[PIPE] Question Bank for Advanced Coaching Series | Set 6 – Elements | Part 6

It is a heat exchanger which utilizes the heat of the flue gases to preheat the air needed for combustion.

It is a feedwater preheating and waste heat recovery device which utilizes the heat of the flue gases.

It is a system of furnace cooling tubes which can extend the evaporative capacity of the water-tube boiler and at the same time protect the furnace walls from high temperature.

It is based on the generation of 34.5 lbm/hr of steam from water at 212°F to steam at 212°F and equivalent to 33,500 Btu/hr.

It prevents boiler pressure from rising above a certain predetermined pressure by opening to allow excess steam to escape into the atmosphere when that point is reached, thus guarding against a possible explosion through excessive pressure.

In a water-tube boiler, the water will pass through _____.

It is the temperature to which the air becomes saturated at constant pressure.

In a _____ cooling tower, the air moves horizontally through the fills as the water moves downward.

It is the subject that deals with the behavior of moist air.

It is the ratio of the mass of water vapor in a certain volume of moist air at a given temperature to the mass of water vapor in the same volume of saturated air at the same temperature.

Air whose condition is such that any decrease in temperature will result in condensation of water vapor into liquid.

It is the warm water temperature minus the cold-water temperature leaving the cooling tower.

The temperature where the relative humidity becomes 100% and where the water vapor starts to condense is known as _____.

The surrounding air _____ temperature is the lowest temperature to which water could possibly be cooled in a cooling tower.

Which is not a major part of the vapor compression system?

This refers to the rate of heat transfer attributable only to a change in dry-bulb temperature

It is a binary mixture of dry-air and water-vapor.

The temperature measured by an ordinary thermometer.

The mass of water interspersed in each kilogram of dry air.

This system combines two vapor-compression units, with the condenser of the low-temperature system discharging its heat to the evaporator of the high-temperature system.

A process of increasing the humidity ratio at constant dry-bulb temperature.

The ratio of the partial pressure of water vapor in the air to the saturation pressure corresponding to the temperature of the air.

It is an air conditioning process that involves heating without changing the moisture content of air. The process is represented by a horizontal line In the psychrometric chart, from left to right.

It is an air conditioning process of increasing the humidity ratio without changing the dry-bulb temperature of air. The process is represented in the psychrometric chart by a vertical line, from up to down.

The temperature at which the water vapor content of moist air begins to condense when air is cooled at constant pressure.

It is the index of performance of a refrigeration system which is a dimensionless quantity.

It is simply the compression of the gas in two or more cylinders in place of a single cylinder compressor.

The transfer of energy from the more energetic particles of a substance to the adjacent less energetic ones as a result interactions between the particles.

What is the simultaneous control of temperature, humidity, air movement, and quantity of air in space?

The non-condensing component of the moist air.

The substance used for heat transfer in a vapor compression refrigeration system. It picks up heat by evaporating at low temperature and pressure and gives up this heat by condensing at a higher temperature and pressure.

What is the pressure of the refrigerant between the expansion valve and the intake of the compressor in a multi-pressure refrigeration system?

A refrigerating machine that is classified as a one-ton machine has the capacity to produce a cooling effect of:

Heat conduction is governed by

In gases and liquids, heat conduction is due to

In solids, heat conduction is due to

A property of material that measures its capacity to conduct heat rate through a unit thickness per unit area per degree change in temperature.

The analogy of heat transfer to equivalent electrical circuit suggests that heat is analogous to

The analogy of heat transfer to equivalent electrical circuit suggests that the temperature difference is analogous to

The analogy of heat transfer to equivalent electrical circuit suggests that the thermal resistance is analogous to

Thermal conductivity has a unit expressed in

Thermal resistance or R-value of a material has a unit expressed in

Heat conduction per square meter area of a material is termed as

The basic foundation of heat transfer mechanism is

The ratio of heat conducted through the material to the heat stored per unit volume is

Thermal conductivity of gases is said to be

Thermal conductivity of gases is said to be

A low value for thermal resistance indicates that the material is

Convection on solid surface is mainly due to

Forced convection on solid surface is due to