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Following statements are given for DC motors (a) DC motors require less maintenance than AC motors (b) DC motors cannot provide high starting torque (c) DC motors are not suitable for very high-speed applications (d) The methods of speed control of DC motors are simpler and less expensive than those of AC motors Which of the following statements are correct?
Consider the following statements regarding ac drives: 1. For the same kW rating, ac motors are 20% to 40% light weight as compared to dc motors. 2. The ac motors are more expensive as compared to same kW rating dc motors. 3. The ac motors have low maintenance as compared to dc motors. Which of the above statements are correct?
In which of the following cases is frequent starting and stopping of electric motors needed?
Which of the following statements are correct for synchronous motors? 1. Synchronous motors are well-suited for direct connection top reciprocating compressors. 2. Over-excited synchronous motors are most commonly used for power factor improvement. 3. Synchronous motors are generally used for current regulation of long transmission lines Select the correct answer using the code given below.
In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. Photography is the _____________ we can get to stopping time. The camera is our pause button, the cork we use to stop time from running out. And the photo album is the most potent time machine ever ____________, one that transports you to a curated past where everything exists ________ you choose to remember it,one that lets you revisit ________ just people and places and ages, but the hidden crannies of ________ own memory and the strange landscape of emotions that lies beyond. Photography is the _____________ we can get to stopping time.
Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control
Ward Leonard method is an ideal choice for motor which undergoes frequent starting, stopping, speed reversal.
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: An induction motor can, therefore, be made without electrical connections to the rotor. B: Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. C: An induction motor's rotor can be either wound type or squirrel-cage type. D: An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.
Two statements are given, followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly know facts, decide which of the conclusions logically follow(s) from the statements. Statements: All wires are motors. All motors are pumps. Conclusions: i. All wires are pumps. ii. Some motors are wires.
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: A moment of silence, please, for the world’s cheapest car, which had all but has died in India. It was almost 10 years old. The Nano’s death was confirmed by production numbers: Tata Motors Ltd. produced 1 unit in June, down from 275 in the same month last year. Exports were zero, versus 25 in June 2017. The company acknowledged that the car in its ‘present form cannot continue beyond 2019’. Why? Arguments: I. The expiry of the ‘people’s car’, as Tata Motors branded it in 2008, holds lessons for automakers hoping to make it in India: While consumers may be value-conscious, cutting costs to the bone in pursuit of a gimmicky claim to fame is of no use if the end result is a second-rate vehicle with a tendency to catch fire.  II. The Nano’s failure to sell stands is in stark contrast to the rest of the Indian car market. From motorbikes to cars and trucks, growth in every segment is picking up.  III. This is a market where electric vehicles are non-existent and the chatter over fancy ideas such as future mobility and autonomous vehicles, which pervades the rest of the auto world, is muted.