Task: PUMP 6014_Pumps, Seals and bearings

Score: 70.00 %

Passed: Yes

Time Limit: None

Time Spent: 00:00:00

Total Questions: 10

Correct: 7

Incorrect: 3
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Question 1:

The sealing ring of a stationary mechanical seal:

A - Is held stationary
B - Serves to distribute sealing liquid
C - Does not require an O-ring
D - Rotates with the shaft

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): A
Marked as: Incorrect

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Question 2:

Packing in the stuffing box of a pump:

A - Should stop leakage entirely
B - Requires no lubrication
C - Should not stop leakage entirely
D - Will not wear the pump shaft

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

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Question 3:

In a rotating mechanical seal:

A - A shell secured to the shaft by setscrews holds the sealing ring so that it turns with the shaft
B - A shell secured to the shaft by setscrews holds the mating ring so that it turns with the shaft
C - There is no need for O-rings because the mating surfaces provide the seal
D - A raised shoulder on the shaft accommodates the mating ring

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

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Question 4:

The type of bearing used in pumps in the illustration is called a:

A - Cylinder roller bearing
B - Needle roller bearing
C - Spherical roller bearing
D - Deep groove ball bearing

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

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Question 5:

The mechanical seal configuration where the sliding faces of two spring backed seals run against a common stationary seat is called:

A - Face to face
B - Tandem
C - Concentric
D - Back to back

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

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Question 6:

The component of a rotating mechanical seal that is held stationary in a recessed part of the pump housing, or the seal housing cover, is referred to as:

A - The mating ring
B - The O-ring
C - The sealing ring
D - The shell

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): A
Marked as: Incorrect

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Question 7:

The mating ring of a mechanical seal:

A - Holds the stuffing box packing in place
B - Is held in position by a spring
C - Is positioned so that it has no contact with the sealing ring
D - Is positioned with its face in contact with that of the sealing ring

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

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Question 8:

A mechanical seal, known as a "pusher" type:

A - Uses a bellows to provide the necessary spring loading for seal face contact
B - Does not use a dynamic secondary seal or o-ring
C - Has a single spring coil fits over the shaft and bellows
D - Uses a dynamic secondary seal or o-ring that seals the fluid path

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

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Question 9:

What should a pump that operates with negative suction pressure be equipped with to prevent air being drawn into the casing?

A - stuffing boxes and auto-lubricators
B - packing rings and a pump shaft
C - lantern rings and sealing water connections
D - shaft sleeves and sleeve adjustment nuts

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

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Question 10:

The gland that holds the packing inside the stuffing box must not be tightened too much, because:

A - The shaft must be allowed to create friction against the packing for pressure
B - A negative suction pressure is needed along the shaft to lubricate and cool the packing
C - A small amount of leakage is needed along the shaft to lubricate and cool the packing
D - The shaft sleeve will not be able to rotate, causing excess friction

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): C
Marked as: Incorrect

Дата добавления: 2015-10-30