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.
**131. When a conductor carries more current on the surface as compared to core, it is due to?**
A. permeability variation
B. corona
C. **skin effect**
D. unsymmetrical fault
E. none of the above
**132. The following system is not generally used?**
A. 1-phase 3 wire
B. **1-phase 4 wire**
C. 3-phase 3 wire
D. 3-phase 4 wire
**133. The skin effect of a conductor will reduce as the?**
A. resistivity of conductor material increases
B. permeability of conductor material increases
C. **diameter increases**
D. frequency increases
**134. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?**
A. **Current will flow to earth**
B. Supply voltage will drop
C. Supply voltage will increase
D. No current will flow in the conductor
E. None of the above
**135. By which of the following systems electric power may be transmitted?**
A. Overhead system
B. Underground system
C. **Both A. and (b)**
D. None of the above
**136. _____________are the conductors, which connect the consumer’s terminals to the distribution?**
A. Distributors
B. **Service mains**
C. Feeders
D. None of the above
**137. The underground system cannot be operated above?**
A. 440 V
B. 11 kV
C. **33 kV**
D. 66 kV
**138. Overhead system can be designed for operation up to?**
A. 11 kV
B. 33 kV
C. 66 kV
D. **400 kV**
**139. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as?**
A. **Kelvin’s law**
B. Ohm’s law
C. Kirchhoffs law
D. Faraday’s law
E. none of the above
**140. The wooden poles well impregnated with creosote oil or any preservative compound have life?**
A. from 2 to 5 years
B. 10 to 15 years
C. **25 to 30 years**
D. 60 to 70 years