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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.
Generally, TCP is reliable and UDP is not reliable. DNS which has to be reliable uses UDP because
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.
Which of the following features is/are relevant to variable reluctance stepper motors? 1. Smaller rotor mass; more responsive 2. Step size is small 3. More sluggish 
Which of the following is NOT a valid advantage of hybrid stepper motors?
Which of the following is an application of stepper motors?
Which type of stepper motors have low cost and low-resolution motor?
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 thefour alternatives. This argument is completely ______________ and shows very little understanding ____________ education. The costs quoted for privateschools, one, have no reliable source of data and, ______________, they discount two kinds of hidden costs — to the family and _____________ the nation. Often the cost of education in private schools is _________________ with the fee per child. one, have no reliable source of data and, ______________, they discount two kinds of hidden costs