Power engineering Class 4 Part B Exam
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e - Impulse turbines:
ii ii ii ii ii
Choose one answer. ii ii
a. are only used with low pressure steam
ii ii ii ii ii ii ii ii
b. require large thrust bearings
ii ii ii ii ii
c. were invented by Parsons
ii ii ii ii ii
d. have large pressure drops across the huckets
ii ii ii ii ii ii ii ii
e. have blades with the same steam inlet and outlet angles
ii ii ii ii ii ii ii ii ii ii
d - The stationary passages of a reaction turbine are called the:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Shaft ii ii
b. Rotor ii ii
c. Shroud ring
ii ii ii
d. Fixed blades
ii ii ii
e. Diaphragms
ii
c - The great majority of steam turbine governing systems utilize the
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a) hydraulic system principle
ii ii ii
b) pneumatic system principle
ii ii ii
c) mechanical centrifugal principle
ii ii ii
d) lever principle
ii ii
e) bimetal expansion principle
ii ii ii
e - Biological fouling in recirculating cooling water towers is caused by algae, _____ and
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
bacteria growth.
ii ii
Choose one answer. ii ii
a. Flora ii ii
b. Fauna ii ii
c. Micro-organisms
ii ii
d. Biological
ii ii
e. Fungi ii
c - With all other factors being equal, a counter-flow cooling tower _____________ as a
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
cross-flow cooling tower.
ii ii ii
Choose one answer. ii ii
a. Is not as tall
ii ii ii ii ii
b. Has much less cooling capacity
ii ii ii ii ii ii
c. Requires less floor space
ii ii ii ii ii
d. Requires less fan power
ii ii ii ii ii
e. Has a lower pressure drop
ii ii ii ii ii
ii e - A simple gas turbine is one without reheaters or:
ii ii ii ii ii ii ii ii ii ii ii ii
,Choose one answer. ii ii
a. Starting motors
ii ii ii
b. Shafts ii ii
c. Compressors
ii ii
d. Combustors
ii ii
e. Regenerators
ii
a - Large internal combustion engines are cooled with:
ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Water jackets
ii ii ii
b. Evaporation
ii ii
c. Air cooling
ii ii ii
d. Condensers
ii ii
e. Refrigeration
ii
a - Using a compressed air starting motor is a popular method of starting:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. A large stationary diesel engine
ii ii ii ii ii ii
b. A small two-stroke engine
ii ii ii ii ii
c. A gasoline engine
ii ii ii ii
d. An aircraft engine
ii ii ii ii
e. A propane engine
ii ii ii
b - When a reciprocating pump delivers fluid every second stroke of its piston, it is called a
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
___________ pump:
ii ii
Choose one answer. ii ii
a. Positive displacement
ii ii ii
b. Single acting
ii ii ii
c. Two-stage
ii ii
d. Double acting
ii ii ii
e. Duplex ii
ii c - Rotary pumps:
ii ii ii ii ii
1. are high pressure pumps
ii ii ii ii
2. must be primed
ii ii ii
3. use mechanical seals
ii ii ii
4. are positive displacement pumps
ii ii ii ii
a) 1, 2 ii ii
b) 2, 3 ii ii
c) 1, 4 ii ii
d) 1, 3, 4 ii ii ii
e) 1, 2, 3, 4
ii ii ii ii
ii a - Intercoolers:
ii ii ii ii
, Choose one answer. ii ii
a. Must have a drain
ii ii ii ii ii
b. Are more efficient when cooled with air than with water
ii ii ii ii ii ii ii ii ii ii ii
c. Are used on double acting single stage compressors
ii ii ii ii ii ii ii ii ii
d. Help increase the volume of the air
ii ii ii ii ii ii ii ii
e. Should use an antifreeze solution
ii ii ii ii ii
e - Grease:
ii ii ii ii ii
Choose one answer. ii ii
a. Is a semi-liquid
ii ii ii ii
b. Is an excellent high-speed, low load lubricant
ii ii ii ii ii ii ii ii
c. Attracts dirt and water to bearings, leading to premature failure
ii ii ii ii ii ii ii ii ii ii ii
d. Is likely to drip or splash from bearings and therefore is rarely used in the textile and food
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
industries
ii ii
e. Can be used under conditions where oil may leak away and leave the bearing dry
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a - The property of oil that indicates its ability to support a load is:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Viscosity
ii ii
b. Viscosity index
ii ii ii
c. Pour point
ii ii ii
d. Floc point
ii ii ii
e. Consistency
ii
d - Which of the following has the greatest effect on the viscosity of lubrication oil?
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Pressure
ii ii
b. Load
ii ii
c. Flow
ii ii
d. Temperature
ii ii
e. Speed
ii
b - Sodium (Soda) Base Greases are suitable for temperatures as high as ___°C
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a. 150ii
b. 120ii
c. 180
ii
d. 100ii
e. 160ii
a - Which liquid lubricant is the most commonly used class?
ii ii ii ii ii ii ii ii ii ii ii ii ii
a. Mineral oils
ii ii
b. Fixed oils
ii ii
c. Synthetic oils
ii ii
d. High viscosity oil
ii ii ii ii
e. Low viscosity oil
ii ii ii
Newest 2024/25 RATED A+
e - Impulse turbines:
ii ii ii ii ii
Choose one answer. ii ii
a. are only used with low pressure steam
ii ii ii ii ii ii ii ii
b. require large thrust bearings
ii ii ii ii ii
c. were invented by Parsons
ii ii ii ii ii
d. have large pressure drops across the huckets
ii ii ii ii ii ii ii ii
e. have blades with the same steam inlet and outlet angles
ii ii ii ii ii ii ii ii ii ii
d - The stationary passages of a reaction turbine are called the:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Shaft ii ii
b. Rotor ii ii
c. Shroud ring
ii ii ii
d. Fixed blades
ii ii ii
e. Diaphragms
ii
c - The great majority of steam turbine governing systems utilize the
ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a) hydraulic system principle
ii ii ii
b) pneumatic system principle
ii ii ii
c) mechanical centrifugal principle
ii ii ii
d) lever principle
ii ii
e) bimetal expansion principle
ii ii ii
e - Biological fouling in recirculating cooling water towers is caused by algae, _____ and
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
bacteria growth.
ii ii
Choose one answer. ii ii
a. Flora ii ii
b. Fauna ii ii
c. Micro-organisms
ii ii
d. Biological
ii ii
e. Fungi ii
c - With all other factors being equal, a counter-flow cooling tower _____________ as a
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
cross-flow cooling tower.
ii ii ii
Choose one answer. ii ii
a. Is not as tall
ii ii ii ii ii
b. Has much less cooling capacity
ii ii ii ii ii ii
c. Requires less floor space
ii ii ii ii ii
d. Requires less fan power
ii ii ii ii ii
e. Has a lower pressure drop
ii ii ii ii ii
ii e - A simple gas turbine is one without reheaters or:
ii ii ii ii ii ii ii ii ii ii ii ii
,Choose one answer. ii ii
a. Starting motors
ii ii ii
b. Shafts ii ii
c. Compressors
ii ii
d. Combustors
ii ii
e. Regenerators
ii
a - Large internal combustion engines are cooled with:
ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Water jackets
ii ii ii
b. Evaporation
ii ii
c. Air cooling
ii ii ii
d. Condensers
ii ii
e. Refrigeration
ii
a - Using a compressed air starting motor is a popular method of starting:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. A large stationary diesel engine
ii ii ii ii ii ii
b. A small two-stroke engine
ii ii ii ii ii
c. A gasoline engine
ii ii ii ii
d. An aircraft engine
ii ii ii ii
e. A propane engine
ii ii ii
b - When a reciprocating pump delivers fluid every second stroke of its piston, it is called a
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
___________ pump:
ii ii
Choose one answer. ii ii
a. Positive displacement
ii ii ii
b. Single acting
ii ii ii
c. Two-stage
ii ii
d. Double acting
ii ii ii
e. Duplex ii
ii c - Rotary pumps:
ii ii ii ii ii
1. are high pressure pumps
ii ii ii ii
2. must be primed
ii ii ii
3. use mechanical seals
ii ii ii
4. are positive displacement pumps
ii ii ii ii
a) 1, 2 ii ii
b) 2, 3 ii ii
c) 1, 4 ii ii
d) 1, 3, 4 ii ii ii
e) 1, 2, 3, 4
ii ii ii ii
ii a - Intercoolers:
ii ii ii ii
, Choose one answer. ii ii
a. Must have a drain
ii ii ii ii ii
b. Are more efficient when cooled with air than with water
ii ii ii ii ii ii ii ii ii ii ii
c. Are used on double acting single stage compressors
ii ii ii ii ii ii ii ii ii
d. Help increase the volume of the air
ii ii ii ii ii ii ii ii
e. Should use an antifreeze solution
ii ii ii ii ii
e - Grease:
ii ii ii ii ii
Choose one answer. ii ii
a. Is a semi-liquid
ii ii ii ii
b. Is an excellent high-speed, low load lubricant
ii ii ii ii ii ii ii ii
c. Attracts dirt and water to bearings, leading to premature failure
ii ii ii ii ii ii ii ii ii ii ii
d. Is likely to drip or splash from bearings and therefore is rarely used in the textile and food
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
industries
ii ii
e. Can be used under conditions where oil may leak away and leave the bearing dry
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a - The property of oil that indicates its ability to support a load is:
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Viscosity
ii ii
b. Viscosity index
ii ii ii
c. Pour point
ii ii ii
d. Floc point
ii ii ii
e. Consistency
ii
d - Which of the following has the greatest effect on the viscosity of lubrication oil?
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
Choose one answer. ii ii
a. Pressure
ii ii
b. Load
ii ii
c. Flow
ii ii
d. Temperature
ii ii
e. Speed
ii
b - Sodium (Soda) Base Greases are suitable for temperatures as high as ___°C
ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii
a. 150ii
b. 120ii
c. 180
ii
d. 100ii
e. 160ii
a - Which liquid lubricant is the most commonly used class?
ii ii ii ii ii ii ii ii ii ii ii ii ii
a. Mineral oils
ii ii
b. Fixed oils
ii ii
c. Synthetic oils
ii ii
d. High viscosity oil
ii ii ii ii
e. Low viscosity oil
ii ii ii
