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Consider the following statements: In the above figure, the curves pertain to the DC motor A. Speed vs Armature current characteristic of a DC shunt motor B. Torque vs Armature current characteristic of a DC shunt motor C. Speed vs Armature current characteristic of a DC series motor D. Torque vs Armature current characteristic of a DC series motor
Assertion (A): Slotted armature type in this armature is placed in slotted armature with DC windings placed inside the slots. Reason (R): The construction is highly reliable and rugged but has high torque.
In an alternator, the armature winding is kept stationary while the field winding is kept rotating for the following reasons: 1. Armature handles very large current and high voltage 2. Armature fabrication, involving deep slots to accommodate large coils, is easy if armature is kept stationary 3. It is easier to cool the stator than the rotor Which of the above reasons are correct?
Study the following information carefully and answer the question based on it. Seven chairs - T, U, V, W, X, Y and Z are arranged in a row facing north. Chair U and W are placed adjacent to each other where W is placed on the left side of U. Neither chair T, U, W nor X are placed at the extreme ends. Chair V is placed third to the right of chair U. Chair X is placed between chair W and Y but chair Y is not placed adjacent to chair U. Chair Z is placed forth to the right of chair X. Which of the following statement is true?
The stator of a split-phase induction motor has two windings, the main winding and the auxiliary winding. How are these windings displaced in space by electrical degrees?
In case of synchronous motor, which of the following are true? a. Synchronous motor is not self-starting b. If the rotor poles are excited by field current and the stator terminals are connected to AC supply, motor vibrates. c. Variable frequency supply is used to start synchronous motor. d. By using frequency converter, a synchronous motor can be brought from standstill to its desired speed.
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.
A 4-pole wave wound DC motor drawing an armature current of 20 A has provided with 360 armature conductors. If the flux per pole is 0.015 Wb then the torque developed by the armature of motor is _______
Study the following information carefully and answer the question based on it. Eight jugs - P, Q, R, S, T, U, V and W are placed in a row facing north. Jug T is placed third to the right of jug U which is placed at one of the extreme end. Jug S is placed somewhere to the right of jug T but not at the extreme end. Jug R is placed 2nd to the right of jug U. jug Q is placed between jug U and jug R. jug P is placed 4th to the right of jug Q and to the immediate right of jug P is jug V. Which of the following statement is true?
Five boxes B1, B2, B3, B4 and B5 are placed one above the other in racks. The lowermost rack is numbered as one and just above the lowermost is numbered as two and so on. Each box is coloured with different colour such as L1, L2, L3, L4 and L5 (not necessarily in the same order). Two boxes are placed between L2 coloured box and L5 coloured box. Box B1 is not placed immediately above box B3. Box B4 is placed in the top most rack. L1 coloured box is placed immediate above L5 coloured box. Box B3 is coloured with L4. L5 coloured box is placed above L4 coloured box. Box B2 is coloured with L1. Which of the following boxes are placed immediately above and immediately below B5 box respectively?