Synopsis of Electrical Engineering

1. Symbols for units are written without capital letters, except when it is derived from name. Example: "t" for time "h" for hour "m" for meter 2. Symbols for units derived from proper name are written in capital. Example: "A" for ampere "W" for watt 3.Full names of units are written with lower case letters only. Example: newton henry 4. A space is left between symbols of compound units. Example: N m 5. A space is left between the number and symbol. Example: 56 J 5 A 6. Only one SI prefix is permitted. Example: kA MJ 7. A symbol should not be followed by a fullstop except when it is a product. Example: kg.m 8. Numerals with more than three digits shall be written without commas and with a narrow spacing at an interval of three digits. Example: 45 006 72 674 9. A number with four figures is not broken as mentioned above. Example: 4321 10. A symbol of a unit is placed after the decimal

1. In which year, the SI (System International d`units) was recommended by the general conference on weights and measures? a) 1966 b) 1959 c) 1960 d) 1961 Ans: c 2. What is the SI Unit of Length? a) second b) gram c) mole d) meter Ans: d 3. What is the SI Unit of Mass? a) mole b) kilogram c) second d) ampere Ans: b 4. What is the unit of Electric current? a) ampere b) Kelvin c) candela d) radian Ans: a 5. Candela is the unit for which quantity? a) Temparature b) Plane angle c) Solid angle d) Luminous Intensity Ans: d 6. Among the following, which one is the supplemantary unit? a) steradian b) mole c) second d) meter Ans: a 7. What is the unit of Solid angle? a) candela b) ammeter c) Kelvin d) steradian Ans: d 8. What is the unit for derived quantity, Area? a) cubic meter b) meter per second c) square meter d) mole per cubic meter Ans: c 9. What is the unit of derived quantity, Luminance (Light)? a) candela per square met