World Science and Technology – Exercise – 1

16. Which motor is NOT suitable for use as a DC machine?

(a) Permanent magnet motor
(b) Series motor
(c) Squirrel cage motor
(d) Synchronous motor

Answer
Answer : (c)
Explanation
Explanation : The squirrel cage motor is the only one without any connection to the armature. Let us discuss.
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17. Compact discs, (according to the original CD specifications) hold how many minutes of music?

(a) 74 mins
(b) 56 mins
(c) 60 mins
(d) 90 mins

Answer
Answer : (a)
Explanation
Explanation : According to many stories surrounding the origin of the compact disc, 74 minutes was settled on because it would comfortably contain all of Beethoven’s 9th symphony on one disc. Although some stories reference a specific Sony higher-up who claimed this as his favorite piece of music, stories differ. All that’s known for sure is that Sony insisted on this and won out over Phillips’ original 60 minute proposal. Let us discuss.
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18. What does AC and DC stand for in the electrical field?

(a) Alternating Current and Direct Current
(b) A Rock Band from Australia
(c) Average Current and Discharged Capacitor
(d) Atlantic City and District of Columbia

Answer
Answer : (a)
Explanation
Explanation : Electricity is voltage and current. Voltage is electrical pressure, and current is the flow of charged particles. The difference between alternating current (AC) and direct current (DC) is that the electrons in an AC circuit regularly reverse their direction. In a DC circuit electrons always flow in the same direction. Let us discuss.
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19. Sometimes computers and cache registers in a foodmart are connected to a UPS system. What does UPS mean?

(a) United Parcel Service
(b) Uniform Product Support
(c) Under Paneling Storage
(d) Uninterruptable Power Supply

Answer
Answer : (d)
Explanation
Explanation : An uninterruptable power supply (UPS) is a backup power supply, such as a battery, that provides emergency power in the event that power is lost from the main supply. Let us discuss.
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20. Which consists of two plates separated by a dielectric and can store a charge?

(a) Inductor
(b) Capacitor
(c) Transistor
(d) Relay

Answer
Answer : (b)
Explanation
Explanation : Useful in tuning and filtering circuits, it blocks DC while passing AC. How much charge a capacitor can store is its capacitance, measured in farads.nn Let us discuss.
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