GOVERNORS Flashcards
WHAT IS A GOVERNOR?
AN AUTOMATIC ATTACHMENT FOR CONTROLLING SPEED OF A TURBINE, ENGINE, OR SIMILAR MACHINERY
IF A GOVERNOR IS REGULATING A SINGLE TURBINE UNIT WITH ITS OWN ISOLATED LOAD IT IS NORMALLY SET WITH SOME SPEED DROOP?
FALSE
NAME 4 PRINCIPLE PARTS OF A GOVERNOR
GOVERNOR BALL HEAD
PILOT AND RELAY VLV
SERVOMOTOR
RESTORING MECHANISM
WHAT IS THE FUNCTION OF THE PILOT VLV?
PROVIDES HYDRAULIC FORCE TO OPERATE THE RELAY VLV
FROM WHICH OF THE FOLLOWING DOES A GOVERNOR GET ITS SENSITIVITY?
THROUGH THE FLYBALLS
THE COMPENSATING DASHPOT IS A DEVICE
USED TO ACHIEVE STABILITY OF THE GOVERNOR UNIT
A GOVERNOR WITH 5% SPEED DROOP SENSES A CHANGE OF LOAD?
TRUE
A DASHPOT CONSISTS OF ______ PISTONS IN A OIL FILLED CHAMBER AND AN ADJUSTABLE _______ VLV
2
NEEDLE
THE PURPOSE OF VIBRATING DISCS OF A HYDRAULIC GOVERNOR IS TO?
IMPROVE SENSITIVITY
LIST 4 SAFETY DEVICES INCORPORATED IN A HYDRAULIC TURBINE GOVERNOR SYSTEM
BROKEN BELT DEVICE
OVERSPEED DEVICE
LOW OIL PRESSURE SWITCH
NOZZLE DEFLECTOR
THE AUX VLV IS USED IN A HYDRAULIC TURBINE GOVERNOR SYSTEM TO?
MANUALLY OPERATE THE GATE SERVOMOTOR
WHAT IS THE FUNCTION OF THE RESTORING MECHANISM ON A HYDRAULIC GOVERNOR SYSTEM?
RE-CENTERS THE PILOT AND RELAY VLV
WHAT IS THE MAIN FUNCTION OF THE PERMANENT MAGNETIC GENERATOR
SUPPLY ELECTRIC SIGNAL TO OPERATE BALL HEAD MOTOR
WHERE IS THE SPEEDER SPRING LOCATED?
NEXT TO THE FLYBALLS
WHAT 3 THINGS DOES A GATE LIMIT DEVICE DO?
CONTROL UNIT DURING START UP
PREVENTS GATE FROM OPENING PAST A PRE-DETERMINED POSITION
CONTROL GATE LIMITS FROM A REMOTE LOCATION
THE GOVERNOR AND THE BALL HEAD TURNS AT THE SAME RPM AS THE PMG
FALSE
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?
TRUE
THE RELAY VLV IS POSITIONED BY?
THE PILOT VLV
WHAT ARE THE PRINCIPLE PARTS OF THE GOVERNOR OIL PRESSURE SYSTEM?
PUMP
SUMP
PIPING
ACCUMULATOR
THE AUX VLV PROVIDES MANUAL CONTROL OF THE GOVERNOR PRIMARILY DURING?
MAINTENANCE OPERATIONS
IF THE LOAD OF THE TURBINE IS SUDDENLY DROPPED THE SPEED OF THE GOVERNOR BALL HEAD?
INCREASES
A SUDDEN LOAD INCREASE ON A HYDRAULIC GOVERNOR WILL CAUSE FLYBALLS TO CHANGE THIR ROTATIONAL PATH CAUSING THE FLYBALL ROD TO MOVE THE?
UPPER FLOATING LEVER UP
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?
PORTS IN THE BUSHINGS ARE CLOSED
WHAT TRANSMITS MOVEMENT OF FLYBALL ASSEMBLY TO PILOT VLV?
SPEEDER ROD
NAME 4 VISUAL INDICATIONS OF POSSIBLE GOVERNOR OIL DETERIORATION?
SLUDGE
VARNISH
DARK OR CLOUDY COLOR
DIRTY FILTER
NAME 4 DESIRABLE QUALITIES THAT GOOD GOVERNOR OIL SHOULD HAVE?
-GOOD LUBRICATING QUALITY
-DISSIPATES AIR
-DOES NOT BREAK DOWN
-DOES NOT PRECIPITATE SOLIDS
A GOVERNOR SYSTEM CONSISTS OF A BALL HEAD HYDRAULIC ENERGY SUPPLY PIPING RESTORING MECHANISM AND OTHER COMPONENTS?
TRUE
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?
FALSE
THE DASHPOT NEEDLE DEVICE PROVIDES A MEANS OF ADJUSTMENTS TO REGULATE SPEED OF MOVEMENT OF WICKET GATES OR NEEDLE VLV?
FALSE
THE OVERSPEED DEVICE OPERATES THE SHUT DOWN SOLENOID?
TRUE
THE SERVOMOTOR IS A SINGLE ACTING CYLINDER THAT SUPPLIES THE FORCE THAT OPERATES THE WICKET GATES OR NEEDLE VLV?
FALSE
A FLOATING LEVER IS A LEVER WITH SEVERAL INDEPENDENT FULCRUMS NONE OF WHICH ARE FIXED?
TRUE
WITH TOO MUCH COMPENSATION THE GOVERNOR WILL BE SLUGGISH IN RESPONSE TO SPEED CHANGE?
TRUE
