Canadian Basic Qualification pool, section B-003-016

Subelement B-003

B-003

Section B-003-016

B-003-016-001

What approximate voltage does a standard automobile starter battery usually supply?

Correct Answer
A.
12 volts
B.
9 volts
C.
16 volts
D.
28 volts

B-003-016-001

The common Lead-Acid battery has a nominal voltage of 12 volts [ 12.6 to be exact ]

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-002

Which of the following has a positive terminal and a negative terminal?

A.
A resistor
B.
A potentiometer
C.
A fuse
Correct Answer
D.
A battery

B-003-016-002

Fuses, resistors and potentiometers are not 'polarized' (current can flow through them either way). The battery, however, has a positive terminal and a negative terminal.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-003

A battery, that can be repeatedly recharged by supplying it with electrical energy, is known as a:

Correct Answer
A.
storage battery
B.
memory battery
C.
low leakage battery
D.
primary battery

B-003-016-003

A battery is built with a number of cells. A 'storage cell' can be recharged repeatedly. A 'primary cell', such as a 'conventional' zinc-carbon or alkaline flashlight cell, can only be used once.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-004

Which of the following is a source of electromotive force (EMF)?

A.
Metal-film resistor
Correct Answer
B.
Lithium-ion battery
C.
P-channel FET
D.
Germanium diode

B-003-016-004

EMF = Electromotive Force, synonym for voltage. Lithium-ion batteries are common in modern portable equipment.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-005

Why is the NiMH battery often preferred over a conventional alkaline battery?

A.
It contains a liquid electrolyte
Correct Answer
B.
It can be repeatedly recharged
C.
It can be discarded without precautions
D.
It provides a higher voltage

B-003-016-005

The 'conventional' zinc-carbon or alkaline flashlight battery CANNOT be recharged, while a 'storage cell' like the NiMH battery or lithium-ion battery can be recharged numerous times.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-006

The voltage at a battery's terminals will drop when it supplies current. What is the cause of the drop?

A.
Voltage capacity
B.
Current capacity
C.
Electrolyte becoming dry
Correct Answer
D.
Internal resistance

B-003-016-006

An ideal battery would supply precisely the same voltage regardless of the current drawn. Real-life batteries exhibit 'internal resistance' which causes a drop in voltage when current is drawn. Ever noticed the headlights dim when the starter is cranked on a cold winter day ?

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-007

For portable operation, what is the primary advantage of lithium-based batteries over lead-acid batteries?

A.
Simple charging methods
Correct Answer
B.
High battery capacity per kilogram
C.
Lower voltage per cell
D.
High tolerance to overcharge

B-003-016-007

Key word: PORTABLE. The lithium battery will be lighter than a lead one for a given capacity.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-008

Battery capacity is commonly stated as a value of current delivered over a specified period of time. What is the effect of exceeding that specified current?

A.
The voltage delivered will be higher
B.
The battery will accept the subsequent charge in a shorter time
Correct Answer
C.
The battery will discharge more rapidly than specified
D.
One or more cells may become short-circuited

B-003-016-008

One important specification of rechargeable batteries is the 'capacity' expressed in milliampere-hour (or ampere-hour), a certain amount of current that can be delivered for a given period of time (typically, 20 hours). Exceeding the capacity reduces operating time, the battery is depleted more rapidly.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-009

What voltage and capacity will you achieve by connecting two 12 volts, 20 ampere-hour batteries in parallel?

A.
24 volts, 40 ampere-hours
Correct Answer
B.
12 volts, 40 ampere-hours
C.
24 volts, 20 ampere-hours
D.
6 volts, 80 ampere-hours

B-003-016-009

Key word: PARALLEL. A parallel combination of batteries will permit supplying more current at a given voltage.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-010

What voltage and capacity will you achieve by connecting two 12 volts, 20 ampere-hour batteries in series?

A.
6 volts, 80 ampere-hours
Correct Answer
B.
24 volts, 20 ampere-hours
C.
12 volts, 40 ampere-hours
D.
24 volts, 40 ampere-hours

B-003-016-010

Key word: SERIES. Adding batteries in series brings up the available voltage. However, the total current available from the string remains limited to what a single battery can supply.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-003-016-011

A lithium-ion battery should never be:

A.
left overnight at room temperature
B.
left disconnected
C.
recharged
Correct Answer
D.
short-circuited

B-003-016-011

Lithium-ion batteries have very low 'internal resistance'. Hence, they can supply potentially dangerous currents in a short-circuit.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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