21. A cable carrying alternating current has A. Hysteresis losses only B. Hysteresis and leakage losses only C. Hysteresis, leakage and copper losses only D. Hysteresis, leakage, copper and friction losses Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
22. In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted. A. Yes B. No Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
23. The minimum dielectric stress in a cable is at A. Armour B. Bedding C. Conductor surface D. Lead sheath Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
24. The breakdown voltage of a cable depends on A. Presence of moisture B. Working temperature C. Time of application of the voltage D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
25. High tension cables are generally used up to A. 11 kV B. 33 kV C. 66 kV D. 132 kV Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
26. Low tension cables are generally used up to A. 200 V B. 500 V C. 700 V D. 1000 V Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
27. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become A. One half B. Double C. Four times D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
28. The breakdown of insulation of the cable can be avoided economically by the use of A. Inter-sheaths B. Insulating materials with different dielectric constants C. Both (A) and (B) D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
29. In a cable, the maximum stress under operating conditions is at A. Insulation layer B. Sheath C. Armour D. Conductor surface Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
30. Capacitance grading of cable implies A. Use of dielectrics of different permeabilities B. Grading according to capacitance of cables per km length C. Cables using single dielectric in different concentrations D. Capacitance required to be introduced at different lengths to counter the effect of inductance Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
