Related Questions

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?
Why is the air gap between stator and rotor should be kept as small as mechanically possible in induction motor?
The cages of five animals, Lion, Tiger, Elephant, Giraffe and Zebra were kept in a line one after the other, not necessarily in the same order. Lion’s cage is not kept at the last and giraffe’s cage is not kept at the first. Tiger’s cage was kept at the centre of the line. Zebra’s cage was kept after Lion’s but before Tiger’s cage. There was one cage kept between Tiger’s and Giraffe’s cage. Whose cage is kept at the last in the line?
Six boxes containing different items namely, Copy, Pen, pencil, Scissor, Tape and Paper, are kept in a straight line, one after the other, not necessarily in the same order. The box of Pen is kept at the third position in the line from the left end. The box of Paper is kept at the extreme right end. The box of Pencil is kept somewhere between box of pen and box of paper. The box of Tape is kept at the left of the box of Pen but at the right of the box of Copy, when counting from the left end. The box of scissor is not kept immediately next to Paper. Which box is kept at the second position from the right end?
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.
Eight articles A1, A2, A3, A4, A5, A6, A7 and A8 are kept one above the other, (not necessarily in the same order). Number of articles between A3 and A5 are two. A3 is kept below A5. A8 is just below A7. Only one article is kept between A6 and A1. A6 is kept above A1. A7 and A8 are between A3 and A5. Three articles are kept between A6 and A7. A7 is kept above A6. Which of the following statements is correct about A4?
Eight articles A1, A2, A3, A4, A5, A6, A7 and A8 are kept one above the other, (not necessarily in the same order). Number of articles between A3 and A5 are two. A3 is kept below A5. A8 is just below A7. Only one article is kept between A6 and A1. A6 is kept above A1. A7 and A8 are between A3 and A5. Three articles are kept between A6 and A7. A7 is kept above A6. Which of the following statement is correct about A4?
Seven books of different subjects are kept in a self in the following manner. A. There are two books between Hindi and English. B. Math book is kept just below Science book which is not kept immediately above and below English. C. Three books are placed between Science and Sanskrit. D. Neither Science nor Sanskrit book is kept immediately above or below Hindi. E. Not more than one book is kept between Social study book and Computer book. Which of the following book is kept at the middle of the self?
Some small cubes of same height 7 cm but variable length and width are put inside a large cuboid of height 21 cm. Length and width of cuboid is 32 cm and 24 cm, respectively. Small cubes are put such that cubes at the bottom most layer is of similar base area; second layer contains all the cubes of similar base area and third layer have all the cubes of similar base area. Which of the following statement(s) given below is / are TRUE? A: If side of each small cubes at bottom most layer is 8 cm, then maximum number of small cubes that can be put at bottom most layer is 12. B: If maximum of 48 cubes can be put at second layer, then side of each cube at second layer is 6 cm. C: If side of each small cubes at third layer is 1.6 cm, then maximum number of small cubes that can be put at third layer is 300.