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BARC-2018 EE: Mini Mock 5

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Question 1

A 450 kVA transformer has an efficiency of 94% at full-load and 94.5% at ¾th of full load. Determine the efficiency of the transformer at 0.6 full load.

Question 2

In a diode circuit, find the value of V_D if voltage across diode is 0.7V at 1 mA dc, where n = 2.

Question 3

Consider a lossless transmissions line which is connected as shown in the figure

The average power dissipated in 25

load is__________ Watts.

Question 4

A thyristor has a latching current of 20mA. It is connected in a half-wave controlled rectifier circuit, between a 100V, 60Hz a.c. supply and an inductive load of 10Ω resistance and 20Ω inductive reactance. Determine the minimum pulse width required to obtain latching current when the firing angle delay α is 60^o.

Question 5

A closed loop unity feedback system described by the transfer function

If system is subjected to a unit ramp input, the steady state error is ________.

Question 6

For a single circuit transmission line delivering a load of 50 MVA at 110 KV and pf 0.8 lagging.
Given

and

The sending end line voltage is ______kV.

Question 7

Consider the logical circuit given below

Initially the counter contain ‘010’ then after 9 clock pulses which of the following is true

Question 8

A single phase 60 Hz generator supplies an inductive load of 2000kW at a power factor of 0.404 lagging by means of an overhead transmission line 30 km long. The line resistance and inductance are 0.0122 ohm and 0.35 mH per km. The voltage at the receiving end is required to be kept constant at 8 kV. Find the sending end voltage and voltage regulation of the line.