226. In an autotransformer of voltage ratio V₁/V₂ and V₁ > V₂, the fraction of power transferred inductively is

1. 1. V1

      V2 + V2

   
   
   

   2. V2

      V1

   
   
   

   3. V1 − V2

      V1 + V2

   
   
   

   4. V1 − V2

      V1

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

227. If a sinusoidal voltage source is connected to a power transformer, its no-load current would be

1. 1. sinusoidal and lagging the voltage by 90°

   
   
   

   2. sinusoidal and lagging the voltage by less than 90°

   
   
   

   3. rich in third harmonic and its fundamental would lag the voltage by 90°

   
   
   

   4. rich in third harmonic and its fundamental would lag the voltage by less than 90°

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

228. Full-load voltage regulation of a power transformer is zero when power factor of the load is near

1. 1. unity and leading

   
   
   

   2. zero and leading

   
   
   

   3. zero and lagging

   
   
   

   4. unity and lagging

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

229. The torque of a reluctance motor can be effectively increased by

1. 1. increasing reluctance of the magnetic circuit along the direct axis

   
   
   

   2. decreasing reluctance of magnetic circuit along the quadrature

   
   
   

   3. increasing ratio of t he quadrature axis reluctance to the direct axis reluctance

   
   
   

   4. decreasing ratio of t he quadrature axis reluctance to direct axis reluctance

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

230. If height to width ratio of the window of core-type transformer is increased, then

1. 1. its leakage reactance and percentage voltage regulation will decrease

   
   
   

   2. its leakage reactance and percentage voltage regulation will increase

   
   
   

   3. its leakage reactance will be unaffected but total space in the window will increase to accommodate the windings better

   
   
   

   4. efficiency will increase and temperature rise will decrease

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---