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May 2023 term · Electronic Systems Thinking and Circuits · EE1101

ESTC Qualifier: 6 August 2023 (May 2023 term)

The IIT Madras BS Electronic Systems Thinking and Circuits (ESTC) Qualifier paper sat on 6 Aug 2023, in the May 2023 term: 26 questions for 40 marks in 120 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.

Questions
26
Marks
40
Duration
120 min
MCQ
10
Numerical
16
Take as mock testPractise with answers

Updated

Official paper: IIT M ES QUALIFIER EXAM QPQ1 06 Aug 2023 · No negative marking.

Question 1

+1 markOne correct option

A circuit consisting of resistors, capacitors, and inductors is a linear circuit.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • A

    TRUE

Question 1 on its own page

Question 2

+1 markOne correct option

The rate of charging from a charger is determined by the current it can deliver.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • A

    TRUE

Question 2 on its own page

Question 3

+1 markOne correct option
  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • B

    FALSE

Question 3 on its own page

Question 4

+1 markOne correct option

The VI characteristic of an ideal 1V voltage source is a straight line passing through the origin.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • B

    FALSE

Question 4 on its own page

Question 5

+1 markOne correct option

A water heater with a smaller coil resistance will take longer to heat when plugged into the same power source.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • B

    FALSE

Question 5 on its own page

Question 6

+1 markOne correct option
  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • A

    TRUE

Question 6 on its own page

Question 7

+1 markOne correct option

Ampere-Hour is the unit of energy.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • B

    FALSE

Question 7 on its own page

Question 8

+1 markOne correct option

A heater dissipates a power P when connected to a 110V socket in the Indian Railways. It will dissipate a power of 4P when connected to a 220V socket at home.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • A

    TRUE

Question 8 on its own page

Question 9

+1 markOne correct option

An ideal 1500mAh battery is driving a load that draws a constant current of 0.1A. The fully charged battery will drain out in 10 hours.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • B

    FALSE

Question 9 on its own page

Question 10

+1 markOne correct option

When a coil rotates in a fixed magnetic field at 1000 RPM it produces a Sinusoidal voltage with an RMS value of 10V . If it now rotates at 2000 RPM the RMS value would be 20V.

  1. A

    TRUE

  2. B

    FALSE

Show answer

Correct answer

  • A

    TRUE

Question 10 on its own page

Question 11

+2 marksNumerical answer

Two heater coils of resistance 60Ω and 40Ω respectively are immersed together in a bucket of water. The effective resistance that is heating the water is __________Ω

Show answer

Correct answer: 24

Question 11 on its own page

Question 12

+2 marksNumerical answer
Show answer

Correct answer: 1.5

Question 12 on its own page

Question 13

+2 marksNumerical answer

A 72V 2.88kWh Lithium-ion battery is used in an electric scooter. The rating of the battery is ________ Ah.

Show answer

Correct answer: 40

Question 13 on its own page

Question 14

+2 marksNumerical answer

The power usage is as follows on a daily basis in a given house. Assume the appliance is consuming power as long as it is ON.
1. 3 bulbs of 30W for 5 hours 2. 4 tube lights of 50W for 8 hours 3. 1 Air Conditioner of 1000W for 1 hour
Answer the following about the monthly (30 days) consumption in this house. Note: 1 unit = 1kWhr.
The total number of units consumed in a month = ________ .

Show answer

Correct answer: 91.5

Question 14 on its own page

Question 15

+2 marksNumerical answer

The power usage is as follows on a daily basis in a given house. Assume the appliance is consuming power as long as it is ON.
1. 3 bulbs of 30W for 5 hours 2. 4 tube lights of 50W for 8 hours 3. 1 Air Conditioner of 1000W for 1 hour
Answer the following about the monthly (30 days) consumption in this house. Note: 1 unit = 1kWhr.
The number of units consumed in a month by the three bulbs = ___________ .

Show answer

Correct answer: 13.5

Question 15 on its own page

Question 16

+2 marksNumerical answer

The current, in mA, through R3 when the 6V supply is alone energised = ________

Show answer

Correct answer: 0.3

Question 16 on its own page

Question 17

+2 marksNumerical answer

The current, in mA, through R3 when the 3V supply is alone energised = __________

Show answer

Correct answer: 0.15

Question 17 on its own page

Question 18

+2 marksNumerical answer

The current, in mA, through R3 when the 12V supply is alone energised =___________

Show answer

Correct answer: -1.2

Question 18 on its own page

Question 19

+2 marksNumerical answer

The current, in mA, through R3 when all three voltage sources are energised = __________

Show answer

Correct answer: -0.75

Question 19 on its own page

Question 20

+2 marksNumerical answer

The voltage, in V , across R3 when all three voltage sources are energised = __________

Show answer

Correct answer: -3.75

Question 20 on its own page

Question 21

+2 marksNumerical answer

Based on the above data, answer the given subquestions.

The value of R1 in kΩ = ______

Show answer

Correct answer: 10

Question 21 on its own page

Question 22

+2 marksNumerical answer

Based on the above data, answer the given subquestions.

The value of R2 in kΩ = ______

Show answer

Correct answer: 5

Question 22 on its own page

Question 23

+2 marksNumerical answer

Based on the above data, answer the given subquestions.

Show answer

Correct answer: 0.75

Question 23 on its own page

Question 24

+2 marksNumerical answer

Based on the above data, answer the given subquestions.

Show answer

Correct answer: 0.25

Question 24 on its own page

Question 25

+1 markNumerical answer

Based on the above data, answer the given subquestions.

Show answer

Correct answer: 0.75

Question 25 on its own page

Question 26

+1 markNumerical answer

Based on the above data, answer the given subquestions.

Show answer

Correct answer: 0.25

Question 26 on its own page