UPSC Recruitment Paper 2018 : Lecturer (Electrical Engineering)

1. Which of the following features of solute and solvent atoms that determine the degree to which the solute dissolves in solvent?
1. Atomic size factor
2. Crystal structure
3. Electronegativity
4. Valances
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4

2. A solenoid is 0.25 m long, having 1000 Turns and has 2.5 A current flowing through it in a vacuum chamber. When placed in pure oxygen environment, the magnetic induction exhibits an increase of 1.04 × 10−8 Wb/m2. The magnetic susceptibility of oxygen will be nearly:
(a) 8.3 × 10−3
(b) 83 × 10−3
(c) 8.3 × 10−7
(d) 83 × 10−7

3. Which one of the following materials is having higher dielectric strength?
(a) Polyethylene
(b) Polyvinylchloride
(c) Mica
(d) Transformer oil

4. Which one of the following breakdown occur s due to an excessive voltage applied to a dielectric material?
(a) Thermal breakdown
(b) Intrinsic breakdown
(c) Defect breakdown
(d) Surface breakdown

5. Which of the following are classified as magnetic materials?
(a) Ferro, Piezo, Pyro, Dia materials
(b) Smooth and Hard materials
(c) Crystal, Pyro and Soft materials
(d) Dia, Para, Ferro, Anti Ferro and Ferrimagnetic materials

6. For electrical contacts used in switches, brushes and r elays, the material must possess:
1. High electrical conductivity
2. High thermal conductivity
3. High melting point
4. Good oxidation resistance
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4

7. Consider the following prop erties:
1. Highly coherent (both Spatial and Temporal)
2. Highly monochromatic
3. Highly directional
4. Sharply focused
The above properties are applicable to which one of the following?
(a) Light Amplification by Stimulated Emission of Radiation
(b) Optical Resonator
(c) Semiconductor
(d) Optical Fibre

8. Materials for which the resistivity at a very low temperature abruptly plunges from a finite value to one that is virtually zero and remains there upon further cooling are called:
(a) Low conductors
(b) Superconductors
(c) High conductors
(d) Extremely high conductors

9. Which one of the following statements is not correct?
(a) Ferrites are hard and brittle materials
(b) Ferrites have higher thermal conductivity
(c) Ferrites have a high resistivity
(d) Ferrites cannot be shaped by ordinary machining process

10. According to Kirchhoff’s Voltage Law (KVL), the algebraic sign of an IR drop is primarily dependent upon the:
(a) Amount of current flowing though it
(b) Value of R
(c) Direction of current flow
(d) Battery connection