Electrical Engineering GATE 2023 Questions with Answer

Ques 40 Microprocessors

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In a given 8-bit general purpose micro-controller there are following flags. W C-Carry, A-Auxiliary Carry, O-Overflow flag, P-Parity (0 for even, 1 for odd) R₀ and R₁ are the two general purpose registers of the micro-controller. After execution of the following instructions, the decimal equivalent of the binary sequence of the flag pattern [CAOP] will be _______.
MOV R₀, +0x60
MOV R₁, +0x46
ADD R₀, R₁

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Ques 41 Networks

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The value of parameters of the circuit shown in the figure are
R₁=2 Ω, R₂=2 Ω, R₃=3 Ω, L=10 mH, C=100 μF.
For time t<0, the circuit is at steady state with the switch 'K' in closed condition. If the switch is opened at t=0, the value of the voltage across the inductor (V_L) at t=0⁺ in Volts is _______. (Round off to 1 decimal place).

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Ques 42 Networks

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For the circuit shown in the figure, V₁=8 V, DC and I₁=8 A, DC. The voltage V_ab in Volts is _______. (Round off to 1 decimal place).

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Ques 43 Networks

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For the circuit shown, if i=sin1000t, the instantaneous value of the Thevenin's equivalent voltage (in Volts) across the terminals a-b at time t=5 ms is _______. (Round off to 2 decimal places).

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Ques 44 Networks

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The admittance parameters of the passive resistive two-port network shown in the figure are
y₁₁=5 S, y₂₂=1 S, and y₁₂=y₂₁=-2.5 S.
The power delivered to the load resistor R_L in Watt is _______. (Round off to 2 decimal places).

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Ques 45 Networks

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The circuit shown in the figure is initially in the steady state with the switch K in open condition and K̅ in closed condition. The switch K is closed and K̅ is opened simultaneously at the instant t=t₁, where t₁>0. The minimum value of t₁ in milliseconds, such that there is no transient in the voltage across the 100 μF capacitor, is _______. (Round off to 2 decimal places).

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Ques 46 Power Electronics

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The chopper circuit shown in figure (i) feeds power to a 5 A DC constant current source. The switching frequency of the chopper is 100 kHz. All the components can be assumed to be ideal. The gate signals of switches S₁ and S₂ are shown in figure (ii). Average voltage across the 5 A current source is _______.

A

10 V

B

6 V

C

12 V

D

20 V

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Ques 47 Power Electronics

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A semiconductor switch needs to block voltage V of only one polarity (V>0) during OFF state as shown in figure (i) and carry current in both directions during ON state as shown in figure (ii). Which of the following switch combination(s) will realize the same?

A

B

C

D

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Ques 48 Power Electronics

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The circuit shown in the figure has reached steady state with thyristor 'T' in OFF condition. Assume that the latching and holding currents of the thyristor are zero. The thyristor is turned ON at t=0 sec. The duration in microseconds for which the thyristor would conduct, before it turns off, is _______. (Round off to 2 decimal places).

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Ques 49 Power Electronics

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The single-phase rectifier consisting of three thyristors T₁, T₂, T₃ and a diode D₁ feed power to a 10 A constant current load. T₁ and T₃ are fired at α=60° and T₂ is fired at α=240°. The reference for α is the positive zero crossing of V_in. The average voltage V_o across the load in volts is _______. (Round off to 2 decimal places).

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Ques 50 Power Systems

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For the three-bus power system shown in the figure, the trip signals to the circuit breakers B₁ to B₉ are provided by overcurrent relays R₁ to R₉, respectively, some of which have directional properties also. The necessary condition for the system to be protected for short circuit fault at any part of the system between bus 1 and the R-L loads with isolation of minimum portion of the network using minimum number of directional relays is _______.

A

R₃ and R₄ are directional overcurrent relays blocking faults towards bus 2.

B

R₃ and R₄ are directional overcurrent relays blocking faults towards bus 2 and R₇ is directional overcurrent relay blocking faults towards bus 3.

C

R₃ and R₄ are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively, R₇ is directional overcurrent relay blocking faults towards Line 3 and R₅ is directional overcurrent relay blocking faults towards bus 2.

D

R₃ and R₄ are directional overcurrent relays blocking faults towards Line 1 and Line 2, respectively.

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Ques 51 Power Systems

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The expressions of fuel cost of two thermal generating units as a function of the respective power generation

where a is a constant. For a given value of a, optimal dispatch requires the total load of 290 MW to be shared as P_G1=175 MW and P_G2=115 MW. With the load remaining unchanged, the value of a is increased by 10% and optimal dispatch is carried out. The changes in P_G1 and the total cost of generation, F(=F₁+F₂) in Rs/hour will be as follows _______.

A

P_G1 will decrease and F will increase.

B

Both P_G1 and F will increase.

C

P_G1 will increase and F will decrease.

D

Both P_G1 and F will decrease.

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Ques 52 Power Systems

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The bus admittance (Y_bus) matrix of a 3-bus power system is given below.

Considering that there is no shunt inductor connected to any of the buses, which of the following can NOT be true?

A

Line charging capacitor of finite value is present in all three lines.

B

Line charging capacitor of finite value is present in line 2-3 only.

C

Line charging capacitor of finite value is present in line 2-3 only and shunt capacitor of finite value is present in bus 1 only.

D

Line charging capacitor of finite value is present in line 2-3 only and shunt capacitor of finite value is present in bus 3 only.

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