## TORSION MCQs

Total Questions : 149 | Page 1 of 15 pages
Question 1. The moment of inertia of a plane area with respect to an axis ____________ to the plane is called a polar moment of inertia.
1.    Parallel
2.    Perpendicular
3.    Equal
4.    Opposite
Question 2. What is the polar modulus for solid shaft?
1.    π/16 D²
2.    π/12 D³
3.    π/ 16 D³
4.    π/16 D
Answer: Option C. -> π/ 16 D³
Question 3. What are the units of Polar modulus?
1.    mm³
2.    mm²
3.    mm
4.    mm⁴
Question 4. A hollow shaft outside diameter 120 mm and thickness 20 mm. Find polar moment of inertia.
1.    16.36 × 10⁶ mm⁴
2.    18.45 × 10⁶ mm⁴
3.    21.3 × 10⁶ mm⁴
4.    22.5 × 10⁶ mm⁴
Answer: Option A. -> 16.36 × 10⁶ mm⁴
Question 5. Calculate the polar moment of inertia for a solid circular shaft of 30 mm diameter.
1.    76m⁴
2.    79.5m⁴
3.    81m⁴
4.    84m⁴
Question 6. A circular shaft of diameter 30 mm is tested under torsion the gauge length of test specimen is 300 mm. A torque of 2kNm produces an angle twist of 1°. Calculate CJ.
1.    0.432 × 10⁶ N/mm²
2.    0.324 × 10⁶ N/mm²
3.    0.46 × 10⁶ N/mm²
4.    0.532 × 10⁶ N/mm²
Answer: Option A. -> 0.432 × 10⁶ N/mm²
Question 7. ________ should be taken below the deepest scour level.
1.    Foundation
2.    Sub structure
3.    Structure
4.    Parapet
Question 8. When the gross length is more than 6 metres between the face of abutment it is called as ________
1.    Cause way
2.    Bridge
3.    Culvert
4.    Cassion
Question 9. __________ has perfect control on river flow.
1.    Barrage
2.    Weir
3.    Marginal bunds
4.    Guide banks