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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?
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.
The fractional horsepower motors have efficiency of order of 98%.
It is desired to freeze 10,000 loaves of bread each weighing 0.75 kg from an initial room temperature of 18°C to a final temperature of -18°C. The bread-freezing operation is to be carried out in an air-blast freezing tunnel. It is found that the fan motors are rated at a total of 80 horsepower and measurements suggest that they are operating at around 90% of their rating, under which conditions their manufacturer’s data claims a motor efficiency of 86%. If 1 ton of refrigeration is 3.52 kW, estimate the maximum refrigeration load imposed by this freezing installation assuming that fans and motors are all within the freezing tunnel insulation and the heat-loss rate from the tunnel to the ambient air has been found to be 6.3 kW. Extraction rate from freezing bread (maximum) = 104 kW
What is the property of material for the application of fractional-horsepower motor bearings?
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.
If WORK = 7935, ROCK = 3587 AND WART = 1945, which digit stands for T? A. Either 9 or 1 B. Either 8 or 1 C. Either 4 or 5 D. Either 1 or 4
What is the formula for collection efficiency in terms of fractional efficiency? Where ηi is fractional efficiency, M is the total amount entering collector, and mi is the fraction collected in the given range.
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.