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BARC EE-2018: Mini Mock 1

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Question 1

A 3ϕ, 3300 V, Y connected synchronous motor has an effective resistance and synchronous reactance of 2 Ω and 18 Ω per phase respectively. If the open circuit generated emf is 2195 V per phase, the maximum power developed by motor is _________ kW.

Question 2

An op amp has open loop band width of 5Hz at gain 2 X 10⁵. Feedback is incorporated and resistors R1 and R2 form the feedback network. Find the bandwidth of the amplifier shown in fig.

Question 3

The circuit shown is meant to supply a resistive load RL from two separate DC voltage sources. The switches S1 and S2 are controlled so that only one of them is ON at any instant. S1 is turned on for 0.2 ms and S2 is turned on for 0.3 ms in a 0.5 ms switching cycle time period. Assuming continuous conduction of the inductor current and negligible ripple on the capacitor voltage, the output voltage V₀ (in Volt) across RL is ______________.

Question 4

In the circuit shown below the upper cutoff frequency of the circuit is

Question 5

The power input to the rotor of a 3-phase, 60 Hz, 4 Pole induction motor is 50 kW. The rotor emf makes 150 complete alternations per minute. Find the mechanical power developed by the motor.

Question 6

Find the value of R to design a RC phase shift oscillator to sustain oscillations of f_o = 10 KHz and put C= 1nF?

Question 7

A 220 V shunt motor has an armature resistance of 0.5 Ω and takes a current of 40 A on full load. How much must the main flux be reduced to raise the speed by 50%, if the developed torque is constant?

Question 8

A thyristor has thermal capacity of 0.1 J/ °C and a thermal resistance of 0.9 °C/W. The permissible short-time power loss for the temperature rise of 40 ° C over 0.01 sec is _______ W.

Question 9

Consider an NMOS whose threshold voltage is V_T, doping concentration of substrate is N_A cm^–3, thickness of oxide is to x, charge stored in oxide due to impurities is Q_ss cm^–3. Consider the following statements
1) Value of V_T increases with increase in t_o_x
2) Value of V_T increases with increase in Q_ss
3) Value of V_T increase with increase in N_a
4) Value of V_T do not depend on t_o_x
Which of the above statement are true

Question 10

Consider the system shown below:

D is a delay block of 1 unit. What is the impulse response of the cascaded system?

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ESE & GATE EE General

Feb 26ESE & GATE EE