Chief Stationary Engineer Exam

you got this dad :)

The capacity of a water-cooled condenser is LEAST affected by the

surrounding air temperature

The type of refrigeration system MOST commonly used in ice-skating rinks is the system.

simple secondary

The theoretical amount of refrigeration required to freeze one ton of water from 66F to ice at 28F in one day is____tons

1.25 tons

The brine solution MOST commonly used in ice-skating rink piping, as a freezing medium, is a mixture of water and

calcium chloride

In an absorption refrigeration system, latent heat is absorbed by the refrigerant in the

evaporator and the generator

Of the following refrigerants, the one which has the HIGHEST evaporator pressure at the standard 5F temperature is

carbon dioxide

The cooler in a refrigeration system that is equipped with automatic protective devices is MOST likely to be accidentally damaged by water freeze-up when the

system is being pumped down

The one of the following statements pertaining to refrigerant compressor lubricants that is NOT true is that

freon 12 causes very little viscosity change in lubricating oil

The one of the following capacity controls which is USUALLY found in a refrigerant reciprocating-compressor system is a

suction valve unloader

A thermostatic expansion valve is connected to an evaporator operating at 5F and 11.8psig. The valve is in equilibrium at 10 superheat, and the pressure in the bulb is 17.7psig. The EQUIVALENT valve-spring pressure on the refrigerant side of the sensitive element is_____ psi.

5.9psi

A pressure gage on a compressed air tank reads 35.3 psi at 70F. If, due to a fire, the temperature of the air in the tank were to increase to 600F, the gage reading should be MOST NEARLY ________psi

85 psi

An ADVANTAGE that variable-speed control of a fan has over damper control is

lower power consumption

An intercooler is used on a two-stage air compressor to reduce the

work done on the air in the second stage

Of the following, the BEST instrument to use to measure small pressure differentials at low pressure is the

inclined manometer

A modulating pressurtrol on a boiler should contain a

potentiometer

Of the following automatic refrigerant expansion valves, the one which can only be used in a system where the liquid refrigerant can largely be stored in the evaporator without danger of sending slugs of liquid refrigerant over to the compressor is the _______ valve.

high-side float

The refrigerating effect of a fluid is measured by the amount of heat it is capable of absorbing from the time it enters the

evaporator as a liquid and leaves as a vapor

The one of the following which lists the refrigerants is CORRECT order of decreasing toxicity is:

Sulphur dioxide, ammonia, freon 12

The one of the following methods which would MOST likely be used to control the capacity of a large centrifugal refrigerant compressor is the _______ method.

variable speed

On a hot summer day, the GREATEST number of people working in a large air-conditioned office would feel comfortable if the temperature and relative humidity were maintained at

77F and 50%

The one of the following conditions which has the GREATEST effect on the suction pressure on a swimming pool circulating pump is a

clogged hair and lint strainer

A coagulant used in swimming pool filters is

alum

According to the health code, the PH reading of swimming pool water should be between _______ and _______

7.8 and 8.4

An orthotolidine test is made to find out how much of which substance is contained in a sample of water?

Chlorine

The MINIMUM air temperature which must be maintained in an indoor swimming pool, except during the summer months, is ____F.

75F

A permit is required for the storage or use of liquid chlorine. This permit is issued by which city agency? The

Fire Department

The MINIMUM amount of free chlorine that swimming pool water should contain for proper disinfection is _____ part(s) per million

1.0 part per million

The agency which approves gas masks suitable for use in high concentrations of chlorine gas is the United States

Bureau of Mines

The daily operational records of swimming pools which are required by the health code must be kept for a period of AT LEAST

six months

The one of the following which is NOT used as a filtering media in swimming pool filters is

clay

The point at which swimming pool filters should be back-washed is when the difference between the inlet and outlet pressure EXCEEDS _______psi.

10psi

Of the following valves, the type which can be used to adjust the rate-of-flow in a swimming pool filter is the _____ valve

butterfly

When the coagulant in a swimming pool filter fails to jelly, the MOST likely cause of the failure is

insufficient alkalinity of the water

Of the following types of flow meters, the one that is MOST accurate is a

venturi tube

A spring pop safety valve on a fired high-pressure boiler fails to pop at its set pressure. Which of the following methods should be used to free the valve before retesting it?

Raise the valve lifting-lever and release it

A device which retains the desired parts of a steam and water mixture while rejecting the undesired parts of the mixture is a

steam trap

The PRIMARY purpose of using phosphate to treat boiler water is to

precipitate the hardness constituents

The efficiency of a riveted joint is defined as the ratio of the

strength of the riveted joint to the strength of the solid plate

A pump delivers 1500 pounds of water per minute against a total head of 200 feet. The water horsepower of this pump is MOST NEARLY

10 HP

A centrifugal water pump is direct-driven by a 25 HP 900 RPM electric motor at rated load. In order to double the quantity of water delivered, it would be necessary to substitute a motor rate at _____ HP at _____ RPM.

200 HP at 1800 RPM

Of the following fire extinguisher ratings, the one which indicates that an extinguisher has the GREATEST capability for extinguishing wood, paper, and electrical is

4-A 4-B C

Of the following combinations of oil burners and fuel oils, the combination which is the MOST hazardous to fire-up when placing a cold boiler into service is the

mechanically-atomized burner firing heavy oil

It is usually desirable to have a program which will create and maintain the interest of workers in safety. Of the following, the one which such a program CANNOT do is to

compensate for unsafe procedures

Because of a ruptured ammonia tank, the concentration of ammonia gas in a room exceeds 3%. The wearing of a gas mask, as the only protective device, by a person entering the room is

not recommended, because the ammonia will severely irritate the skin

The Occupational Safety and Health Act of 1970 provided for

employees’ right to review a copy of a safety citation against the employer

An aftercooler on a reciprocating air compressor is used PRIMARILY to

condense the moisture in the compressed air

The one of the following tasks which is an example of preventive maintenance is

cleaning the cup on a rotary cup burner

The four MAIN causes of failure of the three-phase electric motors are

dirt, friction, moisture, vibration

The one of the following electrical control components that may be lubricated is the

drum controller’s copper-to-copper contacts

In the planning of a preventive maintenance program, the FIRST requirement is to

inventory the equipment

Of the following, the one that is an inherent boiler heat loss is the loss due to