Problem: Stepper motors were and still are often used in computer printers, optical scanners, and digital photocopiers to move the optical scanning element, the print head carriage (of dot matrix and inkjet printers), and the platen or feed rollers. Likewise, many computer plotters (which since the early 1990s have been replaced with large-format inkjet and laser printers) used rotary stepper motors for pen and platen movement; the typical alternatives here were either linear stepper motors or servomotors with closed-loop analog control systems.
In scanners, what do stepper motors move?
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Answer: optical scanning element


Problem: During the dictatorships of Miguel Primo de Rivera (1923–1930) and especially of Francisco Franco (1939–1975), all regional cultures were suppressed. All of the languages spoken in Spanish territory, except Spanish (Castilian) itself, were officially banned. Symbolising the Catalan people's desire for freedom, Barça became 'More than a club' (Més que un club) for the Catalans. According to Manuel Vázquez Montalbán, the best way for the Catalans to demonstrate their identity was by joining Barça. It was less risky than joining a clandestine anti-Franco movement, and allowed them to express their dissidence. During Franco's regime, however, the blaugrana team was granted profit due to its good relationship with the dictator at management level, even giving two awards to him.
How did the Catalans show their identity during the dictatorships?
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Answer: joining Barça


Problem: On 14 October, the heaviest night attack to date saw 380 German bombers from Luftflotte 3 hit London. Around 200 people were killed and another 2,000 injured. British anti-aircraft defences (General Frederick Alfred Pile) fired 8,326 rounds and shot down only two bombers. On 15 October, the bombers returned and about 900 fires were started by the mix of 415 short tons (376 t) of high explosive and 11 short tons (10.0 t) of incendiaries dropped. Five main rail lines were cut in London and rolling stock damaged.
How many German bombers were shot down?
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Answer:
two