Question 1
Based on which forging technique is the connecting rod forged?
A. Closed die forging
B. Press forging
C. Drop forging
D. Open die forging
View Answer
Answer: Option C
Explanation:
A connecting rod is drop forged component wherein a heavy hammer is dropped from a height of 1-1.5 meters, on to a hot workpiece kept on an anvil. The force of the blow varies from 10-3000 Newtons.
Question 2
Buckling is found in which part of the engine?
A. Intake manifold
B. Piston
C. Connecting rod
D. Glow plug
View Answer
Answer: Option C
Explanation:
Buckling can be experienced in a connecting rod and not in other components. The buckling is the deflection of the connecting rod therefore the buckling stress is found out for each material that is being used for the connecting rod.
Question 3
Cap is attached to which end of the connecting rod?
A. Small end
B. Shank
C. Wrist pin
D. Big end
View Answer
Answer: Option D
Explanation:
Cap is attached to the big end of the bearing holding the crankshaft. Cap is bolted to the big end along with bearings. Cap experiences force during the downward stroke of the piston.
Question 4
For what purpose rifle hole is drilled in connecting rod?
A. Cooling
B. Combustion
C. Lubrication
D. Diffusion
View Answer
Answer: Option C
Explanation:
Rifle hole is the long drilled in the connecting rod that connects the bearings of small end and big end, its major usage is for lubrication.
Question 5
For which to which part is the hole drilled for lubrication in a connecting rod?
A. Piston to crankshaft
B. Piston to connecting rod
C. Small end to big end of the connecting rod
D. Only in piston
View Answer
Answer: Option C
Explanation:
For lubrication, a rifle hole is drilled from the small end of the connecting rod to the big end of the connecting rod. The oil is lifted from the crankcase with higher pressure and lubricates cylinder through oil rings.
Question 6
How many percent of carbon is present in medium carbon steel?
A. 5% to 10%
B. 0.35% to 0.45%
C. 0.73% to 0.85%
D. 20% to 30%
View Answer
Answer: Option B
Explanation:
The medium carbon steels contain 0.35% to 0.45% of carbon content, the alloy steels include nickel-chromium or chromium-molybdenum steels.
Question 7
In splash lubrication, the spout is attached to with part of the connecting rod?
A. Piston
B. Shank
C. Big end
D. Small end
View Answer
Answer: Option C
Explanation:
In splash type lubrication a split is attached to the big end of the connecting rod and set at an angle to the axis of the rod. The spout dip into the sump of lubricating oil during the downward motion of the connecting rod and splashes the oil as the connecting rod moves up.
Question 8
In which type of lubrication system, the spout is present?
A. Pour lubrication
B. Pressure lubrication
C. Splash lubrication
D. Lift lubrication
View Answer
Answer: Option C
Explanation:
In the splash lubrication system, the spout dips into the sump of lubricating oil during the downward motion of the connecting rod and splashes the oil as the connecting rod move upward.
Question 9
The connecting rod is manufactured using which process?
A. Drop forging
B. Slip casting
C. Welding
D. Die casting
View Answer
Answer: Option A
Explanation:
The Connecting rod is manufactured by dropping a die on a red-hot metal. Due to this manufacturing technique, it can withstand high gas pressure.
Question 10
The crankshaft is connected to which end of the connecting rod?
A. Edge of shank
B. Small end
C. Big end
D. Shank
View Answer
Answer: Option C
Explanation:
The big end of the connecting rod is connected to the crankshaft whereas the piston is connected to the small end of the connecting rod, and shank holds both the ends.
Question 11
The part that connects the small end and the big end of the connecting rod is known as ______
A. big end
B. cap
C. shank
D. small end
View Answer
Answer: Option C
Explanation:
The big end of the connecting rod is connected to the crankshaft whereas the piston is connected to the small end of the connecting rod, and the part that connects small end and the big end of the connecting rod is the shank.
Question 12
The piston is connected to which end of the connecting rod?
A. Shank
B. Big end
C. Edge of shank
D. Small end
View Answer
Answer: Option D
Explanation:
Piston is connected to the small end of the connecting rod whereas the big end is connected to the crankshaft, and shank holds both the ends.
Question 13
The rod that transmits reciprocating motion to rotary motion is known as?
A. Camshaft
B. Connecting rod
C. Crankshaft
D. Piston
View Answer
Answer: Option B
Explanation:
The major basic function of the connecting rod is to convert reciprocating motion from the piston to the rotary motion of the crankshaft.
Question 14
The spout dips into oil sump during which motion?
A. Right-ward motion
B. Upward motion
C. Downward motion
D. Left-word motion
View Answer
Answer: Option C
Explanation:
The spout dips into the sump of lubricating oil during the downward motion of the connecting rod and splashes the oil as the connecting rod move upward.
Question 15
The spout is attached to which end of the connecting rod?
A. Big end
B. Small end
C. Shank
D. Wrist pin
View Answer
Answer: Option A
Explanation:
Spout is an extended metal piece appearing as a spoon-like structure. This is connected to the big end of the connecting rod. Spout lifts the oil from oil sump and splash around the cylinder.
Question 16
What is the basic function of the connecting rod?
A. To transmit force from piston to crankshaft
B. To transmit rotary motion from the piston to the crankshaft
C. To transmit oscillation from piston to crankshaft
D. To transmit force from piston to piston pin
View Answer
Answer: Option A
Explanation:
The major basic function of the connecting rod is to transmit the push and pull forces from the piston to the crankshaft. The force is created by the combustion in the Cylinder.
Question 17
What is the percentage of carbon present in a medium carbon steel type connecting rod?
A. 0-0.1
B. 0.1-0.2
C. 0.25-0.35
D. 0.35-0.45
View Answer
Answer: Option D
Explanation:
The material used for the connecting rod is either medium carbon steel or alloy steel. The medium carbon steels contain 0.35-0.45 percentage carbon. The alloy steel includes nickel-chromium or chromium-molybdenum steels.
Question 18
Which are the combination of stresses acting on the connecting rod?
A. Shear and torsion
B. Torsion and tensile
C. Tensile and
D. Axial and bending stresses
View Answer
Answer: Option D
Explanation:
A combination of axial and bending stresses acting on the connecting rod in operation. The axial stresses are produced due to cylinder gas pressure and the inertia force arising on account of reciprocating motion, whereas bending stress caused due to centrifugal.
Question 19
Which are the two types of lubrication system?
A. Lift and splash feed
B. Splash and pressure feed
C. Splash and pour feed
D. Pour and pressure feed
View Answer
Answer: Option B
Explanation:
There are two types of lubrication of bearings at the two ends- splash lubrication system and pressure feed lubrication system.This helps in smooth function and Noiseless.
Question 20
Which force is experienced by connecting rod?
A. Stress
B. Torsion
C. Moment
D. Inertia force
View Answer
Answer: Option D
Explanation:
The connecting rod is subjected to the force of gas pressure and the inertia force of the reciprocating part. Hence, the Inertia force is the right answer.
Question 21
Which material is used in connecting rod?
A. Steel
B. Tin
C. Medium carbon steel
D. Tungsten
View Answer
Answer: Option C
Explanation:
The materials used for the connecting rod are either medium carbon steels or alloy steels. This steel has both carbon and manganese, they are quenched and tempered.
Question 22
Which of the following does the connecting rod connect?
A. Piston and crankshaft
B. Accelerator pedal and venturi
C. Cam and crankshaft
D. Sleeve and cotter
View Answer
Answer: Option A
Explanation:
The connecting rod converts the linear motion of the piston into rotary motion of the crankshaft. The connecting rod connects the piston and the crankshaft. The tensile strength of the connecting rod is in the range if 1034MPa.
Question 23
Which of the following formula is used to find the force acting on the connecting rod neglecting the cos theta angle and position of the connecting rod?
A. Force=Maximum gas pressure ×(π)
B. Force=(π×D/4)
C. Force=(π×D2/4)×maximum gas pressure
D. Force=(D2/4)× Stroke length
View Answer
Answer: Option C
Explanation:
The correct relationship the force acting on the piston is found using Force =(π×D2/4)×maximum gas pressure where D is the cylinder bore, maximum gas pressure is in the range of MPa or N/mm2.
Question 24
Which of the following is defined as whipping stress?
A. Bending stress due to compression
B. Bending stress due to inertia
C. Bending stress due to
D. Bending stress due to torsion
View Answer
Answer: Option B
Explanation:
The small end of the connecting rod is subjected to translation motion and the big end is subjected to pure rotary motion. The intermediate point moves in an elliptical orbit. The lateral oscillation induces inertia that acts all along the length. This type of action is called whipping. The bending stress due to the inertia force is called whipping stress.
Question 25
Which of the following is the proper measurement of the connecting rod length?
A. Length of shank
B. Length between the small end and big end axis
C. Length between the small end and the length of the shank
D. Length between the big end and the length of the shank
View Answer
Answer: Option B
Explanation:
The length of the connecting rod is the length from the small end axis and the big end cap axis of the connecting rod. This length also contains the shank length in it thus the length of the connecting rod is calculated.
Question 26
Which of the following material is used in the manufacturing of the connecting rod?
A. Magnesium
B. Copper
C. Bronze
D. Steel
View Answer
Answer: Option D
Explanation:
The connecting rod is generally made up of drop forging of steel or duralumin. However, with the technology these days cast from malleable or spheroidal graphite cast iron. Forged connecting rods are comparatively cheaper and have less strength.
Question 27
Which of the following shows the correct relationship between critical buckling and force acting on the connecting rod?
A. Critical buckling load = factor of safety ×force on connecting rod
B. Critical buckling load = Factor of safety
C. Critical buckling load = force on the connecting rod
D. Critical buckling load = force on the connecting rod /factor of safety
View Answer
Answer: Option A
Explanation:
The correct relationship between the Critical buckling load and the force acting on the connecting rod is Critical buckling load = factor of safety ×force on connecting rod where critical buckling load is in terms of Newton and factor of safety is usually 5 to 6.