A factory space 33 m x 13 m is to be illuminated with an average illumination of 72 lux by 200 W lamps. CU = 0.40, MF = 0.71. If the lumen output of a 200 W is 2,730 lumens, calculate the number of lamps required
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A factory space 33 m x 13 m is to be illuminated with an average illumination of 72 lux by 200 W lamps. CU = 0.40, MF = 0.71. If the lumen output of a 200 W is 2,730 lumens, calculate the number of lamps required. Show detailed solution. No solution. No points.
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- D3 D1 V1 sine R1 1 kHz D2 D4 Given: • V1 = 5.9 Vrms • R1 = 7 kOhm • Diode voltage = 0.9 V What is the maximum voltage across resistor R1 (in V)?docs.google.com 8 1. What are the values of the resistances bellow according to these colors? a. Orange – blue - green - gold b. Violet – yellow – violet – silver c. Yellow – gray - green - orange - gold d. Blue - brown- red- orange - gold – red 1 Add file 2. How can you connect Avometer to measure current, voltage and resistance? * Your answer 3- how can you examine the capacitor and diode if they work or not ? *Q.1. A diode network is given in Figure-1. a) Explain the tasks of the diodes (parallel and serial) and resistor in the network b) Calculate I and V. c (mA) 30 μΑ +20 V 25 µA Si 5 20 μΑ 4 A Ge 15 μΑ Si 3 10 µA 2 B 5 µA Ig = 0 µA 2.2 k2 10 15 20 VCE 4V Figure-1 Figure-2
- A school classroom having a general dimension of 24 ft x 30 ft is to be lighted at an average footcandle of 50. How many 4-lamp fixtures with an output per lamp of 3,200 lumens are required? Assume CU = 0.36 and MF = 0.70. Show detailed solution. No solution. No points.A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under standard conditions. The maximum possible percentage error in the reading is ?The lumen rating of a 60W Incandescent lamp is 4200,lts Efficacy will be O a. 30% O b. 70% O c. 60% O d. 100%
- In order to identify the function of the parts of an electronic system, the Blank 1 diagram system representation is used. Blank 1 Add your answer A Si diode has a leakage current Is = 40 nA at room temperature (25°). The leakage current if the temperature increases to 43 °C is nA. No need for a solution. Just write your numeric answer in the space provided. Round off your answer to 2 decimal places. Add your answer Short answer. In testing a diode, if the red probe of an analog ohmmeter is tapped at the anode while the black probe is at the cathode, what is the ohmmeter reading if the diode is in good condition? Use the editor to format your answerA Multimeter is used to measure a) Only AC current b) Only DC voltage c) Both AC and DC quantities d) Resistance only Select one: O a.b Ob.c O c. a O d. dDraw a figure and show the complete solution.
- 13. Mark positive and negative plate first then Draw the electric field and electric potential lines on the given grids. 152) a. what is the electric field at 8 volt between 2 volt b. what is the potential difference on 6volt (Take the reference point as 0 volt) 12 Volts 0 Volts -10 V -8 V -6 V -4 V -2 VFigure 1 Figure 2 shows a multi-range scale that is used to measure small currents. When the approximate value of current is not known, it is customary to set the selector switch to the highest value initially and then switch down the ranges until a readable deflection in the upper part of the scale is obtained. 10 15 4 40 50 30 20 10 Suppose the selector is at the 10 mA position and the actual current being measured is 10 milli- amperes, the pointer should move across the scale and align itself with the right-hand edge of the 0-10 scale. (The selector switch position corresponds with the full scale value, and the appropriate scale is used). For example, with the selector switch at 10 mA and the pointer as shown in Figure 2, the current is 8.3 mA. mA, Selector Switch 1 0mA 25MA 50mA Now estimate the current when the selector switch is: Figure 2 (a) at 25mA Answer mA (b) at 50mA AnswerIn the figure below you see the sketches for the front and back of an electrical circuit board. The board is cut into a trapezoidal shape and is made of plastic. On the back of the board there is conductive paint shown here in green. On the front there are some resistors and capacitors, in addition to terminals for inserting the leads from a DC power supply. The legs of the resistors and capacitors go through the holes on the board and are soldered to the conducting paint on the back side. You also have a multi-meter which you can use as an ammeter or a voltmeter. 16 v 4700 16 10 8 O- 7 3. 6. 4 O+