A&P POWER PLANT
RECIPROCATING ENGINES
PRACTICE TEST
COMPLETE 100
Question 1: Which characteristic is commonly used to classify a conventional
reciprocating aircraft engine?
Choices:
1) Cylinder arrangement relative to the crankshaft 2) Propeller blade material 3) Fuel octane color 4) Magneto rotation direction
Correct Answer: Cylinder arrangement relative to the crankshaft
Explanation: Reciprocating engines are commonly classi�ed by cylinder arrangement, such as opposed, radial, in-line, or V-type, and also by cooling method.Page 1
Question 2: What is a principal aerodynamic advantage of a horizontally opposed
engine compared with a large radial engine of similar power?
Choices:
1) Higher compression ratio in every installation 2) No need for cylinder cooling 3) Elimination of a crankshaft 4) Smaller frontal area
Correct Answer: Smaller frontal area
Explanation: Horizontally opposed engines present a relatively small frontal area, which makes streamlined installations easier.
Question 3: In a single-row radial engine, the cylinders are arranged
Choices:
1) in two opposed banks at 180 degrees 2) in a straight line above the crankshaft 3) around the crankcase in one plane 4) in a V with a common cylinder head
Correct Answer: around the crankcase in one plane
Explanation: A single-row radial places its cylinders around the crankcase in one plane radiating from the crankshaft centerline.Page 2
Question 4: A horizontally opposed aircraft engine is best described as having
cylinders
Choices:
1) in concentric rows around a master rod 2) on opposite sides of the crankcase 3) stacked vertically above the crankshaft 4) only on one side of the crankcase
Correct Answer: on opposite sides of the crankcase
Explanation: Opposed engines have cylinders arranged in two banks on opposite sides of the crankcase.
Question 5: Which engine arrangement is most associated with a master-and-
articulating connecting rod system?
Choices:
1) Radial 2) Horizontally opposed 3) In-line inverted 4) V-type with fork-and-blade rods only
Correct Answer: Radial
Explanation: Radial engines commonly use a master rod with articulating rods to connect several pistons to a single crankpin.Page 3