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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 :
Statement I The product of coefficient of correlation, standard deviation of variable 'X' and Standard deviation of variable 'Y' gives the measure of covariance between X and Y variables.
Statement II The product of coefficient of correlation between X and Y variables and the ratio between standard deviation of X variable to standard deviation of Y variable measures the slope of the regression line of X on Y variable.
Given below are six sentences, four of which (P,Q,R,S) are jumbled. Pick the option that gives the correct order of P,Q,R,S S-1 A summary is a short, yet coherent version of a text P - In formal settings, since no one has the time to go through the minute details of each and every document, the summary helps in keeping track of whatever is essential in an official environment. Q - A summary is especially useful in formal settings, such as classroom lectures, business documents, speeches and reports. R - It gives a ready reference to the users to understand the main ideas or highlights of a text and it saves time. S - On the whole, it has two major benefits. S-6 The person who writes a summary, therefore, has the great responsibility of taking down only those points which are of utmost importance.
The “IPX delay number” command will allow an administrator to change the default settings. What are the default settings?
Read the paragraph and answer the question that follows: An environment is the natural surroundings which help life to grow, nourish and destroy on this planet called earth. Natural environment plays a great role in the existence of life on earth and it helps human beings, animals and other living things to grow and develop naturally. But due to some bad and selfish activities of human beings, our environment is getting affected. It is the most important topic that everyone must know how to protect our environment to keep it safe forever as well as ensure nature’s balance on this planet to continue the existence of life. It is important to protect the environment to ensure –
Read the paragraph and answer the question that follows: An environment is the natural surroundings which help life to grow, nourish and destroy on this planet called earth. Natural environment plays a great role in the existence of life on earth and it helps human beings, animals and other living things to grow and develop naturally. But due to some bad and selfish activities of human beings, our environment is getting affected. It is the most important topic that everyone must know how to protect our environment to keep it safe forever as well as ensure nature’s balance on this planet to continue the existence of life. What affects the environment badly?
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.
You are the administrator of contoso.local domain. You organize the domain into organizational units as shown in the EXHIBIT. You configure the local security options and other settings for the default domain policy object You delegate administration of Michigan and Florida OU. You want to prevent those administrators from creating any other group policy objects with settings that conflict with those you configured.What should you do?
Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. Many farmers use synthetic pesticides to kill infesting insects. The consumption of pesticides in some of the developed countries is touching 3000 grams/hectare. Unfortunately, there are reports that these compounds possess inherent toxicities that endanger the health of the farm operators, consumers and the environment. Synthetic pesticides are generally persistent in environment. Entering in food chain they destroy the microbial diversity and cause ecological imbalance. Their indiscriminate use has resulted in development of resistance among insects to insecticides, upsetting of balance in nature and resources of treated populations. Natural pest control using the botanical pesticides is safer to the user and the environment because they break down into harmless compounds within hours or days in the presence of sunlight. Plants with pesticidal properties have been in nature for millions of years without any ill or adverse effects on the ecosystem. They are easily decomposed by many microbes common in most soils. They help in the maintenance of biological diversity of predators and human health hazards. Botanical pesticides formulated from plants are biodegradable and their use in crop protection is a practical sustainable alternative. Which of the following statements is/are correct regarding biopesticides? 1. They are not hazardous to human health. 2. They are persistent in environment. 3. They are essential to maintain the biodiversity of any ecosystem. Select the correct answer using the code given below.
Read the following sentences and choose the correct option. (i) Variables can only take discrete values while Attributes can take continuous values. (ii) Variables can only take continuous values while Attributes take discrete value. (iii) Attributes and variables are dependent on each other. (iv) Width of an impeller blade is a variable but no. of defective blades in a lot is an attribute.