Strain Energy - Mechanical Engineering (MCQ) questions and answers

1)   What is the proof resilience of a square bar of 2500 mm2  and 200 mm long, when a load of 150 kN is induced gradually?
(Take E = 150 x 103 Mpa)

a. 45 J
b. 8 J
c. 5.3 J
d. 6 J
Answer  Explanation 

ANSWER: 6 J

Explanation:
No explanation is available for this question!
2)   Stress on an object due to sudden load is _________ the stress induced when the load is applied gradually.

a. equal to
b. half
c. twice
d. thrice
Answer  Explanation 

ANSWER: twice

Explanation:
No explanation is available for this question!
3)   What is the strain energy caused due to self weight in a cylindrical bar?

a. (W2 L) / (6 AE)
b. (W L) / (8 AE)
c. (τ2/ 2G)V
d. (τ2/ G)V
Answer  Explanation 

ANSWER: (W2 L) / (6 AE)

Explanation:
No explanation is available for this question!
4)   What is the maximum stress induced in a bar 2500 mm2, when a load of 2000 kN is applied suddenly?

a. 400 N/mm2
b. 800 N/mm2
c. 1600 N/mm2
d. Insufficient data
Answer  Explanation 

ANSWER: 1600 N/mm2

Explanation:
No explanation is available for this question!
5)   Strain energy stored in a uniform bar is given as ______

a. (σ E/ 2A)
b. (σ L/ 2AE)
c. (σ2 AL/ 4E)
d. (σ2 AL/ 2E)
Answer  Explanation 

ANSWER: (σ2 AL/ 2E)

Explanation:
No explanation is available for this question!
6)   Load is gradually applied on a steel plate shown below, what is the modulus of resilience, if 130 N/mm2 is the maximum stress applied? (Assume E = 100 x 103 Mpa)

a. 0.845 N/mm2
b. 0.0845 N/mm2
c. 0.00845 N/mm2
d. Insufficient data
Answer  Explanation 

ANSWER: 0.0845 N/mm2

Explanation:
No explanation is available for this question!
7)   What is the strain energy stored in a simply supported beam due to bending moment?

a. ∫ (M2/EI)
b. ∫ (M2/2EI)
c. ∫ (M/2EI)
d. ∫ (2M/EI)
Answer  Explanation 

ANSWER: ∫ (M2/2EI)

Explanation:
No explanation is available for this question!
8)   Modulus of resilience is the ratio of ______

a. minimum strain energy and unit volume
b. maximum stress energy and unit volume
c. proof resilience and unit volume
d. resilience and unit area
Answer  Explanation 

ANSWER: proof resilience and unit volume

Explanation:
No explanation is available for this question!
9)   What is the strain energy stored in a cube of 50 mm, when it is subjected to shear stress of 200 Mpa. (G = 100 Gpa)   

a. 25 Nm
b. 75 Nm
c. 125 Nm
d. 150 Nm
Answer  Explanation 

ANSWER: 25 Nm

Explanation:
No explanation is available for this question!
10)   Energy stored in a body within an elastic limit is called as _____  

a. resilience
b. strain energy
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: both a. and b.

Explanation:
No explanation is available for this question!

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