# MCQ in DC Circuits Part 8 | REE Board Exam

(Last Updated On: November 13, 2020) This is the Multiple Choice Questions Part 8 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 8 of the Series

ELECTRIC CELLS

Choose the letter of the best answer in each questions.

351. ECE Board Exam November 1995

When the cells are in series voltages add, while current capacity is _______.

A. The same as one cell

B. Zero

C. Infinite

D. The sum of each cell

Solution:

352. ECE Board Exam April 1999

Refers to an action in the operation of secondary cells reforming the electrodes in a chemical reaction where dc voltage is supplied externally.

A. Polarizing cells

B. Charging cells

C. Aligning cells

D. Discharging cells

Solution:

353. ECE Board Exam November 1999

What type of cell that cannot be recharged which cannot restore chemical reaction?

A. Primary cell

B. Secondary cell

Solution:

354. ECE Board Exam November 2000

An ordinary flashlight battery is which of the following?

B. A dry cell

C. A storage cell

D. A wet cell

Solution:

355. ECE Board Exam April 1998

Refers to dry storage cell carbon zinc.

A. cell

B. Edison cell

C. Mercury cell

Solution:

356. ECE Board Exam April 1998

What is the other term of the secondary cells considering its capability to accept recharging?

A. Reaction cell

B. Primary cell

C. Storage cell

D. Dry cell

Solution:

357. ECE Board Exam November 1996

Find the required battery capacity needed to operate an equipment of 30 amperes at 5 hours.

A. 6

B. 30

C. 3

D. 150

Solution:

358. ECE Board Exam March 1996

When batteries have cells connected in series the effect is

A. Reduced output voltage

B. Increased current supply

C. Increased voltage supply

D. Reduced internal resistance

Solution:

359. ECE Board Exam November 2000

Find the required battery capacity needed to operate on electronic equipment with power rating of 200 watts and 10 volts at 6 hours.

A. 60

B. 1200

C. 20

D. 120

Solution:

360. ECE Board Exam November 2000

A cell(s) that can be operated or used in a horizontal, vertical or any position where its electrolyte cannot be spilled in any position

A. Primary cells

B. Secondary cells

C. Dry cells

D. Battery

Solution:

361. ECE Board Exam April 1999

It is an indication of the current supplying capability of the battery for a specific period of time, e.g. 400 ampere-hour.

A. Rating

B. Capacity

C. Capability

Solution:

362. ECE Board Exam March 1996

Which of the following is not a secondary type cell?

A. Lithium

D. Silver-zinc

Solution:

363. ECE Board Exam March 1996

How many lithium cells in series are needed for a 12 V battery?

A. 12 cells

B. 4 cells

C. 8 cells

D. 10 cells

Solution:

364. ECE Board Exam November 1996

Component of solar battery which uses light energy to produce electromagnetic force

A. Alkaline cell

B. Polymer cell

C. Lithium cell

D. Selenium cell

Solution:

365. ECE Board Exam March 1996

If a dry cell has an internal resistance of 0.50 ohm and emf of 2 volts, find power delivered in a one ohm resistor.

A. 1.33 watts

B. 1.66 watts

C. 3.66 watts

D. 1.77 watts

Solution:

366. ECE Board Exam March 1996

Parallel cells have the same voltage as one cell but have _____.

A. Unstable resistance

B. Less current capability

C. Fluctuating power output

D. More current capacity

Solution:

367. ECE Board Exam April 1999

A battery with capacity of 100 Ah and 12 volts rating will run an electronic equipment at exactly 20 hours, how much power is needed?

A. 60 watts

B. 20 watts

C. 10 watts

D. 30 watts

Solution:

368. ECE Board Exam March 1996

It is the output voltage of a carbon-zinc cell.

A. 3.5 V

B. 2.5 V

C. 1.5 V

D. 0.5 V

Solution:

369. ECE Board Exam March 1996

What is the reason why more cells can be stored in a given area with dynamic cells?

A. They consume less power

B. They are smaller

C. They are larger

D. They travel faster

Solution:

370. ECE Board Exam November 1997

A radio equipment will be used at 70% at 50 amperes rating for 5 hours. How much capacity of dry battery is needed?

A. 35

B. 17.5

C. 250

D. 175

Solution:

371. The potential at the terminals of the battery falls from 9 V on open circuit to 6 volts when a resistor of 10 ohms is connected across its terminals. What is the internal resistance of the battery?

A. 5 Ω

B. 4 Ω

C. 3 Ω

D. 2 Ω

Solution:

372. A battery is formed of five cells joined in series. When the external resistance is 4 ohms, the current is 1.5 A and when the external resistance is 9 ohms, the current falls to 0.75 A. Find the internal resistance of each cell.

A. 0.5 ohm

B. 1.0 ohm

C. 0.2 ohm

D. 0.3 ohm

Solution:

373. A 12 V source with 0.05 Ω resistance is connected in series with another 12 volt with 0.075 Ω resistance with a load of 2 Ω. Calculate the power dissipated in the load.

A. 365 watts

B. 127 watts

C. 105 watts

D. 255 watts

Solution:

374. A 24 V source with 0.05 Ω resistance is connected in parallel with another 24 V with 0.075 Ω resistance to a load of 2 Ω. Calculate the current delivered by the source with a 0.05 Ω resistor.

A. 7 amperes

B. 10 amperes

C. 5 amperes

D. 12 amperes

Solution:

375. A battery can deliver 10 joules of energy to move 5 coulombs of charge. What is the potential difference between the terminals of the battery?

A. 2 V

B. 50 V

C. 0.5 V

D. 5 V

Solution:

376. An ordinary dry cell can deliver about ____ continuously.

A. 3 A

B. 2 A

C. 1/8 A

D. none of these

Solution:

377. Cells are connected in series when ____ is required.

A. high voltage

B. high current

C. high voltage as well as high current

D. none of these

Solution:

378. Cells are connected in series–parallel when ____ is required.

A. high current

B. high voltage

C. high current as well a high voltage

D. none of these

Solution:

379. Four cells, each of internal resistance 1 ohm, are connected in parallel. The battery resistance will be ____.

A. 4 ohms

B. 0.25 ohm

C. 2 ohms

D. 1 ohm

Solution:

380. The e.m.f. of a cell depends upon ____.

A. nature of electrodes and electrolyte

B. size of electrodes

C. spacing between electrodes

D. none of these

Solution:

381. In order to get maximum current in series – parallel grouping, the external resistance should be ____ the total internal resistance of the battery.

A. less than

B. more than

C. equal to

D. none of these

Solution:

382. The positive terminal of a 6-V battery is connected to the negative terminal of a 12-V battery whose positive terminal is grounded. The potential at the negative terminal of the 6V battery is ____ volt.

A. +18

B. –12

C. -6

D. -18

Solution:

383. The positive terminal of a 6-V battery is connected to the negative terminal of a 12-V battery whose positive terminal is grounded. The potential at the positive terminal of the 6-V battery is ____ volt.

A. +6

B. -6

C. -12

D. +12

Solution:

384. Active materials of a lead-acid cell are

C. dilute sulfuric acid

D. all of these

Solution:

385. During the charging of lead-acid cell

A. its cathode becomes dark chocolate brown in colour

B. its voltage increases

C. it gives out energy

D. specific gravity of H2SO4 is decreased

Solution:

386. The ratio of Ah efficiency to Wh efficiency of a leadacid cell is

A. always less than one

B. just one

C. always greater than one

D. either A or B

Solution:

387. The capacity of a cell is measured in

A. watt-hours

B. watts

C. amperes

D. ampere-hours

Solution:

388. The capacity of a lead-acid cell does NOT depend on its

A. rate of charge

B. rate of discharge

C. temperature

D. quantity of active materials

Solution:

389. As compared to constant-current system, the constant-voltage system of charging a lead-acid cell has the advantage of

A. avoiding excessive gassing

B. reducing time of charging

C. increasing cell capacity

D. both B and C

Solution:

390. Sulphation in a lead-acid battery occurs due to

A. trickle charging

B. incomplete charging

C. heavy discharging

D. fast charging

Solution:

391. The active materials of a nickel-iron battery are

A. nickel hydroxide

B. powdered iron and its oxides

C. 21% solution of caustic potash

D. all of these

Solution:

392. During charging and discharging of a nickel-iron cell

A. its e.m.f. remains constant

B. water is neither formed nor absorbed

C. corrosive fumes are produced

D. nickel hydroxide remains unsplit

Solution:

393. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

A. lower e.m.f.

B. smaller quantity of electrolyte used

C. higher internal resistance

D. compactness

Solution:

394. Trickle charging of a storage battery helps to

A. prevent sulphation

B. keep it fresh and fully charged

C. maintain proper electrolyte level

D. increase its reserve capacity

Solution:

395. A dead storage battery can be revived by

A. a dose of H2SO4

D. none of these

Solution:

396. The sediment which accumulates at the bottom of a lead-acid battery consist largely of

D. graphite

Solution:

397. The reduction of battery capacity at high rates of discharge is primarily due to

A. increase in its internal resistance

B. decrease in its terminal voltage

C. rapid formation of PbSO4 on the plates

D. non-diffusion of acid to the inside active materials

Solution:

398. Floating battery system are widely used for

A. power stations

B. emergency lighting

C. telephone exchange installation

D. all of these

Solution:

399. Any charge given to the battery when taken off the vehicle is called

A. bench charge

B. step charge

C. float charge

D. trickle charge

Solution:

400. Storage battery electrolyte is formed by the dissolving of ____ acid in water.

A. hydrochloric

B. sulfuric

C. acetic

D. atric

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

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