What is hunting of a governor?

Hunting of governor

Hunting is a result of too sensitiveness of governor. It causes continuous fluctuation in engine speed, above and below the mean speed. This phenomenon is known as hunting. The high sensitiveness of governor results in substantial change in fuel supply for small change in engine speed.

What is sensitivity and hunting of governor?

A governor is said to be sensitive when it readily responds to a small change of speed. The movement of the sleeve for fractional change of speed is a measure of sensitivity. Sensitiveness = Hunting: If a governor is too sensitive i.e. for a small variation of speed causes a large change in the sleeve movement.

What is meant by stability of a governor?

Answer: Stability of governor : A governor is said to be stable when for every speed within the working range there is a definite configuration i.e. there is only one radius of rotation of the governor balls at which the governor is in equilibrium.

What is Isochronism of governor?

Explanation: Isochronous Governor: A governor is said to be isochronous when the equilibrium speed is constant (i.e. range of speed is zero) for all radii of rotation of the balls within the working range, neglecting friction. The isochronism is the stage of infinite sensitivity.

What is effort of a governor?

Explanation: The effort of a governor is the mean force exerted at the sleeve for a given percentage change of speed or lift of the sleeve.

What is Stability of Governor?|What is Governor Hunt?|Properties of Mechanical Governor?|Hunting?

What is governor effort with regard to governors?

Effort of Governor

When the governor speed changes the spindle moves up or down to new equilibrium position. There will be a force that prevents this movement of sleeve. The resistance is equal to Effort of governor. This resistance varies from maximum to minimum as the sleeve moves to the new equilibrium position.

What is the relation between power and effort of a governor?

Concept: Power of Governor: The power of a governor is the work done at the sleeve to change its equilibrium condition for a given percentage change of speed. It is the product of the mean value of the effort and the distance through which the sleeve moves.

What is governor droop?

Governor Droop means the governor response characteristic (speed versus output characteristic) defining the decrease in frequency needed to cause generator output to go from no load to full load.

What is coefficient of insensitiveness?

Explanation: Coefficient of insensitiveness is directly proportional to the friction at the sleeve and inversely proportional to the sum of masses of ball and the weight at sleeve, hence increase in friction results in increase in coefficient of insensitiveness.

What does the word isochronous mean?

A sequence of events is isochronous if the events occur regularly, or at equal time intervals.

Which governor is most sensitive?

Sensitiveness of a governor:

The Proell governor is the most sensitive governor among dead weight type governors. The sensitiveness of a governor is the ratio of the difference between the maximum and the minimum speeds i.e. range of speed to the mean equilibrium speed.

What is a stability?

Definition of stability

1 : the quality, state, or degree of being stable: such as. a : the strength to stand or endure : firmness. b : the property of a body that causes it when disturbed from a condition of equilibrium or steady motion to develop forces or moments that restore the original condition.

What are the types of governor?

Typically, there are two types of governors, i.e., centrifugal governor and inertia governor. A centrifugal governor is a type of governor with a feedback mechanism that regulates the flow of fuel or working fluid in an engine to keep it running at a near-constant speed.

Why do engines hunt?

Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburettor, adjustment of the governor, and/or changing the air filer may be required.

What is mean by stable and unstable governor?

For a stable governor, if the equilibrium speed increases, the radius of governor balls must also increase. A governor is said to be unstable if the radius of rotation decreases as the speed increases.

What is the difference between governor and flywheel?

Flywheel stores rotational energy when the mechanical energy supplied is more than that's required for operation, whereas a governor regulates the fuel supply according to the varying load conditions.

What is a Hartnell governor?

Hartnell governor is a spring controlled centrifugal governor, in which a spring controls the movement of the ball and hence the sleeve. Above fig shows a Hartnell governor. It consists of a frame /casing, in which a precompressed helical spring is housed.

What is the height of Watt governor?

The height of the Watt governor is inversely proportional to the square of the speed of the governor.

What is the effect of friction on the governor?

1 Answer. The effect of friction on the governor is to increase the range of speed, governor effort, and power of the governor.

What is governor sensitivity?

Sensitiveness of Governors

Sensitiveness is defined as the ratio of difference between maximum and minimum equilibrium speeds to the mean equilibrium speed.

What is speed governor Dead band?

Thus the governor dead-band is defined as the total magnitude of sustained speed change within which there is no change in valve position. The limiting value of dead-band is specified as 0.06%.

Why is droop necessary?

NOW THE QUESTION IS WHY DROOP IS NECESSARY? IF AN ENGINE IS RUNNING WITHOUT DROOP, A LOAD INCREASE WILL CAUSE THE ENGINE TO SLOW DOWN. THEN GOVERNOR WILL RESPOND BY INCREASING THE FUEL UNTIL THE ENGINE SPEED HAS RETURNED TO ORIGINAL SPEED.

What is the minimum age of governor?

A person to be eligible for appointment as Governor should be citizen of India and has completed age of 35 years (Article 157). The Governor shall not be a member of the Legislature or Parliament; shall not hold any office of profit, shall be entitled to emoluments and allowances. (Article 158).

What is the difference between Watt governor and Porter governor?

Watt governor is pendulum-type while the proell governor is dead-weight loaded type governor. The arm of watt governor may be connected to the spindle by two way, the pivot may be on the spindle axis, and pivot may be offset from the spindle axis but arms intersect while in proell governor the balls are fixed.