# Multiple Choice Questions (MCQ) with Answers on Torsion

Multiple Choice Questions (MCQ) with Answers on Torsion

1-A shaft is said to be in pure torsion if

1. Turning moment is applied at one end and other end is free
2. Turning force is applied at one end and other end is free
3. Two opposite turning moments are applied to the shaft
4. Combination of torsional load and bending load is applied to the shaft

(Ans: c)

2-In power transmission equation, P=2ΠNT/60×1000

1. P is in kw and T is maximum torque
2. P is in NM/sec and T is maximum torque
3. P is in NM/sec and T is mean torque
4. P is in kw and T is mean torque

(Ans: d)

3-Which property is not required for shaft materials?

1. High shear and tensile strength
2. Good machinability
3. High fatigue strength
4. Good castability

(Ans: d)

4-Which material is suitable for shaft material?

1. High speed steel
2. Stainless steel or high carbon steel
3. Grey cast iron
4. Steel having approx. 0.4% carbon and 0.8% manganese

(Ans: d)

5-If diameter of a shaft is doubled the power transmitted capacity will be

1. Either twice or half
2. Four times
3. Eight times
4. Same

(Ans: c)

6-Two shafts in torsion will have equal strength if

1. Only diameter of the shafts is same
2. Only angle of twist of the shaft is same
3. Only material of the shaft is same
4. Only torque transmitting capacity of the shaft is same

(Ans: d)

7-Which of the following is not designed under torsion equation?

1. Spindle
2. Axle
3. Low cost shaft
4. Shaft with variable diameter

(Ans: b)

8-Which of the following is incorrect?

1. In torsion equation, we use mean torque
2. In torsion equation, we use maximum torque
3. Many shafts are designed under combined bending and torsion load
4. Shafts are also designed for torsional rigidity

(Ans: a)

9-Which of the following is incorrect?

1. In a solid shaft maximum shear stress occurs at radius = radius of shaft
2. In a solid shaft maximum shear stress occurs at center
3. In a hollow shaft maximum shear stress occurs at outer radius
4. In a hollow shaft minimum shear stress occurs at inner radius

(Ans: b)

10-The following option is correct

1. There is neither advantage nor disadvantage in transmitting power at high speed
2. There is advantage in transmitting power at high speeds
3. There is disadvantage in transmitting power at high speeds
4. There is advantage in transmitting power at high speed provided shafts are made of high speed steel

(Ans: b)