Machine Dynamics

Hartung Governor

Question 1
Marks : +2 | -2
Pass Ratio : 100%
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
stable
unstable
isochronous
none of the mentioned
Explanation:
A governor is said to be unstable and the relation between the controlling force and the radius of
Question 2
Marks : +2 | -2
Pass Ratio : 100%
A governor is said to be isochronous when the equilibrium speed is
variable for different radii of rotation of governor balls
constant for all radii of rotation of the balls within the working range
constant for particular radii of rotation of governor balls
constant for only one radius of rotation of governor balls
Explanation:
Isochronism in governor means constant equilibrium speed for all the radii of rotation.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
stable
unstable
isochronous
none of the mentioned
Explanation:
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be isochronous.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Calculate the vertical height of a Watt governor when it rotates at 60 r.p.m.
0.248 m
0.248 m
0.448 m
0.548 m
Explanation:
Given : N1 = 60 r.p.m. ; N2 = 61 r.p.m.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation(r) is Fc = ar
True
False
Explanation:
A governor is said to be unstable and the relation between the controlling force and the radius of
Question 6
Marks : +2 | -2
Pass Ratio : 100%
In a governor, if the equilibrium speed is constant for all radii of rotation of balls, the governor is said to be
Stable
unstable
inertial
isochronous
Explanation:
The governor is said to be Isochronous if the equilibrium speed is constant for all radii of rotation of balls.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be unstable.
True
False
Explanation:
A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis below the origin.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
a is + ve and b = 0
a = 0 and b is +ve
a is +ve and b is -ve
a is +ve and b is also +ve
Explanation:
None
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is
Fc = ar + b
Fc = ar – b
Fc = ar
Fc = a/r + b
Explanation:
The relation between the controlling force (FC) and the radius of rotation (r) for the stability of spring controlled governors is given by the following equation
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The power of a governor is the work done at
the governor balls for change of speed
the sleeve for zero change of speed
the sleeve for a given rate of change of change
each governor ball for given percentage change of speed
Explanation:
Power of Governor: The work done by the governor on the sleeve to its equilibrium position for the fractional change in speed of governor is known as power of governor.