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3RD TSSA PART A2 NEWEST EXAM STRUCTURED
QUESTIONS & CORRECT DETAILED ANSWERS WITH
RATIONALES
What is the peak-to-peak value of an alternating current if the rms value is 12 A? - CORRECT ANSWER >>> 33.94 A Electrostatic precipitators have an efficiency of greater than: - CORRECT ANSWER >>> 95% The purpose of the bolted-on jacket on some plug valves is to: - CORRECT ANSWER >>> Add heating to a non-jacketed existing valve. List the ways that butterfly valves can be installed into a piping system:
- Welded.
- Unions.
- Flanged.
- Wafer. - CORRECT ANSWER >>> 3, 4 Wet pipe sprinkler systems are found in:
- Office buildings.
- Stores.
- Manufacturing facilities.
- Hotels.
- Health care facilities. - CORRECT ANSWER >>> 1, 2, 3, 4, 5
Which of these is the "Boiler, Pressure Vessel and Pressure Piping Code"? **- CORRECT ANSWER
** CSA B The maximum temperature of fluids handled by a diaphragm valve must be below the temperature limit for the: - CORRECT ANSWER >>> Diaphragm material The most frequently used materials for power piping systems are:
- Inconel 800 H.
- Alloy steels.
- Low carbon steels.
- Galvanized steel.
- Austenitic stainless steels - CORRECT ANSWER >>> 2, 3, 5 In a magnetic circuit, the magnetic flux is the equivalent of electric _____ in an electric circuit. - CORRECT ANSWER >>> Current An insulating material may be defined as one which: - CORRECT ANSWER >>> Transmits heat poorly Clear definitions for terms and equipment relating to refrigeration and air conditioning equipment are defined in the _____. - CORRECT ANSWER >>> CSA-B Armature reaction _____ the main field of a generator. - CORRECT ANSWER >>> Distorts Viscosity of fuel oil _____ as the temperature increases and becomes nearly constant, above 120°C. - CORRECT ANSWER >>> Decreases
Calculate the minimum required thickness, in mm, for a blank, un-stayed, full-hemispherical head, with the pressure on the concave side. The head is fabricated from seamless material and is double butt welded to the shell. All reinforcement is removed and fully radiographed. The radius to which the head is dished is 700 mm, maximum allowable working pressure is 4000 kPa, and the head material SA-285 C will not reach a temperature greater than 340°C. Use S = 94.7 MPa (from 2004 Codes) - CORRECT ANSWER >>> 14.85 mm. The permit is an agreement between the issuer and the receiver that documents: - CORRECT ANSWER >>> All of the above. Safety committees should be established with representatives from: **- CORRECT ANSWER
** Management and plant workers. The work permit types that are most commonly used include: - CORRECT ANSWER >>> All of the above. The key points that will help to maintain the integrity and maximize the life of insulation include:
- It must not get wet, as wet insulation loses its insulating ability.
- The insulation should not be cracked or broken, as this will greatly reduce its effectiveness.
- The cladding must not be removed from the insulation, as the cladding holds the insulation in place, thereby protecting it from damage.
- Do not walk on the pipe and equipment, as this will damage the insulation.
- Be sure that all insulated boxes, covers and blankets are in place.
- Insulation requires painting every 3 years.
- Be sure that any damaged insulation is replaced as soon as possible; this prevents the loss of heat and allows moisture in to promote corrosion to the piping.
- Replace any missing insulation as soon as possible as personnel working in the area could be burned from the hot process fluids in the piping. - CORRECT ANSWER >>> 1, 2, 3, 4, 7, 8
In the case of the three-phase alternator, the coil windings are: **- CORRECT ANSWER
** Connected in three different groups, one for each phase If the condensate must be lifted to an over head return line the most common type of trap used is the _____ trap. - CORRECT ANSWER >>> Inverted bucket Doubling both the voltage and resistance in a circuit has what effect on the current? - CORRECT ANSWER >>> Current remains the same. Emergency Shut Down (ESD) devices are operated by:
- Air.
- Hydraulics.
- Solar energy.
- Nitrogen.
- Electricity.
- Natural gas. - CORRECT ANSWER >>> 1, 2, 5 "Valve trim" refers to the valve _____ and _____. - CORRECT ANSWER >>> Disc, seat If the resistance in a circuit was kept constant and the applied voltage was increased, there would be: - CORRECT ANSWER >>> A corresponding increase in current. Feed forward control: - CORRECT ANSWER >>> Adjusts the manipulated variable in response to changes in demand load An alternator is a/an: - CORRECT ANSWER >>> AC generator.
The practical unit used to represent resistance is: - CORRECT ANSWER >>> Ohm. The process of non-catalytic removal of NOx is the addition of _____ to the flue gas. - CORRECT ANSWER >>> Ammonia A valve where the handwheel and stem rise as the handwheel is turned is called a/an _____ valve. - CORRECT ANSWER >>> Inside screw threaded. Calculate the maximum allowable working pressure for a watertube boiler tube, which is 76 mm O.D. and has a minimum wall thickness of 3.25 mm. The tube is strength-welded into place in the boiler and is located in the furnace area of the boiler. Tube material is carbon steel, SA-192, with a mean wall temperature of 370°C. - CORRECT ANSWER >>> 6.6 MPa. The yoke in a DC machine is usually made of: - CORRECT ANSWER >>> Steel Calculate the thickness required for a dished seamless head, which is attached to a boiler having a shell diameter of 1200 mm. The head has a flanged-in manhole with one dimension equal to 160 mm. The head is a segment of a sphere with a dished radius of 1120 mm. The head material is SA-285 Grade C, the maximum allowable working pressure is 1930 kPa and the steam temperature does not exceed 260°C. Use S = 95 MPa. - CORRECT ANSWER >>> 27.257 mm. What is the peak-to-peak value of voltage with a maximum value 170 V? **- CORRECT ANSWER
** 340 V. Calculate the minimum required wall thickness of a boiler tube that is strength welded to a header. The maximum allowable working pressure is 4450 kPa, and the mean wall temperature is 370°C. The tube material is SA-192 and the outside diameter is 50 mm. **- CORRECT ANSWER ** 1.53 mm. In a purely inductive AC circuit the current: - CORRECT ANSWER >>> Lags voltage by 90 degrees.
Relay systems may cause circuit breakers to open due to changes in _____, _____ or _____. - CORRECT ANSWER >>> Frequency, voltage, current. What is the focus of the Engineers Regulations in a typical Boiler and Pressure Vessels Act? - CORRECT ANSWER >>> To state the minimum qualifications necessary to obtain each class of Power Engineer certification The maximum CO2 content of flue gas for coal is approximately: - CORRECT ANSWER >>> 19% The major advantage of plastic pipe is: - CORRECT ANSWER >>> Its resistance to corrosive materials The three principal components of a DCS operator station are:
- Video monitor.
- Telephone interface.
- Keyboard.
- Recording charts.
- Mouse/trackball - CORRECT ANSWER >>> 1, 3, 5 In a Hot Work Permit situation possible examples of sources of ignition are:
- Welding.
- Burning.
- Cutting.
- Grinding.
- Drilling.
- Internal combustion engines. - CORRECT ANSWER >>> 1, 2, 3, 4, 5, 6
- Has limited or restricted means for entry or exit that may complicate the provision of first aid, evacuation, rescue or other emergency response service.
- Is not large enough nor configured so a worker can enter to perform assigned work. - CORRECT ANSWER >>> 1, 3 What is the frequency of a wave that has a period of 2 μ sec? - CORRECT ANSWER >>> 0.5 MHz What determines the classification of the certificate of competency required for the role of chief power engineer? - CORRECT ANSWER >>> Kilowatt rating of the power plant. Thermowells are: - CORRECT ANSWER >>> Used to protect the bulb from erosion, corrosion and impact. What information will be found in the "Boilers and Related Components" of the B-51 code? - CORRECT ANSWER >>> Standards used in the design, construction, installation, inspection, testing, and repair of boilers. What is the main focus of the National Board of Boiler and Pressure Vessel Inspectors (NBBI)? - CORRECT ANSWER >>> To establish uniform qualifications for inspectors and acceptance of standard code requirements. High performance butterfly valves have: - CORRECT ANSWER >>> An eccentric shaft mounting What are the two main purposes of the CSA B-52 code?
- Terms and equipment relating to refrigeration and air conditioning equipment are defined.
- The various classifications of buildings and occupancies are listed and described with examples of each classification given.
- To provide for the safe design, construction, installation, operation and repair of refrigerating and air conditioning equipment and systems, and related equipment.
- To promote uniform requirements among the provinces and territories. - CORRECT ANSWER >>> 3, 4 Which of the following are criteria in steam trap selection?
- Condensate capacity, under start-up.
- Condensate capacity, under normal operating.
- Condensate temperature the trap will have to handle.
- Steam header temperature.
- Pressure differential across the trap.
- The location of the trap - CORRECT ANSWER >>> 1, 2, 3, 4, 5, 6 What are the rms values of voltage with a maximum value of 311 V? **- CORRECT ANSWER
** 220 V. What current will flow when a 10 μF capacitor is connected to a 240 V, 60 Hz supply? - CORRECT ANSWER >>> 0.9 A. The combustibles in fuel are:
- Hydrocarbons
- Carbon
- Nitrogen
- Sulphur
- Hydrogen - CORRECT ANSWER >>> 1, 2, 4, 5 Modern PLC's can:
_____ control operates to prevent errors from occurring in the first place. **- CORRECT ANSWER
** Feed-forward Which of the following could have a Class B fire? - CORRECT ANSWER >>> Oil tank. Consider all circuits to be alive unless one is certain that they are _____ and cannot by some human error be made _____. - CORRECT ANSWER >>> Dead, live. Loop alarms: - CORRECT ANSWER >>> May be audible and visible. Globe valves are used for:
- Throttling.
- Controlling fluid flow.
- Positive isolation.
- Quick opening.
- Abrasive fluids. - CORRECT ANSWER >>> 1, 2 An electric kettle is rated at 1500 W at 120 volts. The resistance would be: **- CORRECT ANSWER
** 9.6 ohms Factors determining the resistance of a conductor are: - CORRECT ANSWER >>> Type of material, length, diameter and temperature. Which type of welded flange is used for high pressure and extreme temperature service? - CORRECT ANSWER >>> Weld neck flange
The heating value of natural gas will vary according to its: - CORRECT ANSWER >>> Constituents The Occupational Health and Safety Act says that an employer, must do everything it reasonably can to protect the health and safety of its workers. This means:
- Equipment must be kept in safe working order.
- Dangerous chemicals must be properly labeled and stored.
- Safe work practices must be set up for workers and the employer must ensure these practices are followed.
- The employer must ensure that the workers have the skills and training needed to do their jobs safely.
- It is the employer's responsibility to inform its workers of any dangers at the job site.
- The employer must monitor workers who may be exposed to certain controlled products; in some cases, specific health examinations may be required. - CORRECT ANSWER >>> 1, 2, 3, 4, 5, 6 Low carbon steel has carbon content up to: - CORRECT ANSWER >>> 0.3% Calculate the required thickness, in mm, of a superheater outlet header, operating at 500°C and having a maximum allowable working pressure of 17 MPa. The header material is SA- 335 - P and the outside diameter is 457.2 mm. Use S = 61.7 MPa. - CORRECT ANSWER >>> 56.7 mm. Speed control is usually restricted to _____ motors:
- Series
- Shunt
- Residual
- Compounded - CORRECT ANSWER >>> 2, 4 Modern transformers are very efficient devices with large industrial transformers often better than _____ efficient. - CORRECT ANSWER >>> 95%
The procedure for the first responder at a fire should be:
- Sound the fire alarm.
- Complete a risk assessment of the situation.
- Attempt to extinguish, or control the fire.
- Turn away and leave the fire. - CORRECT ANSWER >>> 1, 2, 3 Iron and constantan can be used in a thermocouple to measure a temperature range of: - CORRECT ANSWER >>> - 210 to 1200°C What type of insulation will most likely be used for HP steam piping? **- CORRECT ANSWER
** Calcium silicate. Municipal wastes generally contain large amounts of _____ material that may be suitable for use as a fuel. - CORRECT ANSWER >>> Biomass One method of removing NOx requires injection of _____ in the presence of a _____. - CORRECT ANSWER >>> Ammonia, catalyst. The diverter valve operation can be described as: - CORRECT ANSWER >>> The valve may maintain a constant level of fluid in a vessel, if the inlet flow is too high when the level is at the maximum the excess input can be diverted to another vessel. The eccentric plug valve, is specially designed for: - CORRECT ANSWER >>> Severe rotary applications, as it features tight shut off with globe style seating Excitation of the shunt field is controlled by a: - CORRECT ANSWER >>> Regulating rheostat. Strainers are installed in steam lines: - CORRECT ANSWER >>> Before steam traps
A smoke detector will detect most fires much _____ than a heat detector. **- CORRECT ANSWER
** More rapidly. The assembled armature core of a DC machine: - CORRECT ANSWER >>> Has axial slots around its periphery. The heating value of fuel oil, expressed as kJ/kg, _____ with the specific gravity. - CORRECT ANSWER >>> Varies inversely In a direct-operating, electrically operated valve: - CORRECT ANSWER >>> The plunger is connected directly to the disc of a globe valve An absolute pressure gauge uses a/an _____ to sense the pressure. **- CORRECT ANSWER ** Bellows under vacuum. Process parameters may require recording in real time. Such recording may be captured using:
- Circular charts
- Enunciator panels
- Luminated indicators
- Strip charts
- DCS trends - CORRECT ANSWER >>> 1, 4, 5 In which of these ways can butterfly valves be installed into a piping system?
- Welded.
- Unions.
- Flanged.
100%. Assume the steam temperature will not exceed 400°C. - CORRECT ANSWER >>> 8. MPa. ________ was developed at the U.S. Naval Research Laboratory primarily to provide very rapid fire extinguishment or knockdown capabilities - CORRECT ANSWER >>> AFFF. If a conductor is moved relative to a magnetic field so as to "cut" the magnetic flux then a/an _____ will be induced in the conductor. - CORRECT ANSWER >>> Emf. Some of the characteristics of the series direct current motor include: 1. A small current at noload conditions.
- The danger of overspeed as the load is removed.
- The load current equals the excitation current.
- Its speed is directly proportional to field flux. - CORRECT ANSWER >>> 1, 2, 3 Which of the following characteristics will determine the strength of a pipe?
- Wall thickness
- Pipe length
- Material used
- Temperature to which it is subjected
- Whether seamless or welded - CORRECT ANSWER >>> 1, 3, 4, 5 Water hammer may occur in _____ lines.
- Steam
- Water
- Air
- Oil - CORRECT ANSWER >>> 1, 2, 4 The coefficient of expansion of aluminum is _____ that of copper. - CORRECT ANSWER >>> More than The quantity of current flow depends on: - CORRECT ANSWER >>> The intensity of the emf. The smart transmitter is a digital device, containing an on-board _____ complete with memory. - CORRECT ANSWER >>> Microprocessor The use of expansion bends is preferred for high-pressure service since: **- CORRECT ANSWER
** No maintenance is involved and there is little likelihood of leaks developing If carbon steel is used then the piping will be suitable for temperatures up to: - CORRECT ANSWER >>> 400 C There are two possible methods of connecting up three-phase generator windings. These are known as the _____ and the _____ connections. - CORRECT ANSWER >>> Star, delta. Before commencing work on locked out equipment, a/an _____ must verify that all energy sources have been effectively locked out. - CORRECT ANSWER >>> Worker A MSDS is a technical document which provides detailed and comprehensive information on a controlled product related to: 1. Health effects of overexposure to the product. 2. Hazard evaluation related to the product's handling, storage and use. 3. Measures to protect workers at risk of overexposure.
