RECIPROCATING ENGINE PART 1

At what speed must a crankshaft turn if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute?. 800 RPM. 1,600 RPM. 400 RPM.

If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a slight. increase in manifold pressure. bump in propeller RPM. drop in torque meter pressure indication.

Which condition would be the least likely to be caused by failed or failing engine bearings?. Excessive oil consumption. High oil temperatures. Low oil temperatures.

Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances?. The valves will not seat positively during start and engine warmup. The further decrease in valve clearance that occurs as engine temperatures increase will cause damage to the valve-operating mechanism. The valves will remain closed for longer periods than specified by the engine manufacturer.

An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, provided the RPM is unchanged, will. lose power due to the reduced volume of air drawn into the cylinders. produce constant power due to the same volume of air drawn into the cylinders. lose power due to the reduced density of the air drawn into the cylinders.

How many of the following are factors in establishing the maximum compression ratio limitations of an aircraft engine?. Design limitations of the engine, the degree of supercharging, and spark plug reach. Detonation characteristics of the fuel, design limitations of the engine, and spark plug reach. Detonation characteristics of the fuel, design limitations of the engine, and the degree of supercharging.

How is proper end-gap clearance on new piston rings assured during the overhaul of an engine?. By accurately measuring and matching the outside diameter of the rings with the inside diameter of the cylinders. By using rings specified by the engine manufacturer. By placing the rings in the cylinder and measuring the end gap with a feeler gauge.

What is the purpose of a power check on a reciprocating engine?. To check magneto drop. To determine satisfactory performance. To determine if the fuel/air mixture is adequate.

Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted. before the stop at the control lever is reached in both HOT and COLD positions. before the stop at the control lever is reached in the HOT position and after the stop at the control lever is reached in the COLD position. after the stop at the control lever is reached in both HOT and COLD positions.

Which type of bearings are generally used for connecting rods and cam shafts?. Plain. Roller. Ball.

What is the basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller?. Reduce the RPM, then the manifold pressure. Reduce the manifold pressure, then retard the throttle to obtain the correct RPM. Reduce the manifold pressure, then the RPM.

What tool is generally used to measure the crankshaft rotation in degrees?. Dial indicator. Timing disk. Prop Protractor.

If an engine with a stroke of 6 inches is operated at 2,000 RPM, the piston movement within the cylinder will be. at maximum velocity around TDC. constant during the entire 360° of crankshaft travel. at maximum velocity 90° after TDC.

A characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engines is that the. shock mounts eliminate the torsional flexing of the powerplant. engine attaches to the shock mounts at the engine's center of gravity. shock mounts point toward the engine's center of gravity.

Which bearing is least likely to be a roller or ball bearing?. Rocker arm bearing (overhead valve engine). Master rod bearing (radial engine). Crankshaft main bearing (radial engine).

Using the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated. Intake opens 15°: BTDC. Exhaust opens 70°: BBDC. Intake closes 45°: ABDC. Exhaust closes 10°: ATDC. 290°. 245°. 25°.

During the inspection of an engine control system in which push-pull control rods are used, the threaded rod ends should. ensure that the safety wire passes thru the hole in shank of the rod-end. be checked for thread engagement of at least two threads but not more than four threads. be checked for the amount of thread engagement by means of the inspection holes.

During ground check an engine is found to be rough-running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM. The trouble may be caused by. several spark plugs fouled on different cylinders. a leak in the intake manifold. a dead cylinder.

The five events of a four-stroke cycle engine in the order of their occurrence are. intake, ignition, compression, power, and exhaust. intake, compression, power, ignition, and exhaust. intake, compression, ignition, power, and exhaust.

Which statement is true regarding bearings used in high-powered reciprocating aircraft engines?. The outer race of a single-row, self-aligning ball bearing will always have a radius equal to the radius of the balls. There is less rolling friction when ball bearings are used than when roller bearings are employed. Crankshaft bearings are generally of the ball-type due to their ability to withstand extreme loads without overheating.

The operating temperature valve clearance of a radial engine as compared to cold valve clearance is. greater. less. the same.

What is the best indication of worn valve guides?. High oil consumption. Low compression. Low oil pressure.

If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine?. The valves will open early and close early. The valves will open late and close early. The valves will open early and close late.

During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water-mixed degreasers primarily because. solvent degreasers are much more effective. water-mixed degreaser residues may cause engine oil contamination in the overhauled engine. water-mixed degreasers cause corrosion.

If metallic particles are found in the oil filter during an inspection,. it is an indication of normal engine wear unless the particles are nonferrous. the cause should be identified and corrected before the aircraft is released for flight. it is an indication of normal engine wear unless the deposit exceeds a specified amount.

Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by. rocker arm adjustment. rocker arm replacement. push rod replacement.

If the oil pressure of a cold engine is higher than at normal operating temperatures, the. oil system relief valve should be readjusted. engine's lubrication system is probably operating normally. oil dilution system should be turned on immediately.

To reduce the power output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, the. manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control. manifold pressure is reduced with the propeller control before the RPM is reduced with the throttle control. RPM is reduced with the propeller control before the manifold pressure is reduced with the throttle control.

Ignition occurs at 28° BTDC on a certain four-stroke cycle engine, and the intake valve opens at 15° BTDC. How many degrees of crankshaft travel after ignition does the intake valve open? (Consider one cylinder only.). 707°. 373°. 347°.

The primary concern in establishing the firing order for an opposed engine is to. provide for balance and eliminate vibration to the greatest extent possible. keep power impulses on adjacent cylinders as far apart as possible in order to obtain the greatest mechanical efficiency. keep the power impulses on adjacent cylinders as close as possible in order to obtain the greatest mechanical efficiency.

When is the air-fuel mixture ignited in a conventional reciprocating engine?. When the piston has reached top dead center of the intake stroke. Shortly before the piston reaches the top of the compression stroke. When the piston reaches top dead center on the compression stroke.

If the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in. improper scavenging of exhaust gases. engine kickback. backfiring into the induction system.

What special procedure must be followed when adjusting the valves of an engine equipped with a floating cam ring?. Adjust valves when the engine is hot. Adjust all exhaust valves before intake valves. Eliminate cam bearing clearance when making valve adjustment.

Excessive valve clearances will cause the duration of valve opening to. increase for both intake and exhaust valves. decrease for both intake and exhaust valves. decrease for intake valves and increase for exhaust valves.

Excessive valve clearance results in the valves opening. late and closing early. early and closing late. late and closing late.

Which of the following statements is true?. Cast iron piston rings may be used in chrome-plated cylinders. Chrome-plated rings may not be used in plain steel cylinders. Cast iron piston rings may not be used in chrome-plated cylinders.