Static and Dynamic Force Analysis - Mechanical Engineering (MCQ) questions and answers

1)   Calculate the thrust in connecting rod, if piston effort is 200 kN and crank makes an angle of 45o from TDC. Assume obliquity ratio = 3.5

a. 900.80 kN
b. 204.20 kN
c. 195.87 kN
d. 970.02 kN
Answer  Explanation 

ANSWER: 204.20 kN

Explanation:
No explanation is available for this question!
2)   In the bifilar suspension system shown below if x = y, periodic oscillation tp is given as

a. (2πk / x2) √(l / g)
b. (2πk / xy) √(l / g)
c. (2πk) √(l / gxy)
d. (2πk / x) √(l / g)
Answer  Explanation 

ANSWER: (2πk / x) √(l / g)

Explanation:
No explanation is available for this question!
3)   The difference between which two factors denotes the correction couple?

a. Difference between force required to accelerate non dynamically equivalent system and dynamically equivalent system
b. Difference between torque required to accelerate non dynamically equivalent system and dynamically equivalent system
c. Difference between torque required to decelerate dynamically equivalent system and non dynamically equivalent system
d. none of the above
Answer  Explanation 

ANSWER: Difference between torque required to accelerate non dynamically equivalent system and dynamically equivalent system

Explanation:
No explanation is available for this question!
4)   Which of the following statements is/are true?

1. Static force analysis does not consider inertia forces along with static forces
2. The SI unit of mass moment of inertia is kg/m2
3. Mass moment of inertia of a thin disc about its diameter is given by (mr2) / 2

a. Only 1
b. Only 2
c. Only 3
d. All the above statements are true
Answer  Explanation 

ANSWER: Only 1

Explanation:
No explanation is available for this question!
5)   According to D' Alembert's principle, the body is in equilibrium position if

a. inertia force is applied in the direction opposite to the resultant force
b. inertia force is applied in the same direction of the resultant force
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: inertia force is applied in the direction opposite to the resultant force

Explanation:
No explanation is available for this question!
6)   What is the equivalent length of simple pendulum, when compound pendulum is converted into simple pendulum?

a. le = (k + l ) / l
b. le = l2 / (k2 + l2)
c. le = (k2 + l2) / l
d. none of the above
Answer  Explanation 

ANSWER: le = (k2 + l2) / l

Explanation:
No explanation is available for this question!
7)   A connecting rod has periodic time of 1.5 sec/cycle for one oscillation. Calculate radius of gyration, when centre of gravity is at a distance of 500 mm from the small end.

a. 0.1325 m
b. 0.1719 m
c. 0.0295 m
d. 0.555 m
Answer  Explanation 

ANSWER: 0.1719 m

Explanation:
No explanation is available for this question!
8)   Trifilar suspension system is used to determine mass moment of inertia of

a. disc
b. flywheel
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!
9)   Which formula is used to calculate correction couple?

a. Tc = ml1 (l3 - l2) α
b. Tc = ml1 (l3 - l2) α2
c. Tc = ml1 (l3 + l2) α
d. none of the above
Answer  Explanation 

ANSWER: Tc = ml1 (l3 - l2) α

Explanation:
No explanation is available for this question!
10)   On which factors does law of friction depend?

a. Nature of material
b. Area of contact between surfaces
c. Velocity of sliding
d. All of the above
Answer  Explanation 

ANSWER: Nature of material

Explanation:
No explanation is available for this question!
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