151-200

Question 1

151. Which of the following is the most important consideration in a fire prevention program?

a) Train the staff to place flammable in fireproof containers
b) Know how to attack fires regardless of size
c) See that halls, corridors, and exits are not blocked
d) Detect and eliminate every possible fire hazard

Answer 1

d) Detect and eliminate every possible fire hazard

Question 2

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

a) Pump tank type
b) Cartridge actuated type
c) Soda acid type
d) Foam type

Answer 2

d) Foam type

Question 3

153. Which of the following are the four stages of the warning system designated by the high air pollution alert warning system?

a) Initial, chronic, acute, penetrating
b) Forecast, alert, warning, emergency
c) light, medium, heavy, extra heavy
d) Early, moderate, severe, toxic

Answer 3

b) Forecast, alert, warning, emergency

Question 4

154. The chemical most commonly used to speed sedimentation of sewage is known as:

a) Lime
b) Copper sulfate
c) Sulfuric acid
d) Methylene blue

Answer 4

a) Lime

Question 5

155.Most of the bacteria in sewage are:

a) Saprophytic
b) Dangerous
c) Parasitic
d) Pathogenic

Answer 5

a) Saprophytic

Question 6

156. One of the two types of non-material nuclear radiation is:

a) Gamma radiation
b) Transmutation radiation
c) Walton radiation
d) Betatron radiation

Answer 6

a) Gamma radiation

Question 7

157. Which of the following is not a qualification for an applicant for ME board examination?

a) A certified plant mechanic
b) At least 18 years old
c) A holder of BSME degree
d) A citizen of the Philippines

Answer 7

a) A certified plant mechanic

Question 8

158. A thermo hydraulic feed water regulator is used to regulate the flow of water to a drum type boiler. The amount of water input to the boiler is controlled in proportion to the:

a) Boiler load
b) Setting of the feed pump relief valve
c) Amount of water in the outer tube that flashes into steam
d) Water level in the drum

Answer 8

d) Water level in the drum

Question 9

159. The standard capacity rating conditions for any refrigeration compressor is:

a) 50F, 19.6 psig for the suction 860F, 154.5 psig for the discharge
b) 50F, 9.6 psig for the suction 960F, 154.5 psig for the discharge
c) 100F, 9.6 psig for the suction 960F, 144.5 psig for the discharge
d) 50F, 19.6 psig for the suction 960F, 134.5 psig for the discharge

Answer 9

a) 50F, 19.6 psig for the suction 860F, 154.5 psig for the discharge

Question 10

160. In accordance with the air pollution control code, no person shall cause or permit the emission of air contaminants from a boiler with a capacity of 500 million BTU sulfur dioxide content of more than:

a) 300 parts per million by volume undiluted emissions measured at 15 percent excess air
b) 200 parts per million by volume of undiluted emissions measured at 10 percent excess air
c) 200 parts per million by volume undiluted emissions measured at 15 percent excess
air
d) 300 per million by volume undiluted emissions measured at 10 percent excess air

Answer 10

b) 200 parts per million by volume of undiluted emissions measured at 10 percent excess air

Question 11

161. Assume that one of your assistances was near the Freon 11 refrigeration system when a liquid Freon line ruptured. Some of the liquid Freon 11 has gotten into your assistant’s right eye. Of the following actions, the one which you should not take is to:

a) Immediately call for an eye doctor specialist (medical doctor)
b) Gently and quickly rub the Freon 11 out of the eye
c) Uses a boric-acid solution to clean out the Freon 11 from his eye
d) Wash the eye by gently blowing the Freon 11 out of his eye with air

Answer 11

b) Gently and quickly rub the Freon 11 out of the eye

Question 12

162.As compared to a power-driven triplex single-acting pump of the same size and operating at the same speed, a steam-driven duplex double-acting pump will:

a) Pump more water per minute
b) Give a more uniform discharge
c) Have a higher first cost
d) Be more economical to operate

Answer 12

a) Pump more water per minute

Question 13

163.It is a device commonly used to cool condenser water in Power and Refrigeration plants. The function of which is to reject heat to the atmosphere by reducing the temperature of water circulated through condenser or other heat rejection equipment. What is this device commonly called?

a) Condenser
b) Cooler
c) Cooling tower
d) Evaporator

Answer 13

c) Cooling tower

Question 14

164. It is a type of dryer in which the gases of combustion pass through the spaces surrounding, or in other ways heating, the drying chamber, but the gases are not allowed in contact with the material being dried. What is this dryer?

a) Direct-heat type dryer
b) Indirect-heat type dryer
c) Steam-heated type dryer
d) Rotary Dryer

Answer 14

b) Indirect-heat type dryer

Question 15

165. In a refrigeration system, which of the following would cause a high suction pressure?

a) Expansion valve not open wide enough
b) Expansion valve open too wide
c) King valve not open wide enough
d) Dirty dehydrator

Answer 15

b) Expansion valve open too wide

Question 16

166. In the deep well installing or operation, the difference between static water level and operating water level is called:

a) Suction lift
b) drawdown
c) priming level
d) clogging

Answer 16

b) drawdown

Question 17

167. Which of the following is a characteristic of an impulse turbine?

a) Steam striking blades on angle
b) No steam reaction to velocity
c) Steam striking blades at zero angle
d) Steam reversing direction

Answer 17

c) Steam striking blades at zero angle

Question 18

168. Gas produced by the combustion of fuel oil and cannot be found in the flue gases is:

a) Carbon dioxide
b) Hydrogen
c) Oxygen
d) Nitrogen

Answer 18

b) Hydrogen

Question 19

169. Scale in boiler can:

a) Create low steam quality
b) Cause foaming
c) Overheat blow off line
d) Inhibit circulation and heat transfer

Answer 19

d) Inhibit circulation and heat transfer

Question 20

170. The effectiveness of a body as a thermal radiator at a given temperature:

a) Absorptivity
b) Emissivity
c) Conductivity
d) Reflectivity

Answer 20

b) Emissivity

Question 21

171. To protect adequately the engine bearings, what type and better arrangement of lubricating oil filter is most practical?

a) Full flow type filter installed between the lubricating oil pump and bearings
b) Splash lubricating system in the crank case
c) Duplex filter installed before the lubricating pump
d) Bypass filter with cleanable and replaceable elements

Answer 21

a) Full flow type filter installed between the lubricating oil pump and bearings

Question 22

172. When the expansion or compression of gas takes place without transfer of heat t or from the gas, the process is called:

a) Reversible
b) Adiabatic
c) Polytrophic
d) Isothermal

Answer 22

b) Adiabatic

Question 23

173. Which of the following is other name for the liquid valve?

a) Freon valve
b) shut off valve
c) King valve
d) Master valve

Answer 23

c) King valve

Question 24

174. In accordance with recommended maintenance practice, thermostats used in a pneumatic temperature control system should be checked:

a) Weekly
b) Bi-monthly
c) Monthly
d) Once a year

Answer 24

d) Once a year

Question 25

175. Of the following, the best method used to determine the moisture level in a refrigeration system is to: a) Weigh the driver after it has been in the system for a period of time b) Use a moisture indicator c) Visually check the sight glass for particles of corrosion d) Test a sampler lubricating oil with phosphorus pentoxide

Answer 25

b) Use a moisture indicator

Question 26

176.A full-flow drier is usually recommended to be used in in a hermetic refrigeration compressor system to keep the system dry and to: a) Prevent the products of decomposition from getting into the evaporator in the event of motor burn-out b) Condense out liquid refrigerant during compressor off cycles and compressor start-up c) Prevent the compressor unit form decreasing in capacity d) Prevent the liquid from dumping into the compressor crank-case

Answer 26

a) Prevent the products of decomposition from getting into the evaporator in the event of motor burn-out

Question 27

177. You are supervising the installation of a steam-driven reciprocating pump. The pump's air chamber is missing and you have to replace it with one of several salvaged ones. The salvaged air chamber selected should have a volume equal to, most nearly, a) Half of the position displacement of the pump b) 11⁄2 times the position displacement of the pump c) 2 times the piston displacement of the pump d) 2 1⁄2 times the piston displacement of the pump

Answer 27

d) 2 1⁄2 times the piston displacement of the pump

Question 28

178. Economical partial-load operation of steam turbines is obtained by minimizing throttling losses. This is accomplished by: a) Reducing the boiler pressure and temperature b) Throttling the steam flow into the uncontrolled set of nozzles c) Dividing the first-stage nozzles into several groups and providing a steam control valve for each group d) Controlling the fuel flow to the steam generator

Answer 28

c) Dividing the first-stage nozzles into several groups and providing a steam control valve for each group

Question 29

179.How do you compare superheated steam to that of saturated steam at the same pressure? a) Contains more heat energy b) Has a greater enthalpy of evaporation c) Has a smaller specific volume d) Condenses at a higher temperature

Answer 29

a) Contains more heat energy

Question 30

180. Which of the following is not characteristic of superheated steam? a) It contains no water droplets b) It causes severe erosion in pipes c) It may cause uneven heating of a product d) It has a temperature greater than 165C

Answer 30

b) It causes severe erosion in pipes

Question 31

181.Superheated steam at a pressure of 6 bar g: a) Has a larger Specifc heat capacity than water b) Has a dryness fraction of 0.99 c) Must not be used as a heat transfer medium d) Has a temperature greater than 165 oC

Answer 31

d) Has a temperature greater than 165 oC

Question 32

182.Of the following, the main purpose of a sub- cooler in a refrigerant piping system for a two-stage system is to: a) Reduce the total power requirements and total heat rejection to the second stage b) Reduce the total power requirements and return oil to the compressor c) Improve the flow of evaporator gas per ton and increase the temperature d) Increase the heat rejection per ton and avoid system shutdown

Answer 32

a) Reduce the total power requirements and total heat rejection to the second stage

Question 33

183.In large refrigeration systems, the usual location for charging the refrigeration system is into the: a) Suction line b) Liquid line between the receiver shut-off valve and the expansion valve c) line between the condenser and the compressor d) line between the high-pressure cut-off switch and the expansion valve

Answer 33

b) Liquid line between the receiver shut-off valve and the expansion valve

Question 34

184.The effect of a voltage variation to 90 percent of normal voltage, for a compound wound DC motor, of the full load current is: a) Increase in the full load current approximately by 10% b) Zero c) A decrease in the full load current of approximately 10% d) A decrease in the full load current 20%

Answer 34

a) Increase in the full load current approximately by 10%

Question 35

185.The main advantage of operating a steam engine or steam turbine "condensing" is that it: a) Increases the mean effective pressure in the prime mover b) Decrease the condensate temperature c) Permits the use of exhaust steam to drive auxiliary equipment d) Eliminates the need for separating non- condensable from the steam

Answer 35

a) Increases the mean effective pressure in the prime mover

Question 36

186.The automatic shut off valves for a water gage installed on a high-pressure boiler must be: a) Horizontal swing-check valves b) Vertical swing-check valves c) Ball-check valves d) Spring-loaded check valves

Answer 36

c) Ball-check valves

Question 37

187.The efficiency of a riveted joint is defined as the ratio of the: a) Plate thickness to the rivet diameter b) Strength the riveted joint to the strength of a welded joint c) Strength of the riveted joint to the strength of the solid plate d) Number of rivets in the first row of the joint to the total number of rivets on one side of the joint

Answer 37

c) Strength of the riveted joint to the strength of the solid plate

Question 38

188.It corresponds to a heat absorption rate of 237.6 Btu/min (4.175 kW) with inlet an outlet pressures corresponding to saturation temperature of 23 oF (-5 oC) and 59 oF (15OC), respectively. How do you call this absorption rate? a) American Unit of refrigeration b) British Unit of refrigeration c) European Unit of refrigeration d) Standard Unit of refrigeration

Answer 38

b) British Unit of refrigeration

Question 39

189. What is the advantage of an internal water level control over an external one? a) The external control is in a 'dead' area b) It is less likely to scale up c) It will respond more quickly to changes in water level d) Daily testing of the level control chamber is not required

Answer 39

d) Daily testing of the level control chamber is not required

Question 40

190. What is the purpose of testing gauge glasses? a) To ensure the gauge cocks are operative b) To ensure there is sufficient water over the top fire tube c) To ensure the boiler water level is being properly sensed d) To check the boiler 1st and 2nd low water level alarms

Answer 40

a) To ensure the gauge cocks are operative

Question 41

191. What is the effect of an overloaded boiler? a) Water level rises and lock-out occurs b) Reduced steam production c) Water level drops and lock-out occurs d) Steam velocity reduces and separator efficiency drops

Answer 41

c) Water level drops and lock-out occurs

Question 42

192. Why is slow, controlled warm-up of a steam system essential? a) To make it easier to open the boiler main stop valve b) To minimize undue stresses and eliminate damage c) To permit separators to remove more water d) To prevent stress on the boiler

Answer 42

b) To minimize undue stresses and eliminate damage

Question 43

193. Which of the following is the main purpose of the steam distribution manifold? a) It replaces the need for a separator after the boiler b) to remove air from the steam system c) To provide an extra separating function d) It is a requirement of the pressure systems regulations

Answer 43

c) To provide an extra separating function

Question 44

194.Priming of a boiler is: a) Getting a boiler prepared for start-up b) A reduction in boiler pressure and carryover of water c) Occurrence of excessive TDS and carryover of water d) Balancing of boilers in a multi-boiler installation

Answer 44

c) Occurrence of excessive TDS and carryover of water

Question 45

195. What is the advantage of interruptible tariff? a) Quick and easy to change to heavy fuel oil when required b) Price of fuel c) Price of interruptible gas lower than fixed supply d) Convenience of supply

Answer 45

c) Price of interruptible gas lower than fixed supply

Question 46

196. At what pressure should a boiler safety valve be set? a) Maximum working pressure b) Normal working pressure c) Hydraulic test pressure d) Feed pump maximum pressure

Answer 46

a) Maximum working pressure

Question 47

197. What is the purpose of a bottom blowdown valve? a) To control water level b) To drain the boiler c) To maintain TDS d) To remove sludge

Answer 47

d) To remove sludge

Question 48

198.How often, as a minimum, should gauge glasses be tested? a) Once a shift b) Twice a day c) Once a day d) Once a week

Answer 48

c) Once a day

Question 49

199. Why are two-gauge glasses often fitted? a) One is a check against the other b) One is a reserve c) It is a legal requirement d) To increase periods between maintenance

Answer 49

c) It is a legal requirement

Question 50

200. Temporary hardness salts are reduced by: a) Raising the water temperature b) lowering the water temperature c) Raising the pH value d) letting the water settle

Answer 50

a) Raising the water temperature