BTEB Diploma in Engineering Semester Final Examinations flashcards

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

Ohm's law

The current through a conductor is directly proportional to the voltage across it at constant temperature, expressed as V = IR where R is resistance in ohms.

Synchronous speed formula

For an AC machine, synchronous speed equals 120 times the supply frequency divided by the number of poles, giving revolutions per minute.

Bending stress equation

Bending stress at a distance y from the neutral axis equals M times y divided by I, where M is bending moment and I is second moment of area.

Euler buckling load

The critical load for a slender pin-ended column is pi squared times the product of Young's modulus and second moment of area, divided by the square of its length.

Slump test purpose

A fresh concrete test that measures workability or consistency by the vertical settlement of a moulded concrete cone after the mould is lifted.

Cache memory role

A small fast memory between the processor and main memory that stores recently used data to reduce average access time and memory bottleneck effects.

Equation of motion v=u+at

Final velocity equals initial velocity plus acceleration multiplied by time, valid only when acceleration is constant over the interval considered.

Kinetic energy formula

The kinetic energy of a moving body equals one half times its mass times the square of its velocity, measured in joules in SI units.

Quadratic formula

The roots of ax squared plus bx plus c equal zero are minus b plus or minus the square root of b squared minus four ac, all divided by two a.

Derivative of x to the n

The derivative with respect to x of x raised to a constant power n equals n times x raised to the power n minus one.

Molarity definition

Molarity is the number of moles of solute dissolved in one litre of solution, expressed in moles per litre and denoted by the symbol M.

pH scale meaning

pH equals the negative base-ten logarithm of hydrogen ion concentration; values below seven are acidic and above seven are basic at room temperature.

First-angle projection rule

In first-angle projection the object sits between the observer and the plane, so the top view appears below the front view on the sheet.

ISO A0 sheet size

An A0 drawing sheet measures 841 millimetres by 1189 millimetres, giving an area of one square metre, and each smaller size halves the longer side.

Hidden edge line convention

Hidden edges and outlines are drawn with short dashes of equal length, thin in weight, so they are distinguishable from visible continuous outlines.

Representative fraction of scale

Representative fraction is the ratio of drawing length to actual length; a scale of one to fifty means one millimetre on paper represents fifty millimetres.

Isometric axes angle

In isometric projection the three principal axes are drawn at 120 degrees to each other, with vertical lines remaining vertical and the other two at 30 degrees to horizontal.

Drill spindle speed rule

Spindle speed in revolutions per minute equals one thousand times the cutting speed in metres per minute, divided by pi times drill diameter in millimetres.

IEC wiring colour code

Under IEC practice, brown identifies the line conductor, blue identifies the neutral conductor, and green with yellow identifies the protective earth conductor.

Lockout tagout purpose

A safety procedure in which energy sources are isolated, locked, and tagged before maintenance so that a machine cannot be started unexpectedly.

Mortise and tenon joint

A carpentry joint where a projecting tenon on one member fits into a matching mortise hole in another, resisting both tension and compression along the members.

Bend allowance formula

Bend allowance equals pi divided by 180, multiplied by bend angle in degrees, multiplied by the sum of inside radius and K times thickness.

Present perfect tense use

Formed with have or has plus the past participle, it describes an action completed at an unspecified time or continuing relevance to the present moment.

Active to passive conversion

The object becomes the subject, the verb becomes a form of be plus past participle, and the original subject appears in a by-phrase if needed.

Bangla vowel and consonant count

The standard Bangla alphabet contains eleven vowels, called swarabarna, and thirty-nine consonants, called byanjanbarna, in its conventional classification.

Bangla sandhi meaning

Sandhi is the joining of two adjacent sounds into one form; vowel sandhi joins vowels, consonant sandhi joins consonants, and visarga sandhi involves the visarga.

Break-even quantity formula

Break-even quantity equals total fixed cost divided by the difference between selling price per unit and variable cost per unit.

Contribution margin ratio

The ratio of selling price minus variable cost to selling price, showing the fraction of each sale available to cover fixed costs and profit.

Maslow hierarchy order

Needs ascend from physiological through safety, social belonging, and esteem to self-actualisation, with lower needs generally satisfied before higher ones motivate behaviour.

Critical path definition

In a project network the critical path is the longest sequence of dependent activities; its total duration sets the shortest possible project completion time.

Fixed versus working capital

Fixed capital is invested in long-term assets such as plant and machinery, while working capital funds short-term needs like raw materials and wages.

Straight-line depreciation

Annual depreciation equals original cost minus estimated salvage value, divided by useful life in years, giving an equal charge each year.