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Academic Quotes

The first problem for all of us, men and women, is not to learn, but to unlearn - Gloria Steinem

The act of unlearning is an excellent form of learning. Infact, you will need the skills of unlearning if you intend to become an expert in your desired field.

Do yourself a favor by unlearning, learning and re-learning on a daily basis

If you don't design your own life plan, chances are you'll fall into someone else's plan. And guess what they have planned for you? Not much - Jim Rohn

There's something special about you. It doesn't matter whether you work for a company or someone; what matters is the amount of investment you've made on yourself.

Investing in yourself is the best life plan you can design for your future

Smile - Len Academy

Peace begins with a smile - Mother Teresa

Never underestimate the power of your smile. It can lift up the depressed, improve the mood of the downtrodden and even discourage a suicidal attack. Also remember that your smile makes you more beautiful

Smile always for your own good and the good of others

The only person who is educated is the one who has learned how to learn …and change - Carl Rogers

To perfect your learning process, you must learn, unlearn and re-learn. Infact, we all need to learn how to unlearn those vices we know about ourselves.

Do you know that seeing the devastating consequences of vices (perhaps in movies or real-life) can initiate the unlearning processes in one who does such?

Start where you are. Use what you have. Do what you can - Arthur Ashe

Start now. You've got all it takes to achieve greatness, so no environment can limit you. Just begin something, give in your best and don't stop.

Remember, don't stop giving your best if you truly desire greatness. Nothing can stop you except yourself


A thin continuous line is used for representing the followings except _____.

  • A. Intersections

  • B. Hatching lines

  • C. Long breaks

  • D. Diagonal line used to state plane surfaces

  • E. Leader lines

  • F. Back section lines

ANSWER: Long breaks

A Thin Continuous Line is used for representing the followings:

  • Projection lines

  • Hatching lines

  • Construction lines

  • Short center lines

  • Measurement lines

  • Diagonal lines used to state plane surfaces

  • Intersections

  • Leader lines

  • Backside section lines

Long break lines are represented by the 'Continuous Thin Straight Zigzag Line'.

Please read more on type of lines in technical drawings here

Inverted toothed chain drive - Len Academy

With regards to chain drives, the diagram above is a/an _____ chain.

  • A. Roller

  • B. Silent

  • C. Leaf

  • D. Flat-top

  • E. Detachable

  • F. Acceleration

ANSWER: Silent

The silent chains are series of toothed linked plates attached to one another in a pin-like manner that allow for free flexing of the chains.

They are typically used in industrial equipment where quietness, silence and smoothness are required.

Understand that the silent chains are also called inverted tooth chains.

A type of chain drive commonly used in bicycles is the _____ chain.

  • A. Roller

  • B. Silent

  • C. Leaf

  • D. Flat-top

  • E. Detachable

  • F. Acceleration

ANSWER: Roller

Roller chains are a type of chain drive utilized in bicycles. They are made of of series of small cylindrical rollers attached together at both sides of its entire length. It is shown in the image below:

Roller chain in bicycles - Len Academy

A chain drive consists of an endless chain running over two _____.

  • A. Hooks

  • B. Spikes

  • C. Spokes

  • D. Sprockets

  • E. Hinges

  • F. Danes

ANSWER: Sprockets

A chain drive is one of the mechanisms through which power is transmitted mechanically from an engine to the wheels via an endless rotating chain.

The chain drive consists of an endless chain running over two sprockets. See the image below:

Chain Drive - Len Academy

Please read more on chain drives, types and classifications here

Which is the most economical of all power transmitting drive mechanisms?

  • A. Pulley drive

  • B. Gear drive

  • C. Chain drive

  • D. Belt drive

  • E. Thread drive

  • F. Fabricated drive

ANSWER: Belt drive

Belt drives are the most economical in mechanical power transmission. This is one of the advantages it's got over other means power transmissions in drive mechanisms.

Please read more on the advantages and disadvantages of belt drives here

Meanwhile, understand that there's nothing like thread or fabricated drives in power transmission.

Which of the following is false concerning  drive mechanisms in machines?

  • A. Pulley drives do not require a means of power transmission

  • B. Gear drive is a means of power transmission

  • C. Chain drive is a means of power transmission

  • D. Belt drive is a means of power transmission

  • E. The drive mechanisms of machines accomplishes it's function via a rotational motion

  • F. Drive mechanisms results into a mechanical movements of machines via power transmission

ANSWER: Pulley drives do not require a means of power transmission

Pulley drives or systems requires a means of power transmission. Infact, they refer to a wheel of sets of wheel over which a belt or chain (as means of power transmission) is attached in order to create a mechanical movement or motion.

Understand that it's the drives in pulley systems that brings about mechanical power transmission. Instances of such drives include the belt drives, chain drives and gear drives respectively.

Please read more on the concept of drives and pulley systems here

Arrow head lines - Len Academy

The lines above are used at the end of dimension lines?

  • A. True

  • B. False

ANSWER: True

The lines shown in the above diagram are arrowhead lines and the are used at the end of dimension lines (for measurements).

Please read more on type and uses of lines in technical drawings here

Which of the following is not a type of maintenance?

  • A. Fixated

  • B. Overhaul

  • C. Predictive

  • D. Reinforcement

  • E. Periodic

  • F. Corrective

ANSWER: Fixated

Fixated is not a type of maintenance.

We typically have six types of maintenance. These are:

  1. Preventive maintenance

  2. Corrective maintenance

  3. Predictive maintenance

  4. Periodic maintenance

  5. Reinforcement

  6. Overhaul

Please read more on types of maintenance here

Which of the following is incorrect concerning preventive maintenance?

  • A. It is considered to be the best form of maintenance

  • B. Immunization is a form of preventive maintenance

  • C. Worn out parts may be discovered when preventive maintenance is carried out

  • D. Preventive maintenance is defined as the repairs carried out on an equipment or object after a correct prediction of an impending fault

  • E. A person who services his car monthly practices preventive maintenance (even though the car functions properly)

  • F. The main goal of preventive maintenance is to stop a device from breaking down suddenly

ANSWER: Preventive maintenance is defined as the repairs carried out on an equipment or object after a correct prediction of an impending fault

The above definition is attributed to predictive maintenance and not preventive maintenance.

Preventive maintenance is defined as a routine check on an object or equipment before it develops a fault.

Please read more on maintenance and types of maintenance here

The following statements are true concerning wood except _____.

  • A. It is an inorganic material

  • B. It is a structural tissue

  • C. It is composed mainly of cellulose

  • D. Hardwood and Softwood are types of wood

  • E. It constitutes the stems and branches of trees

  • F. It is porous and fibrous

ANSWER: It is an inorganic material

Wood is a an organic material. Infact, anything that originate from plants (or living organisms) is organic in nature.

Which of the following is not a characteristic of hardwood?

  • A. They are more fire resistant in comparison to softwood

  • B. Their stem are divided into trunks called dendritic form

  • C. Birch, Teak and Alder are examples of hardwood

  • D. They always have a higher density than softwood of the same mass

  • E. They are suitable for making deckings in buildings

  • F. Most hardwood are expensive than softwood

ANSWER: They always have a higher density than softwood of the same mass

The term 'always' made the above statement wrong. Most hardwood (but not all hardwood) have a higher density than softwood.  For example, Balsa is a hard wood that's actually soft in texture; and with a lower density.

Please read more on Hardwood vs Softwood here.

The outermost covering of a wood is called the _____.

  • A. Wood skin

  • D. Heartwood

  • C. Cortex

  • D. Cambium

  • E. Sclerenchyma

  • F. Bark

ANSWER: Bark

The outermost covering of a wood is called the bark. On peeling the bark, next to be seen is the sapwood. The cambium is seen around the edges of the sapwood.

Please read more on woods here.

The followings are characteristics of ceramics except _____.

  • A. They readily undergo oxidation

  • B. They have high melting point

  • C. They are durable

  • D. Most are insulators but graphite is a conductor of electricity

  • E. Most are non-magnetic

  • F. They have great tensile strength but graphite is soft

ANSWER: They readily undergo oxidation

Ceramics do not readily undergo oxidation. Infact, they are chemically unreactive or inert.

Please read more on ceramics and its characteristics here

Which of the following statement is false of ceramics?

  • A. They are not metals

  • B. They are not plastics

  • C. Ceramics can be absolutely defined by its products characteristics

  • D. Ceramic materials are not organic in nature

  • E. Ceramics are refractory in nature

  • F. Ceramics materials are usually made from clay

ANSWER: Ceramics can be absolutely defined by its products characteristics

Defining ceramics by their products' characteristics can be somewhat complicated because not all of them share the same feature. For instance, mugs are ceramics that tend to be hard (and are bad conductors of electricity) unlike graphite; another product of ceramics that's brittle (soft) and a good conductor of electricity.

Please read more on ceramics and their characteristics here

Which of the following is not a function of thin continuous line in Technical drawing?

  • A. Used for representing projection lines
  • B. Used as construction lines
  • C. Used for representing visible outline and edges
  • D. Used for representing leader lines
  • E. Used as intersection lines
  • F. Used as measurement lines

ANSWER: Used for representing visible outline and edges

Please read on the Types of Line in Technical Drawings here

The following are Types of Line in Technical Drawing except _____.

  • A. thin continuous line
  • B. inverse head line
  • C. thin dash line
  • D. continuous thin straight zigzag line
  • E. free hand line
  • F. chain thin line with thick ends

ANSWER: Inverse head line

Inverse Head Line is NOT a type of line in Technical Drawing

Please read on the Types of Line in Technical Drawing here

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Basic Technology topics

Belt Drives: Types of belt drive Ceramics: Types of Ceramics Advantages and Disadvantages of Chain drives Len Academy Questions for Basic Technology JSS3, 2nd Term, 2020 Len Academy Question for Basic Technology, JSS3, 2nd Term, 2020, Part 2 Belt and Pulley Drives: Types of Belt in Belt Drives Electromechanical Energy: Parts of the Refrigerator and how they operate Chain Drive, Types and Classifications What are Belt Drives? Advantages and Disadvantages of Belt Drives Type of Lines in Technical Drawings


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