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In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :
Consider the following statements regarding SMOG: 1. SMOG was coined during the 1950's to describe a mixture of smoke and fog experienced in London 2. The principal pollutants in London SMOG are particulates and sulphur compounds  3. The London SMOG occurs generally early in the morning on cold wet winter days  Which of the above statements are correct?
In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement All fog is smoke. No smog is fog. Conclusion Some fog is smog. Some smog is fog.
Assertion (A): DC servomotors are more commonly used in armature controlled mode than field controlled mode. Reason (R): Armature controlled Dc motors have higher starting torque than fiels controlled motors.
The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options.  P: Delhi’s air quality deteriorates with unfailing regularity, with large swathes of north India in the grip of suffocating smog, but the State governments that can make it easier for millions to breathe do not act with any sense of urgency.  Q: The smog that envelops the region is exacerbated by the burning of biomass in Punjab and Haryana, and the winter atmosphere is marked by weak ventilation.  R: It is unconscionable for governments, through indifference and inaction, to subject citizens to such toxic air, and cause extreme suffering especially among people with respiratory ailments and impaired lung function.  S: It has turned into a public health emergency in the capital, with the air quality index touching extremely hazardous levels in some parts, necessitating the closure of primary schools, has further lowered its standing.
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
Arvind Kejriwal inaugurated a truck-mounted anti-smog gun to combat the worsening dust pollution in the national capital. The anti-smog gun is fed by a water tank of hoe many litres?
Assertion (A): Photochemical smog occurs during the sunny day. Reason (R): When ultraviolet from the sun reacts with nitrogen oxides, NO2 goes through a complex series of reactions with hydrocarbons to produce components of photochemical smog. Select the correct response from the code given below:
Delhi CM Arvind Kejriwal will inaugurate the country's first smog tower in August 2021, at Baba Kharak Singh Marg, Connaught Place, Delhi. The smog tower will clean how many cubic metres of air every second?
An Op-Amp can be connected to provide 1. Voltage controlled current source 2. Current controlled voltage source 3. Current controlled current source Which of the above statements are correct?