Jet Engines Trivia
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47 free Jet Engines trivia questions with answers — technology quiz, new questions added Oct 2026.
Jet engines trivia for aviation geeks, engineering students, plane spotters and anyone who has stared out of a window seat wondering how the thing works. The quiz covers the race to invent the turbojet - Frank Whittle's 1930 patent and the £5 renewal fee he could not afford, Hans von Ohain's hydrogen-fuelled test engine, the Heinkel He 178's six-minute first flight in August 1939, the Me 262 and Gloster Meteor entering service within months of each other in 1944. Then it gets technical without getting cruel: what a bypass ratio means, why turbofans beat turbojets at airliner speeds, what an afterburner burns, why ramjets have no moving parts and scramjets barely work, the Brayton cycle, the first production turbofan and the monster GE90 and GE9X on Boeing's 777s. There are also questions on the de Havilland Comet, Concorde's Olympus engines, the V-1's pulsejet, the X-43A's Mach 9.6 and how reliable modern engines have become. Expect a range from easy to genuinely nerdy. Every answer has been checked against a reference page and each question shows its source once you have answered.
30 of 47 questions with answers and explanations. Play the quiz
Q 01Which fighter takes off vertically by swivelling the four nozzles of its Pegasus turbofan?
Hawker Siddeley Harrier
The Hawker Siddeley Harrier points its Pegasus engine's four nozzles down to lift off and back to fly; needing no runway, it could be dispersed in wartime away from airfields that were open to attack.
Q 02Which German physicist designed the turbojet that became the first to power an aircraft in flight?
Hans von Ohain
Hans von Ohain built his first model with a garage mechanic, Max Hahn; unlike Whittle, he had an aircraft maker funding his work from 1936, and his engine flew in 1939.
Q 03What was the world's first aircraft to fly purely on turbojet power, on 27 August 1939?
Heinkel He 178
The Heinkel He 178 made the first purely turbojet flight at Rostock-Marienehe on 27 August 1939; air ministry officials who watched a later demonstration were reportedly unimpressed, and it stayed a one-off experiment.
Q 04What was the world's first operational jet fighter, powered by Junkers Jumo 004 engines?
Messerschmitt Me 262
The Messerschmitt Me 262 Schwalbe entered service with Erprobungskommando 262 in April 1944, months before any Allied jet; Hitler insisted it also be reworked as a fighter-bomber.
Q 05Which British jet fighter was the only Allied jet aircraft to see combat in the Second World War?
Gloster Meteor
The Gloster Meteor joined 616 Squadron in July 1944, but its pilots were long forbidden to fly over enemy-held territory in case a downed jet handed its secrets to the Germans or the Soviets.
Q 06Why did Whittle's original jet engine patent lapse in January 1935?
He could not afford the £5 renewal fee
Whittle let the patent lapse in January 1935 because he could not afford the £5 renewal fee and the Air Ministry declined to pay it; Cranwell friends helped him found a company the next year.
Q 07What was the name of the company Whittle formed with two retired RAF servicemen to build his engine?
Power Jets Ltd
Power Jets Ltd was formed in 1936 with retired officers Rolf Dudley-Williams and James Tinling; its WU engine first ran on 12 April 1937 and the firm was nationalised in 1944.
Q 08What was the first British aircraft to fly with a turbojet, on 15 May 1941?
Gloster E.28/39
The Gloster E.28/39 flew officially from RAF Cranwell on 15 May 1941 with Gerry Sayer at the controls; weeks earlier it had already left the ground in short hops during taxi tests.
Q 09What was the first US-built jet aircraft, powered by American copies of a British engine?
Bell P-59 Airacomet
The Bell P-59 Airacomet first flew in October 1942 on GE-built copies of a Whittle engine flown over from Britain; on the ground it wore a dummy propeller to hide the secret that it needed none.
Q 10Jumo 004 designer Anselm Franz later led work on the turbine engine of which US tank?
M1 Abrams
The M1 Abrams runs on the 1,500-horsepower AGT1500, which grew out of a tank turbine project Franz led at Lycoming in the 1960s; being a turbine, it can burn several fuels, from diesel to jet fuel.
Q 11What is the name of the thermodynamic process gas-turbine jet engines operate on?
The Brayton cycle
The Brayton cycle is named for American engineer George Brayton, who built piston engines on the principle from 1872, decades before anyone got a gas turbine to run.
Q 12Which component gives a high-bypass airliner engine most of its thrust?
A large fan that pushes air around the core
A large fan that pushes air around the core supplies most of the thrust; that slower bypass air is what makes a turbofan far more efficient than a turbojet at airliner speeds.
Q 13Which airliner, in service from 1970 with four JT9D engines, first carried passengers on high-bypass turbofans?
Q 21Which German weapon that struck London from June 1944 was propelled by an Argus pulsejet?
The V-1 flying bomb
The V-1 flying bomb's pulsejet fired about 50 times a second, a drone Londoners learned to fear less than the sudden silence that meant the engine had cut out and the bomb was coming down.
Q 22What does an afterburner do?
Sprays extra fuel into the hot exhaust
An afterburner sprays extra fuel into the hot exhaust, where it burns for a burst of thrust; it drinks fuel so fast that pilots light it only for take-off, combat or going supersonic.
Q 23What was the world's first commercial jet airliner, which entered service in 1952?
Boeing 747
The Boeing 747 entered service in January 1970 on Pratt & Whitney JT9Ds, an engine that Boeing and the engine maker had teamed up to develop specially for the new jumbo.
Q 14What was the world's first production turbofan engine?
Rolls-Royce Conway
The Rolls-Royce Conway was the first turbofan to enter service, around 1960, but with a bypass ratio of only about 0.3 it was soon overtaken by American engines with bigger fans.
Q 15Which aircraft was the first production high-bypass turbofan, the GE TF39, designed to power?
Lockheed C-5 Galaxy
GE designed the TF39 for the Lockheed C-5 Galaxy, promising twice the power of any jet engine then running; its core went on to become the CF6 used on wide-body airliners.
Q 16Which airliner engine is rated at about 115,000 lbf of thrust?
General Electric GE90
The General Electric GE90-115B is rated at about 115,000 lbf and reached 127,900 lbf on test, a record at the time; it became the only engine offered on the longest-range versions of its twin-jet.
Q 17The General Electric GE9X was developed exclusively for which airliner?
Boeing 777X
The GE9X was built solely for the Boeing 777X and set a thrust record of 134,300 lbf on test, but a compressor redesign in 2019 pushed the airliner's first flight back to January 2020.
Q 18What is the simplest type of air-breathing jet engine, having no moving parts in the engine proper?
The ramjet
A ramjet has no moving parts in the engine proper; it relies on the vehicle's forward speed to compress intake air, so it cannot produce thrust from a standstill.
Q 19What is the defining feature of a scramjet?
Air stays supersonic through the combustor
Air stays supersonic through the combustor instead of being slowed down first, which only pays off above about Mach 5; a scramjet makes no thrust at low speed, so test vehicles ride a rocket booster first.
Q 20Which NASA scramjet test vehicle reached nearly Mach 10 in 2004, a record for an air-breathing aircraft?
X-43A
The X-43A hit about Mach 9.6, nearly 7,000 mph, on 16 November 2004; a carrier aircraft and a rocket booster took it to speed, and its scramjet then burned for only about ten seconds.
De Havilland Comet
The de Havilland Comet entered BOAC service in May 1952 with four Ghost turbojets buried in the wing roots; three fatal in-flight break-ups in 1953–54 grounded it and handed the market to American rivals.
Q 24What phenomenon, poorly understood at the time, made two early jet airliners break up in flight in 1954?
Metal fatigue
Metal fatigue cracked the pressurised cabin skin at the corners of cut-outs; investigators proved it by sinking a whole fuselage in a water tank and pressurising it again and again until it split.
Q 25The aeolipile described by Hero of Alexandria, often called the first reaction engine, spun on jets of what?
Steam
Steam from a heated vessel shot out of two bent nozzles and spun the sphere by the same action and reaction that drives a jet; described in the first century AD, and no practical use of it is recorded.
Q 26US Airways Flight 1549 ditched in the Hudson River in 2009 after both engines swallowed which birds?
Canada geese
Canada geese, identified from remains in the engines, are heavier than the birds an airliner engine is built to swallow and keep running; both engines failed at about 2,800 feet, yet all 155 aboard survived.
Q 27What did British Airways Flight 9 fly through in 1982 that stopped all four of its engines?
A cloud of volcanic ash
A cloud of volcanic ash from Indonesia's Mount Galunggung melted inside the engines and choked them; as the airliner glided down into clear air the ash hardened and broke away, and the crew restarted all four.
Q 28The white contrails behind high-flying jets form mainly from which product of burning jet fuel?
Water vapour
Water vapour in the exhaust condenses and freezes into ice crystals in the cold air at cruising height; a trail may vanish in seconds in dry air or linger and spread when the air is humid.
Q 29What was the first production afterburning turbofan, which powered the F-111 Aardvark and F-14 Tomcat?
Pratt & Whitney TF30
The Pratt & Whitney TF30 was the first production afterburning turbofan, powering the F-111 from 1967 and the original F-14A; later Tomcats switched to the GE F110.
Q 30Which Soviet interceptor exceeded Mach 2.8 on two Tumansky R-15 turbojets?
MiG-25
The MiG-25's two Tumansky R-15 turbojets pushed it past Mach 2.8; Viktor Belenko's 1976 defection to Japan let Western engineers examine one closely.