Objective Questions Short notes Objective questions (Answers are given below) The total energy of a revolving electron in anatom can(a) have any value above zero(b) never be positive(c) never be negative(d) not be calculated. An atom is said to be ionised when any one ofits orbiting electron(a) Jumps from one orbit to another(b) is raised … Read more
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) 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) One of the main advantages of Swinburne’s testis that it(a) is applicable both to shunt and compoundmotors(b) needs one running test(c) is very economical and convenient(d) ignores any charge in iron loss The main disadvantage of Hopkinson’s test forfinding efficiency of shunt d.c. motors is … Read more
Objective Questions Short notes Objective questions (Answers are given below) The speed of a d.c. motor can be controlled byvarying(a) its flux per pole(b) resistance of armature circuit(c) applied voltage(d) all of the above The most efficient method of increasing thespeed of a 3.75 kW d.c. shunt motor would bethe ………..method.(a) armature control(b) flux control(c) … Read more