GATE EE format:nat PYQs & Answers — Page 6

Questions 51–60 of 256. Imported answers require independent review unless marked reviewed.

Topic practice 256 questionsPage 6 of 26

A difference amplifier is shown in the figure. Assume the op-amp to be ideal. The CMR (in dB) of the difference amplifier is ______ (rounded off to 2 decimal places).

Diagram for Electrical Engineering question 61

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A single-phase half-controlled bridge converter supplies an inductive load with ripple free load current. The triggering angle of the converter is 60°. The ratio of the rms value of the fundamental component of the input current to the rms value of the total input current of the bridge is ______ (rounded off to 3 decimal places).

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A single-phase full bridge voltage source inverter (VSI) feeds a purely inductive load. The inverter output voltage is a square wave in 180° conduction mode. The fundamental frequency of the output voltage is 50 Hz. If the DC input voltage of the inverter is 100 V and the value of the load inductance is 20 mH, the peak-to-peak load current in amperes is ______ (rounded off to the nearest integer).

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In the DC-DC converter shown in the figure, the current through the inductor is continuous. The switching frequency is 500 Hz. The voltage (

) across the load is assumed to be constant and ripple free. The peak inductor current in amperes is ______ (rounded off to the nearest integer).

Diagram for Electrical Engineering question 64

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A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications:

Specification	Value
Rated armature voltage	210 V
Rated armature current	10 A
Rated speed	1200 rpm
Armature resistance	1 Ω
Input to the converter bridge	240 V at 50 Hz
The armature of the DC motor is fed from the full-controlled bridge and the field current is kept constant.

Assume that the motor is running at 600 rpm and the armature terminals of the motor are suitably reversed for regenerative braking. If the armature current of the motor is to be maintained at the rated value, the triggering angle of the converter bridge in degrees should be ______ (rounded off to 2 decimal places).

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The value of parameters of the circuit shown in the figure are

For time

, the circuit is at steady state with the switch ‘K’ in closed condition. If the switch is opened at

, the value of the voltage across the inductor (

) at

in Volts is __________ (Round off to 1 decimal place).

Diagram for Electrical Engineering question 29

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A separately excited DC motor rated 400 V, 15 A, 1500 RPM drives a constant torque load at rated speed operating from 400 V DC supply drawing rated current. The armature resistance is 1.2 Ω. If the supply voltage drops by 10% with field current unaltered then the resultant speed of the motor in RPM is __________ (Round off to the nearest integer).

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For the signals

and

shown in the figure,

is maximum at

. Then

in seconds is __________ (Round off to the nearest integer).

Diagram for Electrical Engineering question 31

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For the circuit shown in the figure,

V, DC and

A, DC. The voltage

in Volts is __________ (Round off to 1 decimal place).

Diagram for Electrical Engineering question 32

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A 50 Hz, 275 kV line of length 400 km has the following parameters:

Resistance, R = 0.035 Ω/km; Inductance, L = 1 mH/km; Capacitance, C = 0.01 μF/km;

The line is represented by the nominal-π model. With the magnitudes of the sending end and the receiving end voltages of the line (denoted by

and

, respectively) maintained at 275 kV, the phase angle difference (

) between

and

required for maximum possible active power to be delivered to the receiving end, in degree is __________ (Round off to 2 decimal places).

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GATE EE format:nat PYQs

Question 61

Question 62

Question 63

Question 64

Question 65

Question 29

Question 30

Question 31

Question 32

Question 33