Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part3 : 1 to 5
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.Which of the following method of speed control of D.C. machine will offer minimum efficiency ? |
| Voltage control method |
| Field control method |
| Armature control method |
| All above methods |
2.Sparking, is discouraged in a D.C. motor because |
| it increases the input power con-sumption |
| commutator gets damaged |
| both (a) and (b) |
| none of the above |
3.The speed of a D.C. motor can be varied by varying |
| field current |
| applied voltage |
| resistance in series with armature |
| any of the above |
4.If I2 be the armature current, then speed of a D.C. shunt motor is |
| independent of Ia |
| proportional to la |
| varies as (Ia) |
| varies as la |
5.Which D.C. motor is generally preferred for cranes and hoists ? |
| Series motor |
| Shunt motor |
| Cumulatively compounded motor |
| Differentially compounded motor |
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