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! ! ! Set-2

Reciprocating Engine

QuestionAnswer
1.If the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in a. engine kickback. b. backfiring into the induction system. c. improper scavenging of exhaust gases. b
2.Which statement is correct regarding a four-stroke cycle aircraft engine? a. The exhaust valve opens on the exhaust stroke. b. The intake valve closes on the intake stroke. c. The intake valve closes on the compression stroke. c
3.Which of these conditions will cause an engine to have an increased tendency to detonate? 1. High manifold pressure. 2. High intake air temperature. 3. Engine overheated. 4. Late ignition timing. a. 1, 4. b. 1, 2, 3. c. 1, 2, 3, 4. b
4.During the inspection of an engine control system in which push-pull control rods are used, the threaded rod ends should a. insure that the safety wire passes thru the hole in shank of the rod-end. b. be checked for the amount of thread engagement by means of the inspection holes. c. be checked for thread engagement of at least two threads but not more than four threads. b
5.What tool is generally used to measure the crankshaft rotation in degrees? a. Dial indicator. b. Timing disk. c. Prop Protractor. b
6.Standard aircraft cylinder oversizes usually range from 0.010 inch to 0.030 inch. Oversize on automobile engine cylinders may range up to 0.100 inch. This is because aircraft engine cylinders a. operate at high temperatures. b. have relatively thin walls and may be nitrided. c. have more limited cooling capacity. b
7.Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted: a. after the stop at the control lever is reached in both HOT and COLD positions. b. before the stop at the control lever is reached in both HOT and COLD positions. c. 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. b
8.Which statement is correct regarding engine crankshafts? a. Moveable counterweights serve to reduce the dynamic vibrations in an aircraft reciprocating engine. b. Moveable counterweights serve to reduce the torsional vibrations in an aircraft reciprocating engine. c. Moveable counterweights are designed to resonate at the natural frequency of the crankshaft. b
9. The floating control thermostat, used on some reciprocating engine installations, helps regulate oil temperature by a. controlling air flow through the oil cooler. b. controlling oil flow through the oil cooler. c. recirculating hot oil back through the sump. a
10.If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine? a. The valves will open late and close early. b. The valves will open early and close early. c. The valves will open early and close late. a
11.Which condition would be the least likely to be caused by failed or failing engine bearings? a. High oil temperatures. b. Low oil temperatures. c. Excessive oil consumption. b
12.During routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to the magnetic drain plug is discovered in the oil sump and on the surface of the oil filter. a. is probably a result of ring and cylinder wall wear and is cause for engine removal and/or overhaul. b. is normal in engines utilizing plain type bearings and aluminum pistons and is not cause for alarm. c. may be a result of abnormal plain type bearing wear and is cause for furt c
13.When does valve overlap occur in the operation of an aircraft reciprocating engine? a. At the end of the compression stroke and the beginning of the power stroke. b. At the end of the exhaust stroke and the beginning of the intake stroke. c. At the end of the power stroke and the beginning of the exhaust stroke. b
14.Some cylinder barrels are hardened by a. tempering. b. shot peening. c. nitriding. c
15.Master rod bearings are generally what type? a. Ball. b. Plain. c. Roller. b
16.What is the principal advantage of using propeller reduction gears? a. To enable the engine RPM to be increased with an accompanying increase in power and allow the propeller to remain at a lower, more efficient RPM. b. To enable the engine RPM to be increased with an accompanying increase in propeller RPM. c. To enable the propeller RPM to be increased without an accompanying increase in engine RPM. a
17.A nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of a. 1,283 cubic inches. b. 740 cubic inches. c. 1,425 cubic inches. a
18.Which of the following engine servicing operations generally requires engine pre-oiling prior to starting the engine? a. Replacement of oil lines. b. Engine oil and filter change. c. Engine installation. c
19.What will be the likely result if the piston ring gaps happen to be aligned when performing a differential-pressure compression check on a cylinder? a. Little or no effect. b. A worn or defective ring(s) indication. c. The rings will not be seated. b
20.A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is a. oil-fouled spark plug. b. hydraulic lock. c. valve overlap. b
21.The five events of a four-stroke cycle engine in the order of their occurrence are a. intake, ignition, compression, power, exhaust. b. intake, compression, ignition, power, exhaust. c. intake, power, compression, ignition, exhaust. b
22.Which bearing is least likely to be a roller or ball bearing? a. Crankshaft main bearing (radial engine). b. Rocker arm bearing (overhead valve engine). c. Master rod bearing (radial engine). c
23.Excessive valve clearance in a piston engine a. decreases valve overlap. b. increases valve opening time. c. increases valve overlap. a
24.An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to a. check for one or more cold cylinders. b. perform a compression check. c. check each spark plug. a
25.Cam-ground pistons are installed in some aircraft engines to a. equalize the wear on all pistons. b. provide a better fit at operating temperatures. c. act as a compensating feature so that a compensated magneto is not required. b
Created by: sampizzuto
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