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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
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: In the first, NHRC, submitted a mid-term report to the United Nations on the human rights situation in the country, highlighting the government’s policies on climate change, rights of women, children, disabled, and the elderly, and the right to food, work and health. B: India is considering a universal basic income and will not consider a repeal of the Armed Forces (Special Powers ) Act or a moratorium on the death penalty, the National Human Rights Commission (NHRC) has told the United Nations. C: The government has focused cash transfer schemes aimed at farmers, especially, but no universal cash transfer programme. D: In the report, Universal Periodic Review (UPR)-III, the UN has been informed that the Indian government is examining and “actively considering” the possibility of a universal basic income to reduce poverty. Universal basic income (UBI) refers to periodic cash transfers to every citizen.
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.
Which of the following statements are correct for dc shunt motor? 1. Speed of a shunt motor is sufficiently constant 2. For the same current input, its starting torque is not high as that of series motor 3. The motor can be directly coupled to a load such as fan whose torque increases with speed Select the correct answer using the code given below.
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 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque is twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. An external resistance is now tripled in the rotor circuit. Then the slip at which maximum torque occur for the same load torque is?
For a three phase induction motor, maximum torque is double the full load torque and starting torque is 1.6 times the full load torque. To get a full load slip of 5%, percentage reduction in the rotor resistance should be?
Consider the following statements. It converts the positive half cycle of the sinusoidal wave of the input to the pulsating DC output signal. It converts the positive half as well as negative half cycle of the sinusoidal wave of the input to pulsating DC output signal. Which of the following statements is CORRECT about half-wave rectifier?
The torque-speed characteristics of motor (TM) and load (TL) for two cases are shown in the figure (a) and (b). The load torque is equal to motor torque at points P, Q, R and S The stable operating points are
Consider the following statements regarding a stepper motor: 1. The rotation angle of the motor is proportional to the input pulse. 2. The motor has full torque at standstill. 3. Speed and electric control signal of the motor vary mutually linearly. Which of the above statements are correct?