ESE EE 2021 Technical Quiz 12

Statement 1: Bridge rectifies is preferred over centre tap rectifier.

Statement 2: Bridge rectifiers have less peak inverse voltage and requires a smaller transformer

A superhetrodyne receiver is to operate in 450kHz – 1550kHz, with intermediate frequency 450 kHz. The value of  is

The root locus of a unity feedback system,  will intersect jω axis at s = ±j√α. The value of α is

In the circuit shown, the function implemented is:

Calculate actual transformation ratio of a single turns. The magnetizing and core-loss currents are 40 A and 30 A respectively. Assume secondary current is 5 A and δ = 23.13° lag.

Consider a RL load having large inductor value that is feeded by semi-converter bridge circuit (3-phase). If load current is 10 A, then r.m.s. value of source current for firing angle of 90° is

Statement I: The per unit impedance of transformer is same whether calculated from referred to high voltage side or low voltage side.

Statement II: The base value of voltages used for calculating per unit impedance are in the ratio of turns ratio of transformers for low voltage and high voltage sides.

Consider the input-output relationship

y(t) = t²×(t – 1)

Which of the following statements are correct?

For induction motor, consider the following:

(i) At 30% tapping auto-transformer starter, starting torque = 100 Nm

(ii) At 40% tapping auto-transformer starter, starting torque = ‘T’ Nm

The value of ‘T’ is ____________.

The value of ‘k’, for which  represents magnetic field is: