📝 [ME] QB ID: 0418 | Essential & Supplementary Elements | Set 16

Reheating process is normally employed in steam plane when:

The ratio of the average load during a certain time to peak the load occurring during the same period of time is called:

If R is the delivery rate of a pump. H is the total pumping head and e is the efficiency of the pump, then compute the power required to drive the pump.

The constant spending of certain percentage of circulated water in a cooling tower in order to prevent accumulation of dissolved mineral solids and other impurities in the condenser water is called:

What process is employed when the turbine steam power plants experience excessive moisture?

There are three basic boiler types, namely:

What will happen when the pressure at any point inside a centrifugal pump goes below the vapor pressure corresponding to the temperature of the liquid?

What does a negative Joule-Thompson coefficient means during a throttling process?

For steam power plants, increasing the operating pressure of the boiler will:

If the average temperature liquid of power cycle during heat addition process is as high as possible, then the thermal efficiency of the cycle will:

Where does the final removal of water vapor in an absorption refrigeration system occur?

Ice cubes added to a glass of water and stirred. Moisture starts to form on the outer surface of the glass. At his point. what is the temperature at the outer surface called?

One foot water is equal to:

The freezing point of R – 22 is:

What is the temperature of lubricant at which it will ignite thus limit its application?

The pump will not cavitate if the available Net Positive Suction Head (NPSH) is:

What is the heat that is removed from the space to be cooled, which is the same as the heat absorbed by the cooling coils?

Based on the PSME Code, what should be the effective temperature of the air to be maintained for comfort cooling at an air movement from 0.0761 to 0.127 meter per second?

An air conditioning system in where the water is chilled or cooled and which passes the evaporator coils.

When an electric motor nameplate indicates a “100- kW electric motor”, then what does a 100- kw rating refers to?

What is the specific gravity of an oil which has a Baume reading g of 28 degrees F?

If C is the capacity of the compressor in a refrigeration system and F is the heat rejection factor, then calculate the condenser load, L.

A multi-stage refrigeration system which is realizable in using different refrigerants.

Compute the wall gain load of a load storage room when A is the outside surface area of the wall. D is the temperature differential across the wall, and U is the overall coefficient of heat transition.

Very large pipe diameter means a thicker wall and high cost. It also means:

What type of fuel is used with stationary power plants where gas is available by pipeline?

Wb is shaft work of an engine and Wi is the indicated work of an engine. If mechanical friction is present in the engine mechanism, then:

What is the saturation pressure at the critical temperature, or the lowest pressure in which a substance can be in the liquid state at its critical pressure?

Aside from maintaining appropriate temperature for food cold storage, how is desiccation minimized or decreased?

If a gas possess internal energy, then it is due to its:

During combustion process, only limited air is supplied and not enough to supply two molecules of oxygen per one molecule of carbon, then the product is:

If a Carnot cycle is at the same maximum and minimum temperatures as a Rankine cycle. then how would you compare the efficiency of a Rankine cycle to that of the Carnot cycle?

What is the method used to evaluate all welds performed on pressure parts of boiler tube materials?

If the pressure is disregarded in the various other components of a steam of gas power plants, the pressure rise in the pump or compressor is _____ to the pressure drop in the turbine.

If m is the mass of dry air and H is the specific enthalpy of the water vapor in air and r is the humidity ratio, then determine the latent heat of any dry air.

As far as combustion chamber design is considered, the maximum power output of a given engine can be increased by:

The pressure of ammonia was detected in brine solution. How can ammonia be removed?

A water conservation device which employs both air and water is condensed a condenser and cooling tower combined into one is called:

If W is the work output of a heat engine and H is the total heat input of an engine. then determine its thermal efficiency, e.

The dew point temperature of the product of combustion in the saturation temperature that corresponds to the partial pressure of the _____ in the products.

What do we call a device that is used to boiler operation that will stop the burner or at least send a signal to the operator if the water drops to a low level that is no longer safe?

What must be the value of the available Net Positive Suction Head (NPSH) of a centrifugal pump compared to its require NPSH to avoid losing priming?

ln Stirling and Erickson Cycles, the efficiency can be increased by:

Which of the following is used to control refrigeration compressor capacity?

ln order to perform efficiently, a power cycle must be communicated with the outside temperature of its surroundings and into one is called:

Compare the temperature of discharge vapor refrigerant leaving the compressor for a superheated cycle and the saturated cycle. for the same condensing temperature and pressure.

A valve that releases steam from the boiler by opening at a pre-determined pressure in order to keep the steam pressure from rising more than the pressure from which the valve is set is called a:

Water is heated in a container. lt expands and becomes less dense and lighter. lt rises up the container because of its reduced density and replaced by cooler air. As this process continues, the heat is transferred and disturbed all throughout. What is this mode of heat transfer called?

For a hydraulic power to be transmitted at its maximum what should be the value of loss of head due to friction if H is the total available head?

The amount of heat necessary to bring up the temperature of a unit mass of a substance through a unit degree is called:

When required, a regulator water valve in refrigerating system should be:

What is the pressure present inside the casing of an impulse turbine?

Which of the following fans in air conditioning systems which can be classified as centrifugal flow?

Based on the PSME Code, what should be the humidity of air to be used for comfort cooling?

What is the cause of pressure drop in the boiler, condenser and the pipings between different Components? Because of this drop, steam leaving the boiler is at a lower pressure.

When there is no work between the thermodynamic system and its surrounding, the quantity of net heat transfer is equal to:

It is used to deliver widespread, fan shaped flows of air into the room.

If V₃ is the cylinder volume after the combustion process of 8 Diesel cycle and V₂ is its cylinder volume before combustion, then calculate the cut-off ratio, r.

In order to attain equilibrium in the condenser, the cooling tower range must be _____ with respect to temperature rise in the condenser.

lf E_t is the total net energy generated by a plant in a certain period of time and E_r is the rated net energy capacity of the plant during the same period of time then what is the plant operating factor?

What does enthalpy measure in a substance?

Pneumatic tools are powered by:

The force when applied to a mass of one kilogram will give mass an acceleration of one meter per second for every second called:

The kinetic energy of a moving fluid is used to isentropically compressed the fluid to state of zero velocity. The temperature of a moving fluid at the state zero velocity is called:

A water-tube condenser has a total of 60 tubes. If these are two passes, then compute the number of tube per pass.

If ice will form in a solution of water and salt, then it is at a temperature called:

What is likely to occur when sections of the impeller of a centrifugal pump are handling vapor and other sections are handling liquid?

When vapor compression takes place on one side of the piston and one during one revolution of the crankshaft, then the compressor is:

The flow of the convergent section of a nozzle is always subsonic. If the flow is subsonic then the mach number is:

The ratio of the average load to that of the rated capacity of a plant is called:

Horsepower per ton of refrigeration is expressed as:

What is the effect on saturated temperature if the pressure of the fluid is decreased?

One hundred twenty percent theoretical air was supplied for combustion. What is the equivalent excess equal to:

Dry analysis is a fractional analysis of the products of combustion which does not include:

What is the relationship of the horsepower of a centrifugal pump, Hp, to the impeller speed, S, if the pump is at two different rotative speeds?

The size of a reciprocating pump is stamped on the builder’s plate 3″ x 4″ x 6′. The diameter of the liquid cylinder is:

If Pi is the indicated horsepower and Pb is the indicated horsepower of a compressor, then what is mechanical efficiency, Em, equal to:

If the air is compressed without discarding heat, then what do you call this kind of compression?

What is the least number of compressor a multistage system that will use?

When coil surface temperature is below the dew point of the air.

Nitrogen occupied almost how much of the Earth’s Atmosphere.

Which of the following is converted to mechanical energy by a water?

The relation between the Fahrenheit absolute scale and the Celsius absolute scale is:

What is the relationship of the capacity of a centrifugal pump, Q, to impeller diameter. D, when there are two impeller diameters in the same pump?

If W_t is the turbine shaft work of a gas turbine unit, W_c is its compressor shaft work and Q is the heat supplied in duel, then determine its thermal efficiency.

The sum of the internal energy and the product of pressure and specific volume is known as the:

Boiling temperature of Freon 22 is:

Which of the following is a type of evaporator?

For Brayton cycle. the result of regeneration is:

If the pressure exerted on a liquid is higher than the saturation corresponding to its temperature, the liquid is a:

In a power-driven pump, each piston stroke is displaced by 360° divided the _____.

A refrigeration control that guards the compressor form overloads brought about by abruptly increases loads resulting from defrosting, warm products and others, is called:

What is the significance of a high dielectric strength of lubricating oil?

Theoretically. what is the effect of the compressor clearance on horsepower?

Compare the refrigerating effect per unit mass of refrigerant circulated for a superheated cycle that produces useful cooling and a saturated cycle. for the same vaporizing and condensing temperature.

The psychrometric chart in air conditioning determines the:

Which of the following is considered as comfort condition in air conditioning?

What does fossil-fuel fired power plants release, which in turn produces the key ingredient in acid rain?

The fraction of the radiation energy incident on a surface which is absorbed by the surface is called:

Which of the following power plants uses energy from uranium to produce electric power?

The schedule number of a pipe, N, indicates the thickness of the pipe wall. If the allowable stress of the pipe is S, then what is the internal pressure equal to?

In order to remove the fly ashes from the flue gas, which of the following must a power plant be equipped with?

If H_s is the total suction head of a pump, H_p is its suction surface pressure, and Hf is its suction friction head, then calculate the total suction head, H_t.

It is important to take some moisture from the air to dehumidify it if the relative humidity reaches high levels. To do this, it requires cooling the air:

if E_v is the volumetric efficiency of a reciprocating pump, then determine SLIP which represents all losses of capacity given in percentage of the displacement.

A company is interested to produce a water turbine wherein only little energy is required or necessary because the guide vanes are to be controlled. The turbine must be a:

What is the usual COP of a domestic refrigerator?

During a cooling and dehumidifying process, sensible and latent heats are removed in the cooling coil. If H_s is the sensible heat and H_t is the total heat transferred. then determine the coil sensible factor.

Based on PSME code, what should be provided in each stream outlets if two or more boilers will be connected in parallel?

Concrete foundation should have steel bar reinforcements placed vertically and horizontally to avoid _____.

The motor condition of an air conditioning unit can be checked with:

The empirical coefficient e in machine foundation if not given is assumed:

Foundations bolt length should be at least how many times the anchor bolt diameter?

The high pressure of refrigeration system consists of the line to the expansion valve, the receiver, the uppermost half of the compressor and the:

The diesel cycle is the ideal cycle for a: