The device used to change the speed of an electric fan is
1). Amplifier
2). Regulator
3). Switch
4). Rectifier
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1. Which of the following have the same unit ?
2. The reflector of a search light is a :
3. The instrument that measures and records the relative humidity of air is
4. Among the following materials sound travels fastest in
5. Which of the following instrument is used to measure Soil Water Tension?
7. What should a person on a freely rotating turn table do to decrease his (angular) speed ?
8. Which of the following is a compound machine?
9. Light from the Sun reaches us in nearly
10. A motor converts