FEA FINAL THEORY EXAM QUESTIONS AND ANSWERS
Frequencies of the first six modes found in Frequency study are: f1 = 6 Hz, f2 = 12 Hz, f3 = 50 Hz, f4 = 120
Hz, f5 = 160 Hz, f6 = 250 Hz. How many RBMs does this model have?
Two
Three
Zero
Six - CORRECT ANSWER✅✅Zero
The period of a harmonic vibration is 1s. What is the frequency?
6.28 rad/s
1s
0.1 Hz
1 rad/s - CORRECT ANSWER✅✅6.28 rad/s = 1 Hz
ω = 2π/T
Restraints are applied in the local cylindrical coordinate system associated with the hole. Restraints are
applied in the radial direction only. How many RBM does this model have? - CORRECT ANSWER✅✅2,
one rotational and one transational
A shell element is in pure tension. P1 stress on the top of shell element is 150 MPa. What is the bending
stress in the same location?
150 MPa
0 MPa
-150 MPa
75 MPa - CORRECT ANSWER✅✅0 MPa, loaded in pure tension
The model is meshed with solid elements. It has Fixed restraint applied to one corner as shown. There
are no other restraints. How many RBM are present?
None of these
3
, 5
1
6 - CORRECT ANSWER✅✅3, all three rotational RBM
Heat is generated in the volume of a graphite ball. The ball radiates heat out to the vacuum. What
mechanisms of heat transfer are present in this problem?
Conduction, convection, and radiation
Radiation only
None of these
Conduction and radiation - CORRECT ANSWER✅✅Conduction and Radiation
Which mechanism of heat transfer requires fluid?
Convection
Conduction
Radiation
Thermal stress
Thermal strain - CORRECT ANSWER✅✅Convection
Transient thermal analysis is completed:
In time steps
In stiffness increments
After temperature convergence has been completed
Always after the prerequisite steady-state thermal analysis - CORRECT ANSWER✅✅In time steps
The cage is meshed with truss elements. All legs have Fixed supports. Select the correct statement:
Cage stiffness is higher in direction of the red load than in the direction of the green load
Cage has RBMs
Cage stiffness is higher in direction of the green load than in the direction of the red load - CORRECT
ANSWER✅✅Cage has RBMs
Frequencies of the first six modes found in Frequency study are: f1 = 6 Hz, f2 = 12 Hz, f3 = 50 Hz, f4 = 120
Hz, f5 = 160 Hz, f6 = 250 Hz. How many RBMs does this model have?
Two
Three
Zero
Six - CORRECT ANSWER✅✅Zero
The period of a harmonic vibration is 1s. What is the frequency?
6.28 rad/s
1s
0.1 Hz
1 rad/s - CORRECT ANSWER✅✅6.28 rad/s = 1 Hz
ω = 2π/T
Restraints are applied in the local cylindrical coordinate system associated with the hole. Restraints are
applied in the radial direction only. How many RBM does this model have? - CORRECT ANSWER✅✅2,
one rotational and one transational
A shell element is in pure tension. P1 stress on the top of shell element is 150 MPa. What is the bending
stress in the same location?
150 MPa
0 MPa
-150 MPa
75 MPa - CORRECT ANSWER✅✅0 MPa, loaded in pure tension
The model is meshed with solid elements. It has Fixed restraint applied to one corner as shown. There
are no other restraints. How many RBM are present?
None of these
3
, 5
1
6 - CORRECT ANSWER✅✅3, all three rotational RBM
Heat is generated in the volume of a graphite ball. The ball radiates heat out to the vacuum. What
mechanisms of heat transfer are present in this problem?
Conduction, convection, and radiation
Radiation only
None of these
Conduction and radiation - CORRECT ANSWER✅✅Conduction and Radiation
Which mechanism of heat transfer requires fluid?
Convection
Conduction
Radiation
Thermal stress
Thermal strain - CORRECT ANSWER✅✅Convection
Transient thermal analysis is completed:
In time steps
In stiffness increments
After temperature convergence has been completed
Always after the prerequisite steady-state thermal analysis - CORRECT ANSWER✅✅In time steps
The cage is meshed with truss elements. All legs have Fixed supports. Select the correct statement:
Cage stiffness is higher in direction of the red load than in the direction of the green load
Cage has RBMs
Cage stiffness is higher in direction of the green load than in the direction of the red load - CORRECT
ANSWER✅✅Cage has RBMs
