# Automotive Engine Components Design Questions and Answers – IC Engine – Cross-Section for Connecting Rod

«
»

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

1. In the formula P=Pccos∅, what is Pc?
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

Explanation: In the formula P=Pccos∅, P is the force acting on the piston, Pc 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

Explanation: Force acting on piston is Pe=Pccos∅
= 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

Explanation: 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

= 1.78×15
= 26.7mm

5. Which of the mentioned below is the Rankine’s formula?
a) Pcr=$$\frac{A}{1+a(\frac{L}{K_{xx}})}$$
b) Pcr=$$\frac{\sigma_cA}{1+a(\frac{L}{K_{xx}})}$$
c) Pcr=$$\frac{A^2}{1+a(\frac{L}{K_{xx}})}$$
d) Pcr=$$\frac{\sigma_cA^2}{1+a(\frac{L}{K_{xx}})}$$

Explanation: The Rankine’s formula is given by Pcr=$$\frac{\sigma_cA}{1+a(\frac{L}{K_{xx}})}$$ where pc is the force on connecting rod, A is the cross-sectional area, L is the length of connecting rod, a is end fixity coefficient, σc is stress and Kxx is the radius of gyration.
Participate in Automotive Engine Design Certification Contest of the Month Now!

6. In the formula Pcr=$$\frac{\sigma_c A}{1+a(\frac{L}{K_{xx}})}$$ what is Kxx?
b) Constant
d) The radius of the big end

Explanation: Here pc is the force on connecting rod, A is the cross-sectional area, L is the length of connecting rod, a is end fixity coefficient, σc is stress and Kxx 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

Explanation: 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

Explanation: 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

Explanation: 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

Explanation: 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.

Sanfoundry Global Education & Learning Series – Automotive Engine Components Design.

To practice all areas of Automotive Engine Design for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.