it an ideal rankine cycle with fixed boiler and condenser pressure. What is the effect of superheating the steam to a higher temperature to the cycle thermal efficiency?

it has several functions. When necessary it empties the boiler for cleaning, inspection, or repair. It blows out mud scale, or sediment when the boiler is in operation and prevents excessive concentration of soluble impurities in the boiler

A type of coal that produced a fused coal mass as it burns.

If frost forms on the cylinders, the cause would be:

The condition in which droplets of water are carried by steam in the boiler

Working fluids used in refrigeration cycle decreases in temperature as they pass through the throttle valve. The Joule-Thompson coefficient of these fluids is

Analysis of solid fuel to determine moisture, volatile matter, fixed carbon, and ash expressed as percentage of the total weight of the sample

The water added to boiler feed to compensate for the water lost through blowdown, leakage, etc

The solenoid valve is controlled by

If the discharge side of the thermal expansion valve is warmer than the inlet, it indicates

During the emergency operation of the boiler, when there is no water in the gauge glass and steam comes out of the bottom trycock, the water level cannot be determined. What preventive measure the operator does to save the boiler

A common test and very important when a boiler is being repaired and or replaced before being back in operation or in service is known as

Under normal operating conditions, when a solid material to be dried is placed inside a batch tray dryer, the material is usually subjected

Why should you avoid bending or twisting of fan blades in an air conditioning unit?

An office air conditioning system drew in a quantitity of hot air from outside, cooled it to 1 deg C, and mixed it with the internal air of a building. Care was taken to supply enough fresh air to eliminate objectionable odors. The temperature of the space was maintained constant, and yet some people became uncomfortable in the afternoon, why?

Ammonia leaks in the condenser can be detected by:

Scale in boiler can.

It is inversely proportional to the power required to grind the coal to certain fitness

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

Is the most common dryer used which consist of rotating cylinder inside which the materials flow while getting in contact with hot gas

The hands feel painfully cold when the skin temperature reaches

Use to minimize the speed rise due to a sudden load rejection

Which of the following is NOT the cause of black smoke in diesel engine?

Two-stroke engine performs, to complete one cycle.

Is a reaction during which chemical energy is released in the form of heat.

By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit will

If the cut-off ratio of diesel cycle increases, the cycle efficiency will

The fuel used in a power plant that is used during peak periods.

Refrigerant consisting of mixtures of two or more different chemical compounds, often used individually as refrigerant for other applications.

Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them.

An enclosed passageway that limits travel to a single path.

For immediate dangerous to life or health (IDHL), the maximum concentration from which unprotected persons are able to escape within without escape-impairing symptoms or irreversible health.

The quantity of refrigerant stored at some point is the refrigeration system for operational, service, or standby purposes.

A service valve for dual pressure-relief devices that allows using one device while isolating the other from the system, maintaining one valve in operation at all times.

Is a premises or that of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.

Is one in which a secondary coolant is in direct contact with the air or other substance to be cooled or heated.

Refrigerant number R-1150 is

Refrigerant R-40 is

The space above a suspended ceiling shall not be included in calculating the permissible quantity of refrigerant in the system unless such space is continuous and is part of the air return system

Which of the following is not a possible location of service valve?

A type of refrigerant control typically used in household refrigeration

Sight glass is often located at

Refrigerant piping crossing an open space that affords passageway in any building shall be not less than __ above the floor unless the piping is located against the ceiling of such space and is permitted by the authority having jurisdiction

Are suitable for use in ammonia system

Liquid receivers, if used or parts of a system designed to receive the refrigerant change during pumpdown charge. The liquid shall not occupy more than ___ of the volume when temperature of the refrigerant is 90°F.

Dissolved gases like ___ make water corrosive, reacting with metal to form iron oxide.

A cycle typically used in paper mills, textile mills, chemical factories, sugar factories and rice mills.

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

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

It is 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?

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?

Which of the following types of portable fire extinguisher is recommended as most effective for putting out oil fires?

The amount of heat in Btu/lb that is given off by the system in the discharge line and the condenser in referred to as the

What type of HRSG is most commonly used in large combined cycle plants?

Moisture in a refrigeration system can cause ______.

Which fuel is most commonly used in combined cycle plants?

A reciprocating refrigeration compressor may be tested for leaking discharge valves by stopping the compressor, turning the discharge service valve all the way in, and then turning the compressor over by hand. If the discharge valves are leaking, the compressor

During tests to discover why a refrigeration compressor is running continuously, it is determined that the refrigerated space temperature is slightly above normal without ever reaching the desired minimum temperature. Suction and discharge pressures are normal for the corresponding box temperature. In this situation, what should you suspect?

A refrigeration system is equipped with a reciprocating compressor and a water cooled condensing unit. If the system is overcharged, the resulting high head pressure will be caused by

Which of the following statements described the accepted method for testing a thermostatic expansion valve?

In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valve, used in conjunction with an unloader head, is energized?

Which cycle governs the bottoming cycle in combined cycle plants?

The best time to check the oil level in the compressor in a typical refrigeration system is when the compressor is stopped after a long period of running. This is because the ________.

Hot gas bypass is one of the methods used to __________.

Which turbine arrangement is common for large thermal stations?

A particular space is air conditioned by a 25 ton water cooled system. While troubleshooting, the space is found to be too warm, and the compressor is not operating. A service check determines the compressor suction pressure to be above the normal cut-in.

Which technology enhances flexibility of coal-fired plants for variable load operation?

Which cycle governs the operation of hydro power plants?

Which component extracts energy from hot gases to drive the compressor?

A pipe containing sprinklers crossing a cross main.

What is the main disadvantage of regeneration in gas turbines?

What is the relationship between base load and variable load in a power system?

When multiple refrigerated boxes are maintaining individual temperatures and supplied by a single refrigeration compressor, the individual box temperatures are controlled by the

When you adjust thermostatic expansion valve

What is the effect of part-load operation on NOx formation in gas turbines?

During standstill, liquid may condense in the crankcase or oil separator. Why is it important to heat up the oil before start?

The fine particulate residue carried out with exhaust gases during coal combustion is called:

A structure installed at the intake of a hydroelectric power plant to prevent debris from entering the turbines is called a:

A heat exchanger used to transfer heat from flue gases to incoming combustion air is known as a:

The hard, fused mass of ash formed in furnaces during coal combustion is called:

The generating capacity that is online and can be made available immediately to meet sudden load changes is known as:

The additional generating capacity available above the maximum demand is called:

It is an above ground pipe, approximately vertical and brings water from the supply source.

Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?

Which refrigerant is a zeotropic blend commonly used as a substitute for R-22?

Which refrigerant is identified by a bright green color in system labeling or identification?

In a vapor-compression refrigeration system, the evaporator is located on the:

The process of adding moisture to air is known as:

A device used in boilers to reduce steam temperature by spraying water into the steam is called a:

To avoid lose of prime and other suction lift problems, ______ (i.e. “sump pumps”) with submerged impellers can be used when drawing water from a deep well or sump.

It emits water in a one-quarter sphere away from the wall, with a small amount directed at the wall.

Sweating of the refrigeration system compressor crankcase is caused by

It is a soldered fusible link that separates at a specific temperature.

Oil separators installed in refrigeration systems serve to

Which thermodynamic cycle represents the maximum possible efficiency between two given temperature limits?

The ideal thermodynamic cycle that best represents a spark ignition (gasoline) engine is the:

Light hazard areas requires one sprinkler for every ____ of floor area if the design is by schedule.

The overall efficiency of an engine considering heat input and useful output is called:

In a diesel cycle, the ratio of cylinder volume at the end of combustion to that at the start of combustion is called:

The temperature at which air becomes saturated and condensation begins when cooled at constant pressure is called

The dimensionless number that characterizes natural convection due to buoyancy effects is the

The temperature bulb of the thermo expansion valve is attached to the

Flash point of a liquid fuel is the

Which turbine is best suited for medium head and medium discharge conditions?

The ratio of the sum of individual maximum demands to the maximum demand of the whole system is known as:

The weight of an empty container is known as:

Rods used in nuclear reactors to control the rate of fission are called:

A valve that allows fluid to flow in only one direction is known as a:

A valve primarily used for fully open or fully closed operation is a:

The typical operating speed range (rpm) of a Francis turbine is:

The standard pressure used in low-pressure steam systems is approximately:

Which refrigerant was widely used in air-conditioning systems before phase-out due to ozone depletion?

Which dimensionless number represents the ratio of buoyancy to viscous forces in natural convection?

The power developed in the engine cylinder as obtained from the pressure in the cylinder is called:

It is an instrument for determining brake power, usually by independent measurement of force, time, and distance through which the force is moved:

A boiler steam pressure gauge should have a range of at least ____ times the maximum allowable working pressure:

The knocking tendency in a spark ignition engine may be decreased by:

What does the second law of thermodynamics establish?

When a solid material is said to be “dry” it means that

It is applied to propulsion of vehicle because of certain practical characteristics

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

A means of throttling the leakage which would otherwise occur at the point of entry of the shaft into the casing.

Higher heating value when H2O in the product of combustion is in

Where groundwater (wells and springs) or surface water (streams and takes) are used for feedwater, water hardness of ___ and alkalinity of pH 10 to be ph should be considered

The ratio of the maximum to minimum mass steam flow rates at which the temperature can be accurately contained by the desuperheater.

The ratio of the actual to the ideal heat transfer coefficient.

PH of water varies with

For foundation of stacks, the maximum pressure on the soil is equal to the pressure due to the weight and the ________.

Protect the shaft where it passes through the stuffing box.

Is used to heat up the solution partially before entering the generator in absorption refrigeration system.

Chimneys that rely on natural draft are sometimes referred to as

The volumetric output of a centrifugal pump is reduced by closing a valve part way on the intake side of the pump, throttling the intake. The reduction of flow is accompanied by "popping" noises which seem to come from inside the case. What is the probable cause?

The phenomenon that warm air rise and cold air settle is called

_____ is obtained by mixing and burning precisely the right amount of fuel and oxygen so that products are left once combustion is complete.

Which code governs boiler design and safety?

A relative measure of the ability of a substance to cause an increase in the temperature of the atmosphere by absorbing solar and earth radiation that is relative to the effect of refrigerant 11.

In a mechanical steam trap, why is a float trap better at venting air than an inverted bucket trap?

A product of computer-aided manufacturing and precision machining were introduced commercially in the late 1980’s as replacements for reciprocating compressors in small residential air conditioners.

What is the effect of superheating steam on turbine work output?

What is the main effect of regeneration in a Rankine cycle?

Which property is used to calculate the availability of a system?

What is the purpose of a deaerator in the steam cycle?