electrical engineering mcqs

GURU MCQs provides Electrical Engineering MCQs for Job Test and Interview Preparation, suitable for fresh graduates, students, and competitive exams. Most repeated Electrical Engineering MCQs section is frequently encountered in CSS, PMS, Inspector, ASI, Sub-inspector, Constable, FPSC, PPSC, ETEA, FIA, Police, Army, Navy, Airforce, IB, MOFA, ASF, LHC, Educators, and various other competitive exams, as well as government and private job assessments. Electrical Engineering most repeated MCQs include Analog and Digital Communications, Control Systems, Power Electronics, Electric Circuits, Electric machines, Electrical measurement & units, Utilization of Electrical Energy, Basic Electrical Engineering, Electrical Installation, Power Systems, Testing & maintenance of electrical equipment’s – and much more.

**151. The operating voltage of supertension cables is up to?**

A. 3.3 kV
B. 6.6 kV
C. **11 kV**
D. 33 kV

**152. The operating voltage of extra high tension cables is up to?**

A. 6.6 kV
B. 11 kV
C. **33 kV**
D. 66 kV
E. 132 kV

**153. Which of the following methods is used for laying of underground cables?**

A. Direct laying
B. Draw-in-system
C. Solid system
D. **All of the above**

**154. Due to which of the following reasons the cables should not be operated too hot?**

A. The oil may lose its viscosity and it may start drawing off from higher levels
B. Expansion of the oil may cause the sheath to burst
C. Unequal expansion may create voids in the insulation which will lead to ionization
D. The thermal instability may rise due to the rapid increase of dielectric losses with temperature
E. **All of the above**

**155. Which of the following D.C. distribution systems is the simplest and lowest in first cost?**

A. **Radial system**
B. Ring system
C. Inter-connected system
D. None of the above

**156. A booster is a?**

A. **series wound generator**
B. shunt wound generator
C. synchronous generator
D. none of the above

**157. Besides a method of trial and error, which of the following methods is employed for the solution of network problems in the interconnected system?**

A. Circulating current method
B. Thevenin’s theorem
C. Superposition of currents
D. Direct application of Kirchhoff’s laws
E. **All of the above**

**158. The voltage of the single phase supply to residential consumers is?**

A. 110 V
B. 210 V
C. **230 V**
D. 400 V

**159. Most of the high transmission lines in Pakistan are?**

A. underground
B. **overhead**
C. either of the above
D. none of

**160. The artificial draught normally is designed to produce____________?**

A. less smoke
B. more draught
C. less chimney gas temperature
D. **all of the above**

**161. The main source of production of biogas is__________________?**

A. human waste
B. wet cow dung
C. wet livestock waste
D. **all above**

**162. In fuel cell, the ___________ energy is converted into electrical energy?**

A. mechanical
B. **chemical**
C. heat
D. sound

**163. Solar thermal power generation can be achieved by_______________?**

A. **using focusing collector or heliostates**
B. using flat plate collectors
C. using a solar pond
D. any of the above system

**164. The energy radiated by sun on a bright sunny day is approximately______________?**

A. 700 W/m²
B. 800 W/m²
C. **1 kW/m²**
D. 2 kW/m²

**165. The overall efficiency of thermal power plant is equal to____________?**

A. Rankine cycle efficiency
B. Carnot cycle efficiency
C. Regenerative cycle efficiency
D. **Boiler efficiency x turbine efficiency x generator efficiency**

**166. Rankine cycle efficiency of a good steam power plant may be in the range of____________?**

A. 15 to 20 per cent
B. **35 to 45 per cent**
C. 70 to 80 per cent
D. 90 to 95 per cent

**167. Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2__________?**

A. has higher thermal efficiency than the Carnot cycle operating between same pressure limits
B. **has lower thermal efficiency than Carnot cycle operating between same pressure limits**
C. has same thermal efficiency as Carnot cycle operating between same pressure limits
D. may be more or less depending upon the magnitude of p1 and p2

**168. Rankine efficiency of a steam power plant____________?**

A. improves in summer as compared to that in winter
B. **improves in winter as compared to that in summer**
C. is unaffected by climatic conditions
D. none of the above

**169. Carnot cycle comprises of_______?**

A. two isentropic processes and two constant volume processes
B. **two isentropic processes and two constant pressure processes**
C. two isothermal processes and three constant pressure processes
D. none of the above

**170. In Rankine cycle the work output from the turbine is given by__________?**

A. change of internal energy between inlet and outlet
B. **change of enthalpy between inlet and outlet**
C. change of entropy between inlet and outlet
D. change of temperature between inlet and outlet

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