260. When a delta connected primary of a 3-phase transformer isconnected to 3-phase supply
A. magnetizing current in phase winding will carry third harmonics but line current will be free from it
B. magnetizing current in phase winding will contain third harmonics and line current will also contain third harmonics
C. magnetizing current in phase winding will not contain third harmonics but line current will contain third harmonics
D. none of the above

---

261. Scott connections are used to convert
A. three-phase supply to D.C. supply
B. three-phase supply to three-phase supply
C. three-phase supply to two-phase supply
D. three-phase supply to single-phase supply

---

262.  The function of an instrument transformer is to
A. act as an isolating device to protect equipment and operation personnel from high voltages
B. act as a radio device to enable the use of standardized low range instruments
C. discharge both of the above functions
D. discharge none of the above functions

---

263.  Which of the following 3-phase connections of transformer create disturbances in communication systems
A. star/delta
B. delta/star
C. star/star
D. delta/delta

---

264.  delta-delta power transformer is protected by current transformer having
A. star/star connections
B. delta/delta connections
C. star/delta connections
D. delta/star connections

---

265.  star-star power transformer is protected by current transformer having
A. star/star connections
B. delta/delta connections
C. star/delta connections
D. delta/star connections

---

266.  When a transformer winding suffers a short?circuit, the adjoining turns of the same winding experience
A. an attractive force
B. a repulsive force
C. no force
D. none of the above

---