In an lpg and gasoline loading facility, the pumps are equipped with a flow switch that is usually installed in the pump discharge line and serves to:

A - Start the pump B - Shut down the pump on a low flow condition C - Ensure continuous discharge flow D - Prevent backpressure build-up

Question 4:

Trucks hauling gasoline are generally loaded through a top opening at:

A - Temperatures over 23°C B - High pressure C - Atmospheric pressure D - Altitudes over 1500 meters Question 5:

LPG cylindrical storage tank heads are made:

A - Spherical B - Semi-ellipsoidal C - Torispherical D - Hemispherical

Question 6:

Why can a spherical tank be made from thinner material than any other shape having the same diameter?

A - Because the stresses are diffused by a set of internal baffles radiating from the gauging device B - Because the stresses are focussed linearly, aiming the stress at points reinforced by the supporting structure C - Because the stresses are uniform throughout the shell plates when subjected to an internal pressure D - Because gravity centres the contents of the sphere, creating a universal thrust that acts equally on all shell plates

Question 7:

What must happen to product stored in underground storage caverns before it can be sold and why?

A - It must be cycled through a heater treater to remove the water entrained during storage B - It must be dried because it becomes saturated with water during the storage period C - 30% must be flared to remove the residual salt absorbed during storage D - It must be desalinated through a Claus process to remove the saturated brine

Question 8:

As soon as the truck stops at the loading rack the grounding wire must be connected and must remain connected until the operation is complete. The loading line and swing spouts must be electrically bonded to the:

A - Grounding system B - Truck C - Pump base foundations D - Loading rack

Question 9:

On a loading rack for railway tank cars, each spout is equipped with a means for introducing mercaptan when the product must be:

A - Stenched B - Oxygenated C - Carbonated D - Off-loaded at a port facility

Question 10:

Most LPG products are odorized with a small amount of:

A - Sodium hydroxide B - Ethyl mercaptan C - Hydrogen sulphide D - Ammonia

Question 11:

LPG products have a vapour pressure above atmospheric pressure and must be:

A - Vented to prevent static electricity build-up B - Loaded under pressure C - Loaded to reduce agitation of the product D - Loaded at atmospheric pressure

Question 12:

The purpose of an LPG pressure system is to ensure that a constant pressure is maintained in the storage tank. What is the function of the vapourizer?

A - To vapourize any water in the stored LPG B - To reduce the vapour in the system which maintains constant pressure C - To produce sufficient vapour to maintain a constant pressure in the system D - To avoid excessive pressure build up in the system

Question 13:

All of the following fittings are required in high pressure LPG storage except:

A - Inlet and outlet connections B - Drains, vents, and sample joints C - Inspection openings D - Sour service fittings

Question 14:

Large surface ponds are necessary to hold saturated brine that is used in the operation of a washed cavern. What environmental safeguard is necessary for those ponds?

A - All fish are subject to catch-and-release regulations B - They must be lined with heavy plastic C - Warning signs must be posted to guard against human use D - They must be fenced off to prevent waterfowl from landing in them

Question 15:

You have been asked to design a pump that will create enough pressure to pump propane (R.D. = 0.5) into a storage cavern containing brine (R.D. = 1.2) 1800m below the surface. What will be the approximate pressure that the pump will need to overcome in order to get the propane into the storage cavern? (Use the formula: P = ρgh)

A - 3 000 kPa B - 1 500 kPa C - 18 000 kPa D - 13 000 kPa

Question 16:

The pressure required to pump propane having a relative density of 0.5 into a cavern at a depth of 2,500 meters that is filled with brine having a relative density of 1.3 is: (Use the formula P = ρgh)

A - 9,000 kPa B - 19,700 kPa C - 25,000 kPa D - 18,000 kPa

Question 17:

The pressure required to pump propane having a relative density of 0.5 into a cavern at a depth of 3 000 meters that is filled with brine having a relative density of 1.4 is: (Use the formula: P = ρgh)

A - 26 500 kPa B - 18 000 kPa C - 55 850 kPa D - 15 000 kPa

Question 18:

When tank trucks are being loaded, why must the loading spout be extended so that it is only a few inches above the bottom of the tank?

A - To reduce noise while loading B - To reduce the likelihood of evaporation while the tank is being loaded C - To ensure that the tank is evenly filled D - To reduce agitation of the product which produces static electricity Question 19:

Washed caverns that are used for storage of LPG are underground:

A - Sandstone formations B - Reefs C - Salt deposits D - Carbonate rock formations

Question 20:

Acceleration due to gravity (g) is equal to:

A - 9.81 m/s2 B - 98.1 m/s2 C - 981 m/s2 D - 0.981 m/s2

Question 1:

The particular design of a refrigeration system will be mainly dictated by all of the following factors except:

A - Recovery desired B - Gas analysis C - Outlet gas pressure D - Inlet gas pressure

Question 2:

The function of a refrigeration condenser is to:

A - Remove the evaporator heat and the heat of compression from the refrigerant B - Adsorb latent heat from the inlet gas stream C - Remove only the evaporator heat from the refrigerant D - Remove only the heat of compression from the refrigerant

Question 3:

Cascade systems consist of two or three separate, simple stages (single component refrigeration units) operating in conjunction with each other at different temperature levels. The connecting point is the:

A - Heat exchanger between the stages B - Low stage booster C - High stage evaporator coil D - Low stage condenser

Question 4:

The part of the shell and tube condenser shown in the illustration labeled "E" is called the:

A - Liquid line B - Cooling water outlet C - Cooling water inlet D - Hot vapour outlet

Question 5:

The most common refrigerant used in a gas plant is:

A - Methane B - Butane C - Propane D - Ammonia

Question 6:

Reciprocating refrigeration compressors are:

A - Constant volume, variable head machines B - Variable volume, variable head machines C - Constant volume, constant head machines D - Variable volume, constant head machines

Question 7:

The part of the shell and tube condenser shown in the illustration above labeled "B" is called the:

A - Cooling water outlet B - Cooling water inlet C - Hot vapour line D - Liquid line

Question 8:

The economizer, is located in the liquid propane supply to the chillers. It reduces the compressor requirements by as much as 20% by:

A - Regenerating the liquid before it commences its chilling duties B - Pressurizing the liquid before it commences its chilling duties C - Heating the liquid before it commences its chilling duties D - Cooling the liquid before it commences its chilling duties

Question 9: The most commonly used condenser in a propane refrigeration system is the:

A - Shell and tube type B - Two pipe type C - Kettle type heat exchanger D - Aerial cooler

Question 10:

The purpose of the expansion valve in a refrigeration system is to:

A - Isolate the surge drum B - Control the level in the surge drum C - Control the level of refrigerant in the chiller shell D - Prevent any liquid propane from entering the chiller Question 11:

The propane refrigeration system compressor increases the:

A - Pressure of the liquid propane refrigerant B - Temperature of the refrigerant liquid from the economizer C - Condensing temperature of the propane refrigerant D - Temperature of the liquid propane refrigerant

Question 12:

The atmospheric pressure boiling point of propane is:

A - -30 degrees C B - +48 degrees C C - -33 degrees C D - -42 degrees C

Question 13:

An economizer is designed to lower the temperature of the liquid refrigerant by:

A - Flashing or by condensation B - Flashing or by reboiling C - Flashing or by heat exchange D - Reboiling by heat exchange

Question 14:

All of the following are components of a refrigeration unit except:

A - Chiller and throttling valve B - Suction scrubber C - Inlet gas valve D - Compressor and driver

Question 15:

An advantage of using propane as a refrigerant in a gas plant is that it:

A - Is readily available B - Is cost effective C - Has a good operating range D - All of the above

Question 16:

Refrigerator system compressor lubricating oil tends to accumulate in the condenser from which it must be removed:

A - True B - False

Question 17:

Surging of a centrifugal refrigeration compressor can be prevented by:

A - Throttling the discharge valve and increasing the pressure differential across the impeller B - Recycling some of the discharge gas back into the suction when the flow becomes low C - Opening a vent to atmosphere when the compression gets close to maximum capacity D - Throttling the suction to the compressor to prevent the pressure from becoming too high

Question 18:

A disadvantage of using propane as a refrigerant in a gas plant is it:

A - Is corrosive B - Has inadequate thermodynamic qualities C - Is inflammable and explosive when mixed with air D - Has an offensive odor and is toxic Question 19:

The chief disadvantage of cascade staging is the overlap of refrigerant temperatures in the:

A - High stage evaporator coil B - Cascade condenser C - Low stage compressor D - Low stage condenser

Question 20: