250+ TOP MCQs on IC Engine – Cross-Section for Connecting Rod and Answers

Automotive Engine Design Interview Questions and Answers for Experienced people on “IC Engine – Cross-Section for Connecting Rod”.

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1. In the formula P=P_ccos∅, what is P_c?
a) The pressure acting on the camshaft
b) Force acting on the camshaft
c) The pressure acting on connecting rod
d) Force acting on connecting rod
Answer: d
Clarification: In the formula P=P_ccos∅, P is the force acting on the piston, P_c is the force acting on connecting rod and ∅ is the angle of inclination of connecting rod with the line of stroke.

2. Find the force acting on the piston when the force acting on connecting rod is 40N and the angle of inclination is 20°?
a) 35N
b) 30KN
c) 37.5N
d) 40KN
Answer: c
Clarification: Force acting on piston is P_e=P_ccos∅
= 40×cos20
= 37.5N

3. Find the cross-sectional area of the connecting rod when the thickness of the web is 15mm?
a) 2651mm²
b) 1265mm²
c) 2475mm²
d) 2561mm²
Answer: c
Clarification: A=11t²
=11×15²
=2475mm²

4. Find the radius of gyration when the thickness of the web is 15mm?
a) 26.7mm
b) 17.6mm
c) 19.7mm
d) 28.6mm
Answer: a
Clarification: Radius of gyration K_xx=1.78t
= 1.78×15
= 26.7mm

5. Which of the mentioned below is the Rankine’s formula?
a) P_cr=(frac{A}{1+a(frac{L}{K_{xx}})})
b) P_cr=(frac{sigma_cA}{1+a(frac{L}{K_{xx}})})
c) P_cr=(frac{A^2}{1+a(frac{L}{K_{xx}})})
d) P_cr=(frac{sigma_cA^2}{1+a(frac{L}{K_{xx}})})
Answer: b
Clarification: The Rankine’s formula is given by P_cr=(frac{sigma_cA}{1+a(frac{L}{K_{xx}})}) where p_c is the force on connecting rod, A is the cross-sectional area, L is the length of connecting rod, a is end fixity coefficient, σ_c is stress and K_xx is the radius of gyration.

6. In the formula P_cr=(frac{sigma_c A}{1+a(frac{L}{K_{xx}})}) what is K_xx?
a) Radius of cylinder
b) Constant
c) Radius of gyration
d) The radius of the big end
Answer: c
Clarification: Here p_c is the force on connecting rod, A is the cross-sectional area, L is the length of connecting rod, a is end fixity coefficient, σ_c is stress and K_xx is the radius of gyration.

7. What is the height of the connecting rod at the middle section when t=25mm?
a) 125mm
b) 225mm
c) 95mm
d) 150mm
Answer: a
Clarification: Height of the connecting rod at the middle section is H=5t
= 5×25 = 125mm

8. What is the Height of connecting rod at the small end when H=125mm?
a) 50.85 to 90.60mm
b) 100.5 to 130.89mm
c) 105 to 122.6mm
d) 93.75 to 112.5mm
Answer: d
Clarification: Height of connecting rod at the small end is H₁=0.75H to 0.9H
= 0.75×125 to 0.9×125
= 93.75 to 112.5mm

9. What is the Height of connecting rod at the big end when H=125mm?
a) 135 to 180.25mm
b) 124.56 to 160mm
c) 135.5 to 156.25mm
d) 110.89 to 111.90mm
Answer: c
Clarification: Height of connecting rod at the big end is H₂= 1.1H to 1.25H
= 1.1×125 to 1.25×125
= 135.5 to 156.25mm

10. In which lubrication system oil is fed under high pressure?
a) Splash system
b) Pressure feed system
c) Lift system
d) Feed system
Answer: b
Clarification: In the Pressure feed lubrication system the oil is pumped under high pressure using a pump connected to crankshaft and oil lines.This system is used mainly in car engines for better cooling.

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