This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Engine Parts – Set 2”.
1. The connecting rod connects the piston to the crankshaft.
a) True
b) False
View Answer
Explanation: A link connecting the piston and the crankshaft is connecting rod. The larger end is fastened through bearing to the crankshaft. The rod is made up of aluminium.
2. Where is the compression ring placed?
a) To the bottom of the piston
b) At the top of the piston
c) At the middle of the piston
d) Under the piston
View Answer
Explanation: There are two or more compression rings fitted into the circumferential slot or groove at the top of the piston. The rings tend to extend and it seals the gap between the piston and cylinder. So it can prevent the leakage of gases from the combustion chamber.
3. Which compression ring has a wider bottom?
a) Rectangular ring
b) Scraper ring
c) Tapered ring
d) Wider ring
View Answer
Explanation: A tapered face ring has a bit wider bottom compared to its top width with a tapered face. This makes good sealing of the ring and also steady contact with the cylinders at the lower side. The rectangular ring has a bearing surface. The ring with a lower outer edge cut is called a scraper ring.
4. The piston rings are completely connected rings.
a) True
b) False
View Answer
Explanation: The rings ends are not connected deeply i.e. the rings have a very small gap(open ends). This is to avoid the sticking of rings to cylinders. There are few other types of joints such as butt joint, lap joint, angle joint and joint seal. There is a special circled plier for installing the rings on the piston.
5. Which is used for connecting the connecting rod to the piston?
a) Rod pin
b) Piston pin
c) Nuts and bolts
d) Hook pin
View Answer
Explanation: The piston pin is a structure which fastens the small end of the connecting rod into the piston. It has various designs according to the effective functions of it. The pin has a bearing inside. It is also called a wrist pin or gudgeon pin.
6. What is the use of the feeler gauge?
a) Clearance measuring
b) Force measurement
c) Power checking
d) Weighing
View Answer
Explanation: The feeler gauge is a device for measuring practically smaller gaps i.e. clearances in the engines. It consists of number of metal blades with varying measurements denoted on them. It is used for measuring valve clearance. It has tapered and parallel types of blades.
7. Which configuration of piston pin is set free to move fully?
a) Semi floating
b) Fully floating
c) Fixed pin
d) Semi fixed pin
View Answer
Explanation: This full-floating pin has bearings in both the connecting rod and the piston. So the pin moves in both the rod and piston. The semi-floating pin is fixed to the rod and can move in the piston.
8. Which element is used for transmitting the force of power stroke to the crankshaft?
a) Camshaft
b) Piston
c) Piston pin
d) Piston ring
View Answer
Explanation: Piston is a cylindrical structure made of metal for transmission of force resulting from power stroke through the connecting rod. The top is head, which may be flat or concave. It consists of ring grooves and lands. The bottom part is called as piston skirt, which bears the thrust. It should have a high wear resistance.
9. Identify the type of the engine from the diagram.
a) V-engine
b) Inline engine
c) Horizontal engine
d) External combustion engine
View Answer
Explanation: It is a basic type of engine where all the cylinders are fitted in a straight line in the block. Most of the tractors use this kind of engine construction. It is often called as straight engine. The V type engines are the engines with two separate banks for housing cylinders and pistons aligned in V – shape.
10. Which of the following is the mushroom-shaped valve used in tractors?
a) Poppet valve
b) Long valve
c) Short valve
d) Standard valve
View Answer
Explanation: Poppet valve is a valve used as inlet and exhaust valves in tractor engines. It consists of a tapered plug, valve seat, valve stem and valve spring. It has a vertical movement of operation. The valves are subjected to higher temperature operation and so they are made of special alloy with a higher amount of nickel and chromium.
11. What is the metal cylinder-like structure fitted in the valve upon the cam in L-head engines?
a) Crankpin
b) Counterweight
c) Lifter
d) Push rod
View Answer
Explanation: The valve lifter is lifted by the rotation of the camshaft. The valve is in connection with the cams of the camshaft. It is located slightly off the centre of the cam. The pushrod is transmitting the motion to the rocker arm for opening and closing of valves.
12. How the piston ring fixed below the compression ring is known as?
a) Secondary ring
b) Alloy ring
c) Cylinder ring
d) Oil ring
View Answer
Explanation: Oil ring or oil control ring is placed below the compression rings on the piston. It removes the excess oil from the cylinder wall and backing it to the sump. It also prevents the flow of excessive oil into the combustion chamber.
Sanfoundry Global Education & Learning Series – Farm Tractor.
To practice all areas of Farm Tractor, here is complete set of Multiple Choice Questions and Answers.
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