Day 1 Lecture 1 Progress Check

Question 1

What is the main metric used to describe the fuel economy of aircraft engines?

Answer 1

Specific weight

Question 2

What is the primary output of all aircraft powerplants?

Answer 2

Thrust

Question 3

Which type of aircraft engine accelerates a smaller quantity of air but at a much higher velocity?

Answer 3

Turbojet

Question 4

Why is the turbojet engine seldom used in modern aircraft?

Answer 4

Noise and fuel inefficiencies

Question 5

Which engine type is known for having a low weight-to-horsepower ratio and being suitable for horizontal installation on aircraft wings?

Answer 5

Opposed or O-Type Engine

Question 6

Which engine type is common in small general aviation aircraft?

Answer 6

Horizontally opposed reciprocating piston

Question 7

Which type of reciprocating engine has cylinders below the crankshaft?

Answer 7

Inverted Inline Engine

Question 8

At what speed range do reciprocating and turboprop engines generally offer better fuel economy than pure turbojet or turbofan engines?

Answer 8

180 to 350 mph

Question 9

What principle does aircraft propulsion primarily follow?

Answer 9

Newton’s third law

Question 10

In the context of aircraft engines, what does reliability measure?

Answer 10

Mean time between failures