BARC EE Quiz - 11

An LTI system has step response (1 – e^–t) u(t). The response for the following input, x(t) at t = 2 is

For High head and low discharge the water turbine used is

Single-phase current source inverter is connected with capacitive load only the waveform of the output voltage across the capacitor for constant source current will be,

The output of a linear system for a ramp input is t²e^–t, the transfer function is

In the circuit shown in the figure below, switch 'S' is closed at t = 0. Which one of the following gives expression for the voltage across the inductance as a function of time?

In the Below system, the magnitude of the fault current (in p.u.) supplied by generator G₁, if a 3-ϕ fault occurs at 11 KV bus bar. Consider the system is under No-load condition and the Base MVA is 15MVA.

G₁: 10 MVA, 11KV, X_d^’’ = 12 %

G₂: 15 MVA, 11KV, X_d^’’ = 10 %

T₁: 8 MVA, 11 KV/66 KV, X = 8 %

T₂: 10MVA, 66KV/11 KV, X = 10 %

A 230 V DC shunt motor has an armature circuit resistance of 0.4 Ω and field resistance of 115 Ω. This motor drives a constant torque load and takes an armature current of 20A at 800 RPM. If motor speed is to be raised from 800 RPM to 1000 RPM, find the resistance that must be inserted in the field circuit. Assume magnetization curve to be a straight line.

For phase-controlled converter shown in figure below, the peak instantaneous output voltage is 200 V. Its firing angle is ________degrees if Thyristor is fired in every positive half cycle.

A unity feedback closed loop system has the loop transfer function G(s) =. The system becomes stable for the range.

For the bridge circuit shown in below figure find the value of  R and C in a condition when bridge is balanced.

Consider 

C₂ = 0.05 μf, R₃ = 20 kΩ

C₄ = 300 pf, R₄ = 1.2 kΩ