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Below stated are some of the statements about the Alternating current. You need to identify which of the following is incorrect, 1. DC power is far more powerful than AC power. The efficiency and power to size characteristics of DC motors and apparatuses are increased. Lighting by DC (LED) is 75% more efficient than lighting from incandescence. 2. A comparatively high voltage alternating current may be generated and easily raised and dropped by the static equipment known as the transformer, which makes electrical energy transmission and distribution economical, 3. Initial costs and maintenance of the AC motor are less expensive since it has no switch and is less powerful than the DC motor for constant working speed, hence it is desired to create power as alternating current. 4. The great efficiency of transmission in ac makes electric power generation cost-effective, Produced in huge quantities in one station and distributed throughout a vast area.
Consider the following statements for superconductivity: 1. Superconducting magnets capable of generating high fields with low power consumption are currently being employed in scientific test and research equipment. 2. One of the potential applications of superconducting materials is electrical power transmission through superconducting materials - power losses would be extremely low, and the equipment would operate at low voltage level. 3. Type II superconductors are preferred over type I for most practical applications by virtue of their higher critical temperatures and critical magnetic fields. Which of the above statements is/are correct?
Which of the following has to be considered for overhead/underground electrical power transmission / distribution system? a) The voltage at the consumer’s premises must be maintained within ± 4 or ± 6% of the declared voltage. b) The transmission cost should be unduly excessive. c) The insulation resistance of the whole system should be very high d) The loss of power in the system itself should be a small percentage (about 10%) of the power transmitted.
Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy
For transmission and distribution of electrical power, which one of the following materials is NOT used?
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Transformers can also be used for isolation, where the voltage in equals the voltage out, with separate coils not electrically bonded to one another. B: Transformers are most commonly used for increasing low AC voltages at high current (a step-up transformer) or decreasing high AC voltages at low current (a step-down transformer) in electric power applications. C: It was discovered in 1831. D: A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another.
Consider the following statements: 1. Both ferromagnetic and ferrimagnetic materials have domain structures; each domain has randomly oriented magnetic moments when no external field is applied. 2. Both ferromagnetic and ferrimagnetic materials make those domains that have a favourable orientation to the applied field grow in size. 3. The net magnetic moment in ferromagnetic materials is higher than that in ferrimagnetic materials. 4. The net magnetic moment in ferrimagnetic materials is higher than that in ferromagnetic material. Which of the above statements are correct?
The underground transmission and distribution of power is better than the corresponding overhead transmission and distribution in respect of _________
Power transmission & retail distribution major Adani Transmission Limited has signed definitive agreements with which of the following for the acquisition of Warora-Kurnool Transmission Limited (WKTL)?
What does hydropower change A. Kinetic energy to electrical energy B. Mechanical energy from electrical energy C. Chemical energy to electrical energy D. Wind energy to electrical energy