CWC Junior Technical Assistant flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Reverse alphabet position

The reverse position of a letter equals 27 minus its forward position, so A becomes 26 and Z becomes 1. This rule resolves codes where letters are paired from opposite ends of the alphabet.

Syllogism particular premises

Two particular premises, such as 'some A are B' and 'some B are C', cannot yield a universal conclusion. Only a conclusion true in every possible Venn arrangement is valid.

Circular seating direction rule

When people face the centre of a circular table, a person's left is clockwise and right is counter-clockwise. When they face outward, both directions reverse.

Direction displacement formula

After a series of right-angle turns, the straight-line distance from start to finish equals the square root of the sum of the squares of net north-south and net east-west movement.

42nd Amendment Preamble changes

The 42nd Amendment Act of 1976 added the words socialist, secular and integrity to the Preamble. It is the only amendment made to the Preamble so far.

NABARD establishment year

NABARD was set up in 1982 as the apex institution for rural credit, refinancing agricultural and rural development. It took over agricultural credit functions from the Reserve Bank of India.

Right to Education article

Article 21A, inserted by the 86th Constitutional Amendment in 2002, makes free and compulsory education a Fundamental Right for children aged six to fourteen years.

Chandrayaan-3 landing

India's Chandrayaan-3 mission achieved a soft landing near the lunar south pole in August 2023, making India the first country to land in that region of the Moon.

Alligation mixing ratio

When two ingredients are mixed to a mean value, their quantities are in the ratio of the differences from the mean: mean minus cheaper to dearer minus mean.

Two-year CI minus SI

For two years at rate R percent, the difference between compound and simple interest equals the principal multiplied by R divided by 100, then squared.

Average speed equal distances

When equal distances are covered at speeds x and y, the average speed over the whole journey is 2xy divided by x plus y, not the simple mean of the speeds.

HCF and LCM product rule

For any two positive integers, the product of their highest common factor and lowest common multiple equals the product of the two numbers themselves.

Since versus for

'Since' is used with a point of time, as in since 2010, while 'for' is used with a duration, as in for three years. Both pair with perfect tenses.

One of plus plural noun

In the pattern 'one of the plus plural noun', the verb following is singular because the subject is 'one', even though the noun immediately before the verb is plural.

Second conditional structure

A second conditional states an unlikely present situation: the if-clause takes the past simple and the main clause takes would with the base verb.

Idiom: bolt from the blue

A bolt from the blue means a sudden and completely unexpected shock or event, as startling as lightning from a clear sky.

Safe storage moisture cereals

Cereal grains are generally stored safely at about twelve to fourteen percent moisture, with wheat and rice near twelve to thirteen percent. Higher moisture promotes mould and heating.

Phosphine fumigation condition

Phosphine, released from aluminium phosphide tablets, requires a gas-tight enclosure to reach lethal concentration. It works poorly below about fifteen degrees Celsius and faces insect resistance.

Grain hot spot cause

Respiration by grain and microorganisms releases heat and moisture. When this heat cannot escape, it accelerates further biological activity and creates a self-reinforcing hot spot.

Equilibrium moisture content

Equilibrium moisture content is the moisture a grain settles at for a given temperature and relative humidity. Warmer air at the same humidity gives a lower equilibrium moisture.

Young's modulus definition

Young's modulus is the ratio of tensile stress to tensile strain within the elastic limit. It measures stiffness, and steel is far stiffer than aluminium.

Screw jack velocity ratio

For a screw jack, the velocity ratio equals twice pi times the lever length divided by the pitch of the screw thread, giving large mechanical advantage.

Three-phase power formula

Three-phase electrical power equals the square root of three, multiplied by line voltage, line current and power factor. Single-phase power is simply voltage times current times power factor.

Vernier least count

The least count of a vernier caliper equals one main-scale division minus one vernier-scale division. With a typical scale it works out to 0.02 millimetres.

Safe working load

The safe working load of lifting gear equals its breaking load divided by the safety factor. The rated capacity marked on equipment must never be exceeded.

Sling angle tension effect

As the angle between sling legs widens, tension in each leg increases. At thirty degrees to the horizontal, each leg carries the full load.

Forklift load centre distance

The load centre distance is the horizontal distance from the fork face to the load's centre of gravity. Increasing it reduces the capacity a forklift can safely handle.

Dust explosion requirements

A dust explosion needs combustible dust, oxygen, an ignition source and dispersion of the dust into a cloud. Removing any one of these conditions prevents the explosion.

FIFO stock rotation

First in, first out means older stock is dispatched before newer stock. It limits deterioration of produce held in warehouses and reduces expiry losses.

Mechanical advantage formula

Mechanical advantage equals load divided by effort. Efficiency of a machine equals mechanical advantage divided by velocity ratio, expressed as a percentage.

Successive percentage change

Two successive percentage changes of a and b produce a net change of a plus b plus the product ab divided by one hundred, which may be an increase or decrease.

Comprise usage rule

The verb comprise means to consist of and takes a direct object without 'of'. 'Comprises of' is incorrect, while 'is composed of' is the accepted alternative.