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