1997

A load of 10 ohms was connected to a 12-volt battery. The current drawn was 1.18 amperes. What is the internal resistance of the battery?

A.ย  0.35 ohm

B.ย  0.20 ohm

C.ย ย  0.25 ohm

D.ย  0.30 ohm

Solution:

306.ย  REE Board Exam April 1997

Theย  electromotiveย  forceย  ofย  aย  standardย  cellย  is measured with a potentiometer that gives a reading ofย  1.3562ย  V.ย  Whenย  aย  1.0ย  megaohmย  resistorย  is connectedย  acrossย  theย  standardย  cellย  terminals,ย  the potentiometerย  readingย  dropsย  toย  1.3560ย  V,ย  whatย  is the internal resistance of the standard cell?

A.ย  174.5 ohms

B.ย  145.7 ohms

C.ย  147.5 ohms

D.ย  157.4 ohms

Solution:

307.ย  REE Board Exam April 1997

Ifย  aย  resistorย  ratedย  atย  5ย  wattsย  andย  6ย  voltsย  are connectedย  acrossย  aย  batteryย  withย  anย  openย  circuit voltage of 6 volts. What is the internal resistance of the battery if the resulting current is 0.8 A?

A.ย  0.30 ohm

B.ย  0.26 ohm

C.ย  0.23 ohm

D.ย  0.03 ohm

Solution:

308.ย  REE Board Exam October 1998

A 12 V battery of 0.05-ohm resistance and another batteryย  ofย  12ย  Vย  andย  0.075ย  ohmย  resistanceย  supply powerย  toย  aย  2-ohmย  resistor.ย  Whatย  isย  theย  current through the load?

A.ย  5.85 A

B.ย  5.63 A

C.ย  5.72 A

D.ย  5.91 A

Solution:

309.ย  REE Board Exam October 1996

Theย  leadย  batteriesย  โAโย  andย  โBโย  areย  connectedย  in parallel. โAโ has an open circuit voltage of 12 V and anย  internalย  resistanceย  ofย  0.2ย  ohm.ย  Batteryย  โBโย  has anย  openย  circuitย  voltageย  ofย  12.2ย  Vย  andย  anย  internal resistanceย  ofย  0.3ย  ohm.ย  Theย  twoย  batteriesย  together deliverย  powerย  toย  aย  0.5ย  ohmย  powerย  resistor. Neglectingย  effectsย  ofย  temperature,ย  howย  much current is contributed by battery โAโ?

A.ย  29.62 A

B.ย  16.00 A

C.ย  12.85 A

D.ย  25.24 A

Solution:

310.ย  EE Board Exam October 1981

Aย  charger,ย  aย  batteryย  andย  aย  loadย  areย  connectedย  in parallel.ย  Theย  voltageย  acrossย  theย  chargerย  isย  12.5 voltsย  andย  theย  batteryย  hasย  anย  emfย  ofย  12ย  voltsย  and internal resistance of 0.1 ohm. The load consists of aย  2ย  ohmsย  resistor.ย  Findย  theย  currentย  throughย  the charger.

A.ย  6.61 A

B.ย  6.25 A

C.ย  6.42 A

D.ย  6.50 A

Solution:

311.ย  REE Board Exam October 1996

Aย  leadย  storageย  batteryย  isย  ratedย  atย  12ย  volts.ย  Ifย  the internalย  resistanceย  isย  0.01ย  ohm,ย  whatย  isย  the maximum power that can be delivered to the load?

A.ย  1,200 W

B.ย  3,600 W

C.ย  7,200 W

D.ย  1,800 W

Solution:

312.ย  EE Board Exam April 1995

A 120-V battery having an internal resistance of 0.5 ohmย  isย  connectedย  throughย  aย  lineย  resistanceย  ofย  0.5 ohmsย  toย  aย  variableย  loadย  resistor.ย  Whatย  maximum power will the battery deliver to the load resistor?

A.ย  36 watts

B.ย  63 watts

C.ย  630 watts

D.ย  360 watts

Solution:

313.ย  REE Board Exam April 2002

A 12 volts battery has a 50 ampere-hour capacity. The internal resistance is 0.1 ohm. A 5 ohm load is connectedย  forย  5ย  hours.ย  Howย  manyย  ampere-hours are still left?

A.ย  28.51

B.ย  41.24

C.ย  38.23

D.ย  35.92

Solution:

314.ย  REE Board Exam April 2002

Two-24 volt battery supply power to a 20 ohm load. Oneย  batteryย  hasย  0.2ย  ohmย  internalย  resistanceย  while theย  otherย  hasย  0.4ย  ohm.ย  What powerย  doesย  theย  load draws?

A.ย  28.4 W

B.ย  22.2 W

C.ย  30.8 W

D.ย  18.6 W

Solution:

315.ย  ECE Board Exam March 1996

Which statement is not true?

A.ย  Secondary cell can be recharged

B.ย  Theย  internalย  resistanceย  ofย  aย  cellย  limitsย  the amount of output current

C.ย  The negative terminal of a chemical cell has a charge of excess electrons

D.ย  Two electrodes of the same metal provide the highest voltage output

Solution:

316.ย  ECE Board Exam November 2001

In the operation of dry cell we normally refer to the supplyย  ofย  currentย  loadย  resistanceย  whereย  itsย  current neutralizes the separated charges at the electrodes.

A.ย  Aligning the cells

B.ย  Charging the cells

C.ย ย  Discharging the cells

D.ย  Polarizing the cells

Solution:

317.ย  ECE Board Exam November 2000

Refersย  toย  aย  powerย  sourceย  orย  cellย  whichย  canย  be rechargeable

A.ย  Battery

B.ย  Secondary

C.ย  Primary

D.ย  Storage

Solution:

318.ย  ECE Board Exam November 2001

In the operation of dry cell we normally refer to the supplyย  ofย  currentย  loadย  resistanceย  whereย  itsย  current neutralizesย  theย  separatedย  chargesย  atย  the electrodes.

A.ย  Aligning the cells

B.ย  Charging the cells

C.ย  Discharging the cells

D.ย  Polarizing the cells

Solution:

319.ย  ECE Board Exam November 2000

The part of the cell of the solution that acts upon the electrodes providing a path for electron flow

A.ย  Container

B.ย  Electrolyte

C.ย  Sealing way

D.ย  Electrolysis

Solution:

320.ย  ECE Board Exam April 1999

Type of cell used mostly for emergency equipment. It is light, small, and has a large capacity of power for its size.

A.ย  Ni-Cd cell

C.ย  Silver-zinc cell

D.ย  Mercury cell

Solution:

321.ย  ECE Board Exam March 1996

Theย  purposeย  ofย  cellsย  connectedย  inย  parallelย  is to_____.

A.ย  increase internal resistance

B.ย  increase in voltage output

C.ย  decrease current capacity

D.ย  increase in current capacity

Solution:

322.ย  ECE Board Exam November 1995

Find the output of a four (4) lead acid cells.

A.ย  3.2 V

B.ย  8.4 V

C.ย  5.8 V

D.ย  1.6 V

Solution:

323.ย  ECE Board Exam November 1997

How many silver zinc cells in series are needed for a 9 V battery?

A.ย  9

B.ย  6

C.ย  3

D.ย  7

Solution:

324.ย  ECE Board Exam November 1995

_____ is the specific gravity reading for a good lead acid cell.

A.ย  1170

B.ย  1270

C.ย  1070

D.ย  1370

Solution:

325.ย  ECE Board Exam November 1998

Refersย  toย  aย  powerย  sourceย  orย  cellย  thatย  isย  not rechargeable?

A.ย  Secondary

B.ย  Primary

C.ย  Storage

D.ย  Battery

Solution:

326.ย  ECE Board Exam April 1998

Which of the following is not a primary type cell?

A.ย  Zinc-chloride

B.ย  Silver-zinc

C.ย  Silver oxide

D.ย  Carbon zinc

Solution:

327.ย  ECE Board Exam November 1997

A battery should not be charged or discharged at a high current in order to avoid this defect.

A.ย  Corrosion

B.ย  Sedimentation

C.ย  Buckling

D.ย  Sulphation

Solution:

328.ย  ECE Board Exam April 2001

Itย  isย  aย  cellย  inย  whichย  theย  chemicalย  actionย  finally destroysย  oneย  ofย  theย  electronsย  electrodes,ย  usually the negative and cannot be recharged.

A.ย  Dry cell

B.ย  Secondary cell

C.ย  Wet cell

D.ย  Primary cell

Solution:

329.ย  ECE Board Exam November 2001

Which of the following statements is not true?

A.ย  Output of solar cell is normally 0.5 V

B.ย  Edison cell is storage type

C.ย  The Ni-Cd cell is primary type

D.ย  Primary cells can be charged

Solution:

330.ย  ECE Board Exam April 2001

Which of the following statements is not true?

A.ย  Aย  primaryย  cellย  hasย  irreversibleย  chemical reaction

B.ย  A carbon zinc cell has unlimited shelf life

C.ย  Aย  storageย  cellย  hasย  irreversibleย  chemical reaction

D.ย  A lead acid cell can be recharged

Solution:

331.ย  ECE Board Exam November 1999

Aย  deviceย  thatย  transformsย  chemicalย  energyย  into electrical energy

A.ย  Battery

B.ย  Cell

C.ย  Primary battery

D.ย  Secondary battery

Solution:

332.ย  ECE Board Exam April 1999

Whatย  isย  theย  effectย  ofย  connectingย  batteryย  cellsย  in parallel?

A.ย  Current decreases

B.ย  Voltage increases

C.ย  Voltage decreases

D.ย  Current increases

Solution:

333.ย  ECE Board Exam November 1997

Determine how long a battery will last whose rating isย  100ย  Ah,ย  24ย  voltsย  andย  willย  runย  aย  300ย  watts electronic equipment and a 50 watts light.

A.ย  6.85 hours

B.ย  50.05 hours

C.ย  26.65 hours

D.ย  12.00 hours

Solution:

334.ย  ECE Board Exam April 2001

Theย  processย  ofย  reversingย  theย  currentย  flowย  through theย  batteryย  toย  storeย  theย  batteryย  toย  itsย  original condition

A.ย  Electrolysis

B.ย  Ionization

C.ย  Reverse flow

D.ย  Battery charge

Solution:

335.ย  ECE Board Exam November 2000

The type of cell commonly referred to as โflashlight batteryโ

B.ย  Mercury cell

C.ย ย  Dry cell

Solution:

336.ย  ECE Board Exam November 1998

Howย  doesย  aย  batteryย  behaveย  whoseย  cellsย  are connected in series?

A.ย  Increase current supply

B.ย  Reduces total voltage

C.ย  Increases voltage supply

D.ย  Reduces internal resistance

Solution:

337.ย  ECE Board Exam April 1998

Anotherย  veryย  useful cell toย  solarย  cellsย  howeverย  the junctionย  isย  bombardedย  byย  betaย  particlesย  from radioactive materials

A.ย  Alkaline cells

B.ย  Nucleus cells

C.ย  Selenium cells

D.ย  Lithium cells

Solution:

338.ย  ECE Board Exam November 2001

The continuation of current flow within the cell there is no external load

A.ย  Local action

B.ย  Polarization

C.ย  Self-discharge

D.ย  Electrolysis

Solution:

339.ย  ECE Board Exam November 1998

Type of power source in electronics that cannot be recharged after it has delivered its rated capacity

A.ย  Cells

B.ย  Primary cells

C.ย  Battery

D.ย  Secondary cells

Solution:

340.ย  ECE Board Exam November 1995

Which has the largest diameter of the following dry cells?

A.ย  Type C

B.ย  Type AA

C.ย  Type AAA

D.ย  Type D

Solution:

341.ย  ECE Board Exam April 1998

Howย  manyย  nickel-cadmiumย  cellsย  areย  neededย  in series for a 10 V battery?

A.ย  8

B.ย  12

C.ย  5

D.ย  10

Solution:

342.ย  ECE Board Exam March 1996

Current in a chemical cell refers to the movement of _____.

A.ย  Negative ions only

B.ย  Negative and positive ions

C.ย  Positive ions only

D.ย  Negative hole charge

Solution:

343.ย  ECE Board Exam November 1998

Find the output of a two (2) lead acid cells.

A.ย  0.952 V

B.ย  2.1 V

C.ย  3.2 V

D.ย  4.2 V

Solution:

344.ย  ECE Board Exam November 2000

The liquid solution that forms ion charges in a lead acid battery

A.ย  Electrolyte

B.ย  Hydrochloric acid

C.ย  Sulfuric acid

D.ย  Nitric acid

Solution:

345.ย  ECE Board Exam April 1998

Singleย  deviceย  thatย  convertsย  chemicalย  energyย  into electrical energy is called

A.ย  Battery

B.ย  Generator

C.ย  Solar

D.ย  Cell

Solution:

346.ย  ECE Board Exam November 1995

There are _____ identical cells in parallel needed to double the current reading of each cells.

A.ย  3

B.ย  4

C.ย  2

D.ย  1

Solution:

347.ย  ECE Board Exam April 2001

Whatย  isย  theย  effectย  ofย  connectingย  batteryย  cellsย  in series?

A.ย  Voltage increases

B.ย  Current increases

C.ย  Voltage decreases

D.ย  Current decreases

Solution:

348.ย  ECE Board Exam November 2000

Howย  longย  canย  aย  batteryย  lastย  withย  capacityย  ofย  50 ampere-hour running equipment of 5 amperes?

A.ย  250 hours

B.ย  25 hours

C.ย ย  100 hours

D.ย  10 hours

Solution:

349.ย  ECE Board Exam April 1998

How long will a battery need to operate a 240-watt equipment, whose capacity is 100 Ah and 24 volts rating?

A.ย  10 hours

B.ย  5 hours

C.ย  1 hour

D.ย  0.10 hour

Solution:

350.ย  ECE Board Exam November 2001

Whatย  isย  affectedย  whenย  aย  leadย  batteryย  is overcharged?

A.ย  Carbon

B.ย  Grid

C.ย  Plates

D.ย  Electrolytes

Solution:

#### Questions and Answers in DC Circuits

Following is the list of practice exam test questions in this brand new series:

MCQ in DC Circuits
PART 1: MCQ from Number 1 โ 50                Answer key: included
PART 2: MCQ from Number 51 โ 100            Answer key: included
PART 3: MCQ from Number 101 โ 150           Answer key: included
PART 4: MCQ from Number 151 โ 200           Answer key: included
PART 5: MCQ from Number 201 โ 250           Answer key: included
PART 6: MCQ from Number 251 โ 300           Answer key: included
PART 7: MCQ from Number 301 โ 350           Answer key: included
PART 8: MCQ from Number 351 โ 400            Answer key: included
PART 9: MCQ from Number 401 โ 450            Answer key: included
PART 10: MCQ from Number 451 โ 500          Answer key: included

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