Objective Questions Short notes Objective questions (Answers are given below) The starting winding of a single-phase motoris placed in the(a) rotor (b) stator(c) armature (d) field. One of the characteristics of a single- phasemotor is that it(a) is self-starting(b) is not self-starting(c) requires only one winding(d) can rotate in one direction only. After the starting … Read more
Objective Questions Short notes Objective questions (Answers are given below) 1.In the circle diagram for a 3-φ induction motor,the diameter of the circle is determined by(a) rotor current(b) exciting current(c) total stator current(d) rotor current referred to stator. Answer : C 2.Point out the WRONG statement.Blocked rotor test on a 3-φ induction motorhelps to find(a) … Read more
Objective Questions Short notes Objective questions (Answers are given below) Regarding skewing of motor bars in a squirrelcageinduction motor, (SCIM) which statementis false ?(a) it prevents cogging(b) it increases starting torque(c) it produces more uniform torque(d) it reduces motor ‘hum’ during its operation. The principle of operation of a 3-phase. Inductionmotor is most similar to … Read more
Objective Questions Short notes Objective questions (Answers are given below) Which of the following connections is best suitedfor 3-phase, 4-wire service ?(a) Δ − Δ (b) Y − Y(c) Δ − Y (d) Y − Δ In a three-phase Y-Y transformer connection,neutral is fundamental to the(a) suppression of harmonics(b) passage of unbalanced currents due tounbalanced … Read more
Objective Questions Short notes Objective questions (Answers are given below) A transformer transforms(a) frequency(b) voltage(c) current(d) voltage and current. Which of the following is not a basic element ofa transformer ?(a) core(b) primary winding(c) secondary winding(d) mutual flux. In an ideal transformer,(a) windings have no resistance(b) core has no losses(c) core has infinite permeability(d) all … Read more