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
1. A 3ɸ synchronous motors has been provided with damper winding. It can be started as a (a) Single phase synchronous motor. (b) 3ɸ squirrel cage induction motor. (c) 1ɸ induction motor. (d) 3ɸ alternator. [UPSSSC 2015] 2 Consider the following statements about a three-phase synchronous generator synchronized to an infinite bus when its mechanical
1. A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will (a) both decrease. (b) both increase. (c) increase and decrease respectively. (d) decrease and increase respectively. 2. A dc cumulatively compounded generator was operating satisfactorily and supplying power to
1. In a 3-phase power transformer, 5-limbed construction is adopted to (a) suppress the 5th and 7th harmonics. (b) suppress the 3rd and its multiple harmonics. (c) suppress all the orders of harmonics. (d) increase the capacity of the transformer. 2. Consider the following statements: The use of Delta-connected tertiary windings in star-star connected power