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SJFD STUDY CARDS > GOVERNORS > Flashcards

GOVERNORS Flashcards

1
Q

WHAT IS A GOVERNOR?

A

AN AUTOMATIC ATTACHMENT FOR CONTROLLING SPEED OF A TURBINE, ENGINE, OR SIMILAR MACHINERY

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2
Q

IF A GOVERNOR IS REGULATING A SINGLE TURBINE UNIT WITH ITS OWN ISOLATED LOAD IT IS NORMALLY SET WITH SOME SPEED DROOP?

A

FALSE

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3
Q

NAME 4 PRINCIPLE PARTS OF A GOVERNOR

A

GOVERNOR BALL HEAD
PILOT AND RELAY VLV
SERVOMOTOR
RESTORING MECHANISM

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4
Q

WHAT IS THE FUNCTION OF THE PILOT VLV?

A

PROVIDES HYDRAULIC FORCE TO OPERATE THE RELAY VLV

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5
Q

FROM WHICH OF THE FOLLOWING DOES A GOVERNOR GET ITS SENSITIVITY?

A

THROUGH THE FLYBALLS

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6
Q

THE COMPENSATING DASHPOT IS A DEVICE

A

USED TO ACHIEVE STABILITY OF THE GOVERNOR UNIT

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7
Q

A GOVERNOR WITH 5% SPEED DROOP SENSES A CHANGE OF LOAD?

A

TRUE

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8
Q

A DASHPOT CONSISTS OF ______ PISTONS IN A OIL FILLED CHAMBER AND AN ADJUSTABLE _______ VLV

A

2
NEEDLE

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9
Q

THE PURPOSE OF VIBRATING DISCS OF A HYDRAULIC GOVERNOR IS TO?

A

IMPROVE SENSITIVITY

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10
Q

LIST 4 SAFETY DEVICES INCORPORATED IN A HYDRAULIC TURBINE GOVERNOR SYSTEM

A

BROKEN BELT DEVICE
OVERSPEED DEVICE
LOW OIL PRESSURE SWITCH
NOZZLE DEFLECTOR

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11
Q

THE AUX VLV IS USED IN A HYDRAULIC TURBINE GOVERNOR SYSTEM TO?

A

MANUALLY OPERATE THE GATE SERVOMOTOR

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12
Q

WHAT IS THE FUNCTION OF THE RESTORING MECHANISM ON A HYDRAULIC GOVERNOR SYSTEM?

A

RE-CENTERS THE PILOT AND RELAY VLV

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13
Q

WHAT IS THE MAIN FUNCTION OF THE PERMANENT MAGNETIC GENERATOR

A

SUPPLY ELECTRIC SIGNAL TO OPERATE BALL HEAD MOTOR

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14
Q

WHERE IS THE SPEEDER SPRING LOCATED?

A

NEXT TO THE FLYBALLS

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15
Q

WHAT 3 THINGS DOES A GATE LIMIT DEVICE DO?

A

CONTROL UNIT DURING START UP
PREVENTS GATE FROM OPENING PAST A PRE-DETERMINED POSITION
CONTROL GATE LIMITS FROM A REMOTE LOCATION

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16
Q

THE GOVERNOR AND THE BALL HEAD TURNS AT THE SAME RPM AS THE PMG

A

FALSE

17
Q

IF THE NEEDLE VLV IN THE DASHPOT HAS BEEN ADJUSTED CORRECTLY THEY WILL ALLOW THE SMALL PLUNGER TO RECENTER DURING THE SAME INTERVAL THAT THE SPEED DRIFTS BACK TO NORMAL?

A

TRUE

18
Q

THE RELAY VLV IS POSITIONED BY?

A

THE PILOT VLV

19
Q

WHAT ARE THE PRINCIPLE PARTS OF THE GOVERNOR OIL PRESSURE SYSTEM?

A

PUMP
SUMP
PIPING
ACCUMULATOR

20
Q

THE AUX VLV PROVIDES MANUAL CONTROL OF THE GOVERNOR PRIMARILY DURING?

A

MAINTENANCE OPERATIONS

21
Q

IF THE LOAD OF THE TURBINE IS SUDDENLY DROPPED THE SPEED OF THE GOVERNOR BALL HEAD?

A

INCREASES

22
Q

A SUDDEN LOAD INCREASE ON A HYDRAULIC GOVERNOR WILL CAUSE FLYBALLS TO CHANGE THIR ROTATIONAL PATH CAUSING THE FLYBALL ROD TO MOVE THE?

A

UPPER FLOATING LEVER UP

23
Q

AS A HYDRAULIC GOVERNOR SYSTEM FUNCTIONS THE RELAY VLV PLUNGER MOVES DOWNWARD AND THE PILOT VLV RESTORING LINKAGE MOVES THE PILOT VLV BUSING DOWNWARD UNTIL THE?

A

PORTS IN THE BUSHINGS ARE CLOSED

24
Q

WHAT TRANSMITS MOVEMENT OF FLYBALL ASSEMBLY TO PILOT VLV?

A

SPEEDER ROD

25
Q

NAME 4 VISUAL INDICATIONS OF POSSIBLE GOVERNOR OIL DETERIORATION?

A

SLUDGE
VARNISH
DARK OR CLOUDY COLOR
DIRTY FILTER

26
Q

NAME 4 DESIRABLE QUALITIES THAT GOOD GOVERNOR OIL SHOULD HAVE?

A

-GOOD LUBRICATING QUALITY
-DISSIPATES AIR
-DOES NOT BREAK DOWN
-DOES NOT PRECIPITATE SOLIDS

27
Q

A GOVERNOR SYSTEM CONSISTS OF A BALL HEAD HYDRAULIC ENERGY SUPPLY PIPING RESTORING MECHANISM AND OTHER COMPONENTS?

A

TRUE

28
Q

THE BALL HEAD IS A SPEED SENSING DEVICE THAT MECHANICALLY CONNECTED TO THE RELAY VLV IN SUCH A MATTER THAT IT CHANGES THE TURBINE SPEED?

A

FALSE

29
Q

THE DASHPOT NEEDLE DEVICE PROVIDES A MEANS OF ADJUSTMENTS TO REGULATE SPEED OF MOVEMENT OF WICKET GATES OR NEEDLE VLV?

A

FALSE

30
Q

THE OVERSPEED DEVICE OPERATES THE SHUT DOWN SOLENOID?

A

TRUE

31
Q

THE SERVOMOTOR IS A SINGLE ACTING CYLINDER THAT SUPPLIES THE FORCE THAT OPERATES THE WICKET GATES OR NEEDLE VLV?

A

FALSE

32
Q

A FLOATING LEVER IS A LEVER WITH SEVERAL INDEPENDENT FULCRUMS NONE OF WHICH ARE FIXED?

A

TRUE

33
Q

WITH TOO MUCH COMPENSATION THE GOVERNOR WILL BE SLUGGISH IN RESPONSE TO SPEED CHANGE?

A

TRUE

SJFD STUDY CARDS (13 decks)

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