Radiant section of a Heater/ Boiler

Portion of the heater in which heat is transferred to the tubes, primarily by radiation.

Repair

Work necessary to restore equipment to a condition of safe operation at the design conditions.

Riser (Boiler)

Boiler tubes where the fluid flow is toward the steam drum.

Reflective pronouns

Reflective pronouns indicate that the subject of a sentence is both giving and receiving the action of the verb.

Reynold's Number

It is the ratio of inertia force of a flowing fluid and the viscous force of the fluid.

Reversible Process

A reversible process for a system is defined as a process that, once having taken place, can be reversed, and in so doing leaves no change in either the system or surroundings.

Rankine cycle

Also referred to as the steam cycle, the Rankine cycle utilizes the evaporation-condensation properties of a working fluid to drive a turbine. Water vapor, or steam, is often used as the working fluid for these processes. A pump is used to circulate the fluid through a boiler, where it is heated (or boiled) at a constant pressure into steam, after which it is expanded through a turbine for energy extraction.  It is a "closed" system, in that the working fluid is recycled.

Rankine (R) scale

The absolute scale that corresponds to the Fahrenheit scale is called the Rankine (R) scale.

Relative humidity

Relative humidity is the amount of water vapor present in the air divided by the maximum amount that the air could contain at that temperature. Relative humidity is expressed as a percentage.

Rolled homogeneous armour

Rolled Homogeneous Armour, or RHA, is a theoretical basic type of steel plate, used as a baseline to compare the effectiveness of military vehicle armour. This can be used to protect the vehicles from spalls or blasts.

Rectangular matrix & Row matrix

Rectangular matrix
If the number of rows is not equal to the number of columns then the matrix is called a rectangular matrix.

Row matrix
If there is only one row in a matrix, it is called row matrix.

Ratio

If two quantities expressed in the same units are compared by division the result obtained is called a ratio.

Right angled triangle

A triangle in which one of the angle is a right angle (90 degree) is called a right angled triangle.

Repossession

Repossession is the process by which a creditor with a loan secured on

house or goods (e.g. car) takes possession of the security, if the debtor does

not repay as per the terms of the loan agreement.

Reasonable

Governed by or being in accordance with reason and sound thinking; being

within the bounds of common sense; not excessive or extreme.

Regular Polygon

The polygon in which all sides are equal and each interior and exterior angles are equal.

Real Time Gross Settlement

The acronym ‘RTGS’ stands for Real Time Gross Settlement. RTGS system

offers the fastest means of transfer of funds through banking channel.

Settlement of transactions under RTGS takes place on one-to-one basis,

which is termed as ‘Gross’ settlement and in ‘real time’ i.e. without any

waiting period.

Reference rate

It is the benchmark rate of interest of a bank to which interest on loans

sanctioned under floating rate of interest is linked. The Reference Rate

of interest is determined/modified by individual banks in accordance with

their policies.

Reflexive Pronouns

When the action done by the subject turns back (reflects) upon the subject

Rehabilitation Package

Rehabilitation package is the package drawn for the rehabilitation of a sick

unit. The package has to be drawn in accordance with the RBI stipulations

and it usually consists of

i) Working Capital with relaxation in the rate of interest in terms of

regulatory guidelines

ii) Funded Interest Term Loan

iii) Working Capital Term Loan

iv) Term Loan

v) Contingency Loan Assistance