Power Engineering Class 4 Part B
Exam Having All Correct Solutions
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
d. Floc point
e. Consistency
d - Ans--Which of the following has the greatest effect on the viscosity of
lubrication oil?
Choose one answer.
a. Pressure
b. Load
c. Flow
d. Temperature
e. Speed
b - Ans--Sodium (Soda) Base Greases are suitable for temperatures as high
as ___°C
a. 150
b. 120
c. 180
d. 100
e. 160
a - Ans--Which liquid lubricant is the most commonly used class?
a. Mineral oils
b. Fixed oils
c. Synthetic oils
d. High viscosity oil
e. Low viscosity oil
b - Ans--A thrust bearing which does not utilize the oil wedge principle of
lubrication is the:
Choose one answer.
a. Michell type
b. Collar type
c. Flotation type
d. Kingsbury type
e. Vertical type
Exam Having All Correct Solutions
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
d. Floc point
e. Consistency
d - Ans--Which of the following has the greatest effect on the viscosity of
lubrication oil?
Choose one answer.
a. Pressure
b. Load
c. Flow
d. Temperature
e. Speed
b - Ans--Sodium (Soda) Base Greases are suitable for temperatures as high
as ___°C
a. 150
b. 120
c. 180
d. 100
e. 160
a - Ans--Which liquid lubricant is the most commonly used class?
a. Mineral oils
b. Fixed oils
c. Synthetic oils
d. High viscosity oil
e. Low viscosity oil
b - Ans--A thrust bearing which does not utilize the oil wedge principle of
lubrication is the:
Choose one answer.
a. Michell type
b. Collar type
c. Flotation type
d. Kingsbury type
e. Vertical type
