Here I am providing previous year question papers of IES Examination for your reference:

UPSC IES Exam Question Paper

Consider the following statements:
The output of a linear circuit, driven with a sine wave at a frequency f, is itself a sine wave
1. at the same frequency
2. with chance of changed amplitude
3. with chances of changed amplitude and phase
Which of the above statements is/are correct?
(A) 1 and 2 (B) 1 only
(C) 1 and 3 (D) 2 only
Key: (C)

Consider the following statements:
The main contribution to photoconduction is by
1. the generation of electron and hole pair by a photon
2. a donor electron jumping into the conduction band because of a photon’s energy
3. a valence electron jumping into an acceptor state because of a photon’s energy
Which of the above statements is/are correct?
(A) 1 only (B) 2 only
(C) 3 only (D) 1, 2 and 3
Key: (A)

Thermal runaway is not possible in FET because as the temperature of the FET increases
(A) Mobility decreases
(B) trans-conductance increases (C) drain current increases
(D) trans-conductance decreases
Key: (A)

A signal may have frequency components which lie in the range of 0.001 Hz to 10 Hz.
Which one of the following types of couplings should be chosen in a multistage amplifier designed to amplify the signal?
(A) Capacitor coupling
(B) Direct coupling
(C) Transformer coupling
(D) Double-tuned transformer coupling
Key: (B)

If an input impedance of op-amp is finite, then which one of the following statements related to virtual ground is correct?
(A) Virtual ground condition may exist.
(B) Virtual ground condition cannot exist.
(C) In case of op-amp, virtual ground condition always exists.
(D) Cannot make a valid declaration.
Key: (B)

Hysteresis is desirable in a Schmitt trigger because
(A) energy is to be stored/discharged in parasitic capacitances
(B) effects of temperature variations would be compensated
(C) devices in the circuit should be allowed time for saturation and de-saturation
(D) it would prevent noise from causing false triggering
Key: (D)

In a photoconductive cell, the resistance of the semiconductor material varies with intensity of incident light
(A) directly (B) inversely
(C) exponentially (D) logarithmically
Key: (A)
In graded index multimode optical fiber the refractive index of the core is
(A) uniform across its radial distance, except for the cladding
(B) maximum at the fiber axis and ecreases stepwise towards the cladding
(C) maximum at the fiber axis and decreases gradually towards the cladding
(D) maximum at the fiber axis and increases stepwise towards the cladding
Key: (C)
Consider the following factors:
1. Number of turns of the coil
2. Length of the coil
3. Area of cross-section of the coil
4. Permeability of the core
On which of the above factors does inductance depend?
(A) 1, 2 and 3 only (B) 1, 3 and 4 only
(C) 1, 2, 3 and 4 (D) 2 and 4 only
Key: (C)

UPSC IES Exam Question Paper

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