📝 [PIPE] QB ID: 1517081204 | Advanced Coaching Series | Set 06 – Elements

In Refrigeration, how do you call a heat exchanger in which low-pressure refrigerant boils or vaporizes, thus absorbing heat that was removed from the refrigerated area by the cooling medium (water)?

It is a type of refrigeration system where only part of the circulated refrigerant is evaporated, with the remainder being separated from the vapor and then recirculated. How do you call this system?

How do you call the ice formation on a refrigeration system at the expansion device, making the device inoperative?

In a lithium bromide solution absorption refrigeration system, which of the following is the function of water?

In the absorption refrigeration system, is a pressure vessel mounted above the generator through which the vapor leaving the generator pass. How do you call this component?

In the absorption refrigeration system, it is the inlet part of the condenser, cooled by a separate circuit of cooling water or strong aqua. It condenses a small part of the vapor leaving the bubble column and returns it as a liquid to the top of baffle plate. This ensures that the vapor going to the condenser is lowered in temperature and enriched in ammonia. What is this component?

Which of the following is a scale of temperature in which the melting point of ice is taken as 0° and the boiling point of water is 80°?

How do you call the mixtures or substances that are used in laboratory methods of producing a drop in temperature? The most common example is the mixture of ice and salt.

It the maximum temperature of any gas or vapor at which it may be condensed into a liquid; above this temperature, it is impossible to condense regardless of the pressure applied. How do you call this temperature?

Any refrigerant that exists as a liquid under normal atmospheric pressure and temperature must be vaporized in an evaporator under a pressure below atmospheric. This is sometimes referred to as:

It is any one of a group of refrigerants that have been developed since about 1925 to overcome the irritating or toxic effects of refrigerants, such as ammonia and sulfur dioxide and the high condensing pressures required with carbon dioxide. How do you call these refrigerants?

This refrigeration system component combines the functions of a cooling tower and a condenser. It consists of a casing enclosing a fan or blower section, water eliminators, refrigerant condensing coil, water pan, float valve, and spray pump outside the casing. How do you call this component?

It refers to a factor used in calculating the over-all heat transfer through the tube walls of a condenser tube or other heating surface. It includes the sum of the heat-transfer rate of the layer of dirt and foreign material that builds up on the water side of the tube. What is this factor?

It is a refrigeration system evaporator which is arranged with a tank or a single drum (accumulator) located above the coil so that the inside of the evaporator is full of refrigerant. How do you call this type of evaporator?

What is the standardized term used by the industry to describe any device that meters or regulates the flow of liquid refrigerant to an evaporator?

Define a “control valve”.

A pneumatic temperature control is used on the steam supply to a non-storage heat exchanger that heats water serving an office heating system. What is referred to as “manipulated variable”?

Which of the following valves is the one designed to allow a fluid to pass through in one direction?

How do you classify a solenoid valve?

What is a thermostat?

Which of the following is one of the main purposes of refractory in a boiler furnace?

Balance pressure traps are what type of steam trap?

What is a characteristic feature of thermodynamic steam traps?

What are the main considerations for steam trap selection?

Can temperature controlled applications be trapped?

Unless they are designed to flood, what is the important when removing condensate from heat exchangers?

How is flash steam produced?

Are steam traps required to pass air?

How do you call a system employing open sprinklers attached to a piping system connected to a water supply through which is opened by the operation of a fire detection system installed in the same areas as the sprinklers?

What is probably the first consideration when selecting a control system?

Which of the following ranges of humidity ratio is used for comfort air conditioning?

When adding the refrigerant in a refrigeration system, it shall be charge into which of the following parts of the system?

Why is a boiler feed tank heated to approximately 85 °C?

What is used to dry air?

What causes water hammer in the boiler?

How does air enter a steam system?

Why should strainers installed on steam lines be fitted on their sides?

What is the result of using a heat exchanger rating to calculate its steam consumption?

A heat exchanger has a design rating based on a working pressure of 7 bar g. What would be the effect of supplying the exchanger with steam at 3 bar g?

For any particular tank temperature how does the heat loss from the lid of a closed tank compare with that of bottom?

What is the disadvantage of heating a tank by direct steam injection?

The existing 2000 TR chiller at a large hospital, where you are assigned as Engineer, must be replaced. Which of the following types most likely to be installed?

Refrigeration condensers are rated based upon their ability to reject the total heat that comes from which of the following?

A published ‘U’ value from a steam coil to a water-based solution is given as 550 – 1300 W/m²-°C. When would be figure near the lower end of the range be used?

Steam coils should enter and leave the top of a tank when:

What range of ‘U’ values would you apply for mild steel jacket around a stainless steel tank containing a water and detergent solution?

A tank is to be heated by direct steam injection. How will the quantity of heat required compare with steam coil heating?

Which of the following parameters has the greatest limiting effect on the thermal performance of an open, evaporative cooling tower?

Air enters a cooling tower at 10 °C DB and 9.5 °C WB temperature. It leaves the tower saturated at 21 °C. Which condition is a likely outcome of this?

It is a space, or several rooms, or units of space having some sort of coincident loads or similar operating characteristics. It may or may not be an enclosed space, or it may consist of many partitioned rooms. How do you call this?

In air conditioning, it indicates either a volume or a site without a partition or a partitioned room or group of rooms. How do you call this?

It is an enclosed or partitioned space that is usually treated as a single load. If conditioned, it often has an individual control system. What is this?

It represents the rate, in Btu/hr or W, at which heat enters a conditioned space from an external source or is released to the space from an internal source during a given time interval.

It is the rate, in Btu/hr or W, at which heat must be removed from a conditioned space so as to maintain a constant temperature and acceptable relative humidity. Its sensible load component is equal to the sum of the convective heat transfer from the surfaces of the building envelope, furnishings, occupants, appliances, and equipment. How do you call this?

An Engineer claims to have created a heat engine that produces 15 kW of power for a 20 kW input while operating between energy reservoirs at 37 °C and 400 °C. Is the Engineer’s claim valid?

A process that the body uses to convert energy in food into heat and work, or it is the process that determines the rate at which energy is converted from chemical to thermal form within the body.

What is a body insulation that is usually described as a single equivalent uniform layer over the whole body?

What is the insulating value of clothing?

Which of the following is the value of clo units?

What is the basic index used to describe the radiant conditions in a space, it is the mean temperature of individual; exposed surfaces in the environment?

In order to avoid cavitation in a centrifugal pump, which of the following is true?

What always accompanies an isentropic expansion of steam?

Those substance that are particularly variable in the moisture content that they can possess at different times.

The hygroscopic moisture content of a substance expressed as a percentage of the bone-dry-weight of the material.

What is the advantage of a pressurized deaerator over an atmospheric deaerator?

In proximate analysis, the coal analysis is consisting of moisture content, fixed carbon, ash, and which of the following?

How do you call the heating value of the fuel if the water in the products of combustion is in the liquid state?

What is the rate, in Btu/h or W, at which heat must be added to the conditioned space to maintain a constant temperature and sometimes a specified relative humidity?

Space heat extraction rate Qex, Btu /h (W), is the rate at which heat is actually removed from the conditioned space by the air system. Its sensible heat rate component is equal to the sensible cooling load only when the space air temperature remains constant.

It is the rate, in Btu/h or W, of heat transfer at the coil. Its cooling load component is the rate at which heat is removed by the chilled water flowing through the coil or is absorbed by the refrigerant inside the coil. What do you call this?

It is the rate, in Btu/hr or W, at which heat is added to the conditioned air from the hot water, steam, or electric heating elements inside the coil.

What is the rate, in Btu/hr or W, at which heat is absorbed by the refrigerant at the evaporator. For central hydronic systems, it is the sum of the coil load plus the chilled water piping heat gain, pump power heat gain, and storage tank heat gain. For most water systems in commercial buildings, the water piping and pump power heat gain is only about 5 to 10 percent of the coil load. In an air conditioning system using DX coil(s), it is equal to the DX coil load.

It is a humidity sensor used to measure relative humidity, dew point, or absolute humidity of ambient or moving air. This device could be mechanical or electronic. How do you call this?

It is a device designed to control the flow of steam, water, gas, or other fluids. It can be considered a variable orifice positioned by an actuator in response to impulses or signals from the controller. It may be equipped with either a throttling plug, V-port, or rotating ball specially designed to provide a desired flow characteristic. How do you call this device.

Assume that you are checking the water level in a boiler which is on the line in a power plant. Upon opening the gage cocks, you determine that the water level was above the top gage cock. Of the following actions, the best one to take first in this situation would be to:

It is a component in a hydro plant that absorbs water hammer during load fluctuations and serves as an auxiliary reservoir during high load demands. What is this component?

It is a bituminous coal that contains plenty of hydrocarbons, forming lumped masses when burned. This coal is ideal for forming carbonaceous gases for reduction of ore. What do you call this coal?

It is the temperature at which the oil vapors will continue to burn when ignited.

It is the temperature to which oil has to be heated until sufficient flammable vapor is driven off to flash when brought into momentary contact with a flame. How do you call this temperature?

The color of a lubricating oil is obtained by reference to transmitted light; the color by reflected light is referred to as:

How do you call the material left after heating an oil under specified conditions at high temperature, and is useful as a quality control tool in the refining of viscous oils, particularly residual oils?

Petroleum oils, when cooled, may become plastic solids, either from wax formation or from the fluid congealing. With some oils, the initial wax crystal formation becomes visible at temperatures slightly above the solidification point. When that temperature is reached at specific test conditions, it is known as the

It is the temperature at which cooled oil will just flow under specific test conditions; and it indicates the lowest temperature at which a lubricant can readily flow from its container. How do you call this temperature?

It is a term indicating the measure of acidic components in oils; and was original intent to indicate the degree of refining in new oils, and to follow the development of oxidation in service, with its effects on deposit formation and corrosion. What is this?

How do you call a measure of alkaline components in oils, especially those additives used in engine oils to neutralize acids formed during fuel combustion?

These are materials with low coefficients of friction compared to metals, and they are used to reduce friction and wear in a variety of applications. There are a large number of such materials, and they include graphite, molybdenum disulfide, polytetrafluoroethylene, talc, graphite fluoride, polymers, and certain metal salts. How do you call these materials?

These are engine oil additives used to help keep the engine clean by solubilizing and dispersing sludge, soot, and deposit precursors. How do you call these oil additives?

How do you call these engine oil additives used to prevent attack on sensitive bearing metals?

These are engine oil additives used to prevent or reduce deposits and corrosion by neutralizing combustion by-product acids. What are these additives?

What is the molecular attraction of layers of an unlike matters?

How do you call these engine oil additives used to prevent attack on iron and steel surfaces by condensed moisture and acidic corrosion products, aggravated by low-temperature stop-and-go operation?

How do you call these engine oil additives used to help enable adequate low-temperature flow, along with sufficient viscosity at high temperatures?

These oil additives are used to minimize wear under boundary lubrication conditions, such as cam and lifter, and cylinder-wall and piston-ring surfaces.

These are engine oil additives used to allow air to break away easily from the oil.

These engine oil additives are used to improve fuel efficiency by reducing friction at rubbing surfaces. How do you call these oil additives?

How do you call an opening where hot source of energy from the earth is harnessed?

At standard atmospheric conditions, what is the approximate speed of sound?

The speed of sound is also called as:

This is the velocity at which a small pressure wave moves through a fluid. How do you call this velocity?

Which of the following is the speed of light?

What can you say about entropy in the universe?

Which of the following is the chemical formula of butane?

If the sensible heat ratio is 0.75, what does it mean?

The hardness of ground water required as feed water for a boiler is 0 – 10 ppm (part per million), which of the following is the range of alkalinity requirement?

As used in the Revised PSME Code for Boilers and Pressure Vessels, it is any boiler which does not exceed any of the following limits: 405 mm inside diameter, 1065 mm overall length of outside to outside heats at center, 1.85 m² of water heating surface, and 7.03 kg/cm² maximum allowable working pressure. What is this boiler?

It is a closed vessel in which steam or other vapor (to be used externally to itself) is generated by the direct application of heat used for power generation. How do you call this boiler?

It is a closed vessel intended for use in heating water of for application of heat to generate steam or other vapor to be used externally from it. What do you call this pressure vessel?

What do you call a vessel in which pressure is obtained from external sources, or from an indirect application of heat?

It is any boiler or unfired pressure vessel constructed, installed, placed in operation but subject to annual inspection. What do you call this?

It is a boiler that has been inspected and declared unsafe to operate or disqualified, marked and marked indicating its rejection. How do you call this boiler?

When new boilers are installed in either existing or new buildings, a minimum height of at least ______ shall be provided between top of the boiler proper and ceiling.

For power boilers, when the tensile strength of steel is not known, it shall be taken as 379 MPa and which of the following for the wrought iron?

They operate by sensing condensate temperature

A float is fitted with an automatic air vent

The trap can be use on larger backpressures

It can be used on higher pressure

Inverted bucket trap

A balanced pressure steam trap

Too low a steam pressure onto the coil

Rotating cylinders can not suffer from steam locking