UPSC ESE Prelims 2026 Electrical Engineering Question Paper (08-Feb-2026)

Question 1

Consider the following characteristics regarding ideal operational amplifier : 1. An infinite output impedance and zero input impedance 2. The Op-Amp must have an extremely high inherent voltage gain 3. Zero slew rate Which of the above characteristics is/are correct?

Accepted Answer

2 only

Answer

1 and 3

Answer

3 only

Answer

1 and 2

Question 2

An inverting amplifier using the $741C$ must have a flat response up to $40 kHz$. The gain of the amplifier is $10$. What maximum peak-to-peak input signal can be applied without distorting the output?

Accepted Answer

$0.398 V$

Answer

$3.98 V$

Answer

$30.98 V$

Answer

$0.0398 V$

Question 3

Consider the following statements regarding bistable multivibrator : 1. The bistable multivibrator is used as memory elements in shift registers, counters. 2. It is used to generate sine wave by sending regular triggering pulse to the input. 3. It can also be used as a frequency divider. Which of the above statements is/are correct?

Accepted Answer

1 and 3

Answer

3 only

Answer

2 only

Answer

1 and 2

Question 4

What is the percentage of resolution of the eight-bit DAC?

Accepted Answer

$0.392\%$

Answer

$0.0244\%$

Answer

$0.568\%$

Answer

$0.0148\%$

Question 5

What is the value of the capacitance to use in a capacitor filter connected to a full-wave rectifier operating at a standard aircraft power frequency of $400 Hz$, if the ripple factor is $10\%$ for a load of $500 \Omega$?

Accepted Answer

$72.2 \mu F$

Answer

$87.6 \mu F$

Answer

$25.2 \mu F$

Answer

$102.4 \mu F$

UPSC ESE Prelims 2026 Electrical Engineering Question Paper (08-Feb-2026)

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