In SMT (Surface Mount Technology) production, inspection is a critical part of the entire process. From solder paste printing to component placement and reflow soldering, even a small mistake can cause PCB failure, rework, or in some cases, entire batches to be scrapped. Among the many inspection methods available, AOI (Automated Optical Inspection) has become […]
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Metal casting is a cornerstone of modern industry, but traditional melting methods often face challenges with efficiency and environmental impact. So, how can manufacturers achieve a cleaner, more precise melting process? The answer lies in modern induction melting technology. This method uses electromagnetic principles to heat metal directly, offering remarkable control and performance. In this
1. Which of the following is the disadvantage due to low power factor? (a) Poor voltage regulation (b) Increased transmission losses (c) High cost of equipment for a given load (d) All of the above 2. Which of the following is the disadvantage of static capacitor for power factor improvement? (a) Easily damaged by high
1. The secondary sources of energy are (a) Solar, wind and water (b) Coal, oil and uranium (c) Either (a) or (b) (d) Neither (a) or (b) 2. The draught which a chimney produces is called (a) Induced draught (b) Natural draught (c) Forced draught (d) Balanced draught 3. The draught in locomotive boilers is
1. By low voltage application, we can start a: (a) Schrage motor (b) Synchronous motor (c) Slip ring induction motor (d) DC compound motor [UPPCL (JE) – 2016] 2. The universal motor speed can be controlled by: (a) Centrifugal mechanism only (b) Resistance method only (c) Any one of the given three methods (d) Tapped
4 – 20 mA Signal Transmission There are a wide variety of sensors available to provide us with electrical signals representing many different parameters which we wish to measure. All these devices have different characteristics of signal type, amplitude and linearity. To make use of them in an industrial environment it is useful to convert
Construction and Working of Light Emitting Diode A PN junction diode, which emits light when forward biased, is known as a light emitting diode (abbreviated as LED). The emitted light may be visible or invisible. The amount of light output is directly proportional to the forward current. Thus, higher the forward current, higher is the
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LCD Construction and Working A liquid crystal is a material (usually, an organic compound) which flows like a liquid at room temperature but whose molecular structure has some properties normally associated with solids. As is well-known, the molecules in ordinary liquids have random orientation but in a liquid crystal they are oriented in a definite
Segment Displays A segment display is a form of electronic display device for displaying alphanumeric character decimal numerals that is an alternative to the more complex dot-matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information. In seven segments display, as its name indicates, is
1. The normal 3-phase slip-ring induction motor, the developed starting torque will (a) Increase with the increase in the value of the rotor resistance. (b) Decrease with the increase in the value of rotor resistance. (c) Not depend upon the value of the rotor resistance. (d) Increase with increase in the value of the rotor