101-150

Question 1

101. Name one characteristic feature of mechanical steam traps.

a) They pass condensate at steam temperature
b) They operate by sensing condensatet emperature
c) They can be fitted into any position
d) They are not affected by increasing back pressure

Answer 1

a) They pass condensate at steam temperature

Question 2

102. In a mechanical steam trap, why is a float trap better at venting air than an inverted bucket trap?

a) A float can quickly adjust to the presence of air
b) A float is fitted with an automatic air vent
c) A float trap does not vent air better than bucket trap
d) The air vent orifice is adjustable on a float trap

Answer 2

b) A float is fitted with an automatic air vent

Question 3

105. A heat exchanger is designed to operate without waterlogging of the steam space. What is the usual choice of trap for its drainage?

a) Thermostatic trap
b) Inverted bucket trap
c) Thermodynamic trap
d) Float trap with thermostatic air vent

Answer 3

d) Float trap with thermostatic air vent

Question 4

104. In a mechanical steam trap, what advantage does a bucket trap have over a float type?

a) It is able to withstand water hammer
b) It can be used on higher pressure
c) It can discharge air freely
d) It cannot lose its water seal

Answer 4

b) It can be used on higher pressure

Question 5

103. In a mechanical steam trap, what added benefit does the automatic air vent offer to a float trap?

a) It stops the trap from freezing in cold weather
b) The trap can be use on larger backpressures
c) It significantly increases the cold start-up capacity of the trap
d) The condensate orifice can be the same size for all pressure gauges

Answer 5

c) It significantly increases the cold start-up capacity of the trap

Question 6

106. Which is the best trap to use when steam locking can occur?

a) An inverted bucket trap with an internal check valve mechanism
b) A balanced pressure steam trap
c) A float trap with automatic air vent
d) A float trap with steam lock release mechanism

Answer 6

a) An inverted bucket trap with an internal check valve mechanism

Question 7

107. What is a common cause of water-hammer in drying coils?

a) Wet steam supplied to the coil
b) Too low a steam pressure onto the coil
c) Condensate has to lift after the steam trap
d) The coil falling in the direction of steam flow

Answer 7

c) Condensate has to lift after the steam trap

Question 8

108. Which of the following statements is true?

a) Bimetallic steam traps are an ideal choice for rotating cylinders
b) Rotating cylinders cannot suffer from steam locking
c) Strainers cannot be fitted to float traps which have a steam lock release
d) Air vents around the thermodynamic and inverted bucket traps can considerably improve start-up times

Answer 8

d) Air vents around the thermodynamic and inverted bucket traps can considerably improve start-up times

Question 9

109. Name the principal cause of water-hammer?

a) Water particles suspended in steam
b) Water allowed to build up in pipes
c) Water droplets carried along the insides of pipes
d) Wet steam passing through steam traps

Answer 9

b) Water allowed to build up in pipes

Question 10

111. What do you call a boiler of which both the location and ownership have been change after primary use?

a) Second hand boiler
b) Surplus boiler
c) Miniature boiler
d) Reinstalled boiler

Answer 10

a) Second hand boiler

Question 11

110. What effect does steam locking have on rotating machinery?

a) None at all
b) It reduces the drying rate of drying cylinders
c) It increases the drying rate of drying cylinders
d) It causes the steam trap to air bind

Answer 11

b) It reduces the drying rate of drying cylinders

Question 12

112. It is a boiler removed from its original setting and re-erected at the same location. or erected at a location without change of ownership. How do you call this boiler?

a) Second hand boiler
b) Surplus boiler
c) Miniature boiler
d) Reinstalled boiler

Answer 12

d) Reinstalled boiler

Question 13

113. Each miniature boiler shall be equipped with which of the following for the determination of water level?

a) Safety valve
b) Fusible plug
c) Water gage glass
d) Pressure gages

Answer 13

c) Water gage glass

Question 14

114. The maximum allowable working pressure of a non-code steel or wrought iron heating boiler of welded construction shall not exceed to which of the following pressures?

a) 1 atmosphere
b) 1 Bar
c) 100 kPa
d) 2 gage pressures

Answer 14

b) 1 Bar

Question 15

115. What do you call a refrigeration system in which the refrigerant gas evolved in the evaporator is taken up in an absorber and released in a generator upon the application of heat?

a) Absorption refrigeration system
b) Cascade refrigeration system
c) Flooded refrigeration system
d) Steam jet refrigeration system

Answer 15

a) Absorption refrigeration system

Question 16

116. What do you call a shut-off valve other than a valve for controlling the flow of refrigerant in a refrigeration system?

a) Fusible valve
b) Stop valve
c) Check valve
d) Relief valve

Answer 16

b) Stop valve

Question 17

117. What is a device, used in refrigeration system, having a predetermined temperature fusible member for the relief of pressures?

a) Fusible valve
b) Stop valve
c) Check valve
d) Relief valve

Answer 17

a) Fusible valve

Question 18

118. It is a measure of the lack of potential or quality of energy; and once that energy has been exchanged or converted, it cannot revert back to a higher level. What is this?

a) Specifc heat
b) Entropy
c) Internal energy
d) Molecular energy

Answer 18

b) Entropy

Question 19

119. What do you call the method used to evaluate all welds performed on pressure parts of boiler tube materials?

a) Radiographic test
b) Hydrostatic test
c) Vacuum test
d) Orsat analysis

Answer 19

a) Radiographic test

Question 20

124. What do you call a form of boiler fuel that is easy to burn, with very little excess air?

a) Coal
b) Oil
c) Gas
d) Bunker

Answer 20

c) Gas

Question 21

120. It is a boiler testing method that is used to verify the microstructure of the boiler tubes using optical microscopes. How do you call this method?

a) Tube sampling
b) Metallurgic replication
c) Radiographic testing
d) Optical testing

Answer 21

b) Metallurgic replication

Question 22

121. Which of the following is true regarding the relation of rk and re for spark-ignition engine, where rk = compression ratio while re = expansion ratio?

a) rk > re
b) rk < re
c) rk = re
d) re is not considered in the spark-ignition engine

Answer 22

c) rk = re

Question 23

122. It is the generic term given to a family of solid fuels with high carbon content. How do you call this?

a) Solid fuel
b) Coal
c) Anthracite
d) Bituminous

Answer 23

b) Coal

Question 24

123. It is a boiler fuel created from the residue produced from crude petroleum after it has been distilled to produce lighter oils like gasoline, paraffin, kerosene, diesel or gas oil. What is this fuel?

a) Oil
b) Kerosene
c) Coke
d) Peat

Answer 24

a) Oil

Question 25

125. The second law of thermodynamics says that whenever energy is exchanged or converted from one form to another, the potential for energy to do work will be a) Decreased b) Increased c) Zero d) Stagnant

Answer 25

a) Decreased

Question 26

126. What is true about steam as it condenses? a) It does so at constant entropy and temperature b) It does so at constant enthalpy and reducing temperature c) Both enthalpy and entropy reduce and temperature remains constant d) Both enthalpy and entropy increase

Answer 26

c) Both enthalpy and entropy reduce and temperature remains constant

Question 27

127. It is an increase in fluid pressure in a long pipe caused by a sudden velocity decrease, where the sudden decrease in velocity is caused by a valve closing. a) Aero dynamics b) Water hammer c) Terminal velocity d) Drag

Answer 27

b) Water hammer

Question 28

128.It is an upward force that is exerted on an object (like flat plate, airfoil, rotating cylinder, etc.) as the object passes through a fluid. What do you call this? a) Drag b) Lift c) Aero horsepower d) Terminal velocity

Answer 28

b) Lift

Question 29

129. What is a frictional force that acts parallel but opposite to the direction of motion of fluid? a) Drag b) lift c) Aero horsepower d) Terminal velocity

Answer 29

a) Drag

Question 30

130. It is a term used by automobile manufacturers to designate the power required to move a car horizontally at 50 mi/hr against the drag force. What is this? a) Mechanical horsepower b) Aero horsepower c) Fuel power d) Fluid power

Answer 30

b) Aero horsepower

Question 31

131.A manufacturer claims that it has a COP of 2.0 when cooling a food at 5 oC using ambient air at 30 oC as a heat sink. Is the claim of the manufacturer valid? a) Yes b) No c) Probably d) It needs experimental verification

Answer 31

a) Yes Note: Yes, because the claimed COP of the manufacturer is lower than the COP of Carnot Refrigeration

Question 32

132. What can you say about the velocity of fluid at the center of the pipe section? a) Maximum b) Minimum c) Average d) Zero

Answer 32

a) Maximum

Question 33

133. Continuity equation is applicable to which of the following? a) Viscous and unviscous fluids b) Compressibility fluids c) Conservation of mass d) Steady and unsteady flows

Answer 33

c) Conservation of mass

Question 34

134. Hygrometer is an instrument used to determine of which of the following? a) Specific gravity of fluids b) Specific gravity of gases c) Specific gravity of liquids d) Specific gravity of solids

Answer 34

a) Specific gravity of fluids

Question 35

135. At critical point of a pure substance, what is the value of latent heat? a) Maximum b) Minimum c) Zero d) Below zero

Answer 35

c) Zero note: Zero, at the critical point hg-hf=0

Question 36

136. Which of the following is a function of a steam nozzle? a) Converts kinetic energy into heat energy b) Changes internal energy into kinetic energy c) Converts potential energy into heat energy d) Changes enthalpic energy into kinetic energy

Answer 36

d) Changes enthalpic energy into kinetic energy

Question 37

137. Generally, steam turbines in power station operate at which of the following speeds? a) 3000 rpm b) 1000 rpm c) 4000 rpm d) 500 rpm

Answer 37

c) 4000 rpm

Question 38

138. Tidal power is the power generated from which of the following? a) Waves of the ocean b) Thermal energy of ocean water c) Raw sea water d) Rise and fall of tides

Answer 38

d) Rise and fall of tides

Question 39

139. Which of the following is an expression or equivalent of? horsepower per ton of refrigeration? a) COP/ 4.715 b) 4.715/COP c) COP x 4.715 d) 1/ (4.715 x COP)

Answer 39

b) 4.715/COP

Question 40

140.It is the ratio of the amount of heat taken up by a substance to the temperature at which the substance exists. How do you call this? a) Internal energy b) Flow energy c) Enthalpy d) Entropy

Answer 40

d) Entropy

Question 41

141. Which of the following is a type of water turbine where a jet of water is made to fall on the blades or buckets and due to the impulse of water the turbine starts moving? a) Reaction turbine b) Steam turbine c) Francis turbine d) Pelton wheel

Answer 41

d) Pelton wheel

Question 42

142. What do you call a fan in which the fluid is accelerated parallel to the fan axis? a) Axial centrifugal fan b) Mixed flow centrifugal fan c) Radial centrifugal fan d) Francis type fan

Answer 42

a) Axial centrifugal fan

Question 43

143. It represents the loss due to mechanical friction of the moving parts of the engine, and expressed as horsepower. How do you call this? a) Indicated Hp b) Brake Hp c) Combined Hp d) Friction Hp

Answer 43

d) Friction Hp

Question 44

144. How do you call a device or engine which continually and indefinitely discharged more energy than it receives? a) Carnot engine b) Generating machine c) Stirling engine d) Perpetual motion machine

Answer 44

d) Perpetual motion machine

Question 45

145. In plotting the bHp versus speed in a wide- open throttle test for a spark ignition engine, the bHp curve: a) is a Straight line. b) tends to concave downward c) has no characteristic shape d) tends to concave upward

Answer 45

b) tends to concave downward

Question 46

146. Upon entering the boiler room, you find the water out of the glass, the safety valve blowing off strong, and a fire under the boiler. Your first action would be to: a) Remove the fire with draft and damper open b) Cool the boiler down completely c) Prevent priming by not raising the safety valve or making change in operating of engines or boiler d) Cool the boiler down completely and prevent priming by not raising the safety valve

Answer 46

a) Remove the fire with draft and damper open

Question 47

147. The A.S.M.E. Boiler code for boiler shells requires a tensile strength of which of the following, in psi? a) 10000 to 20000 b) 25000 to 45000 c) 55000 to 63000 d) 70000 to 85000

Answer 47

c) 55000 to 63000

Question 48

148. The best time to blow a boiler down is: a) Once a day when the load is lightest b) Once a day under full load c) When the chemical concentration is greatest d) Once a shift

Answer 48

c) When the chemical concentration is greatest

Question 49

149.In performing a hydrostatic test on an existing power boiler, the required test pressure must be controlled so that it is not exceeded by more than: a) 2% b) 4% c) 6% d) 8%

Answer 49

a) 2%

Question 50

150.The first step to take in planning a preventive maintenance program is to: a) Replace all electric wiring b) Make an equipment inventory c) Replace all pump seals d) Repair all equipment which is not in operation

Answer 50

b) Make an equipment inventory