Design metal temperature (DMT)

The tube metal or skin temperature used for design.  This is determined by calculation using either the maximum tube metal temperature or the equivalent tube metal temperature shown in API RP 530

Decarburization

In decarburization, carbon content is reduced from outer surface. So the surface layer becomes soft which is responsible for lowering of fatigue resistance.

Duct

A conduit for air or flue gas flow.

Downcomer

Boiler tubes or pipes where the fluid flow is away from the steam drum

Damper

A device for introducing a variable resistance for regulating volumetric flow of gas or air.

Density

The density of a substance is the total mass (m) of that substance divided by the total ρ volume (V) occupied by that substance (mass per unit volume).

Drag

As the airplane moves through the air, there is another aerodynamic force present. The air resists the motion of the aircraft; this resistance force is called the drag of the airplane. Like lift, there are many factors that affect the magnitude of the drag force including:
" shape of the airplane
" "stickiness" of the air
" speed of the aircraft

Diagonal of a polygon

 The line which joins two non-consecutive vertices is known as diagonal of a polygon.

Distributive Pronoun

The pronoun which refers to persons or things one at a time

Demonstrative Pronouns

The pronouns which are used to point out the object or objects to which they refer.

Dormant / Inoperative Account

A dormant/inoperative account is a savings bank or current account in

which there are no transactions for over a period of two years.

Demat accounts

A Demat account refers to dematerialised account and is an account in

which the stocks of investors are held in electronic form.

Disjoint Sets

Two sets are said to be disjoint sets when they do not have any common element.

Deposit Accounts

•“Savings deposits” means a form of demand deposit which is subject to

restrictions as to the number of withdrawals as also the amounts of

withdrawals permitted by the bank during any specified period.

• “Term deposit” means a deposit received by the bank for a fixed period

withdrawable only after the expiry of the fixed period and includes

deposits such as Recurring/Short Deposits/Fixed Deposits/ Monthly

Income Certificate/Quarterly Income Certificate etc.

• “Notice Deposit” means term deposit for specific period but withdrawable

on giving at least one complete banking day’s notice.

Deceased account

A Deceased account is a deposit account in which case either the single

account holder has deceased or in case of joint accounts one or more of joint

account holders has/have deceased.

Declarative Sentence

A sentence that states or declares something

Bill purchase / discounting

Bill purchase / discounting are modes of extending credit to the seller of
goods who has raised demand / usance bill of exchange. Demand bills are
purchased and usance bills are discounted.

Direct Tax

A tax levied directly on individuals or firms. These taxes are not transferable. Some examples are income tax & capital gains tax.

Demand

By demand is meant the quantity of a commodity that will be bought at a particular price and not merely the desire for a thing. Generally at a high price,less will be bought than at a low price.

Income / Debt Oriented Scheme

The aim of income funds is to provide regular and steady income to investors. Such schemes generally invest in fixed income securities such as bonds, corporate debentures, Government securities and money market instruments. Such funds are less risky compared to equity schemes. These funds are not affected because of fluctuations in equity markets. However, opportunities of capital appreciation are also limited in such funds. The NAVs of such funds are affected because of change in interest rates in the country. If the interest rates fall, NAVs of such funds are likely to increase in the short run and vice versa. However, long term investors may not bother about these fluctuations.