MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If RR‘, YY‘ and BB‘ constitutes three phase sequence if V‘RR = Vmsinωt its corresponding field magnets are in clockwise direction, then the value of V‘BB is? |
| A. | Vmsin(ωt-240⁰) |
| B. | Vmsin(ωt-120⁰) |
| C. | Vmsin(ωt+240⁰) |
| D. | Vmsinωt |
| Answer» B. Vmsin(ωt-120⁰) | |
| 2. |
If RR‘, YY‘ and BB‘ constitutes three phase sequence if V‘RR = Vmsinωt its corresponding field magnets are in clockwise direction, then V‘YY =? |
| A. | Vmsinωt |
| B. | Vmsin(ωt+120⁰) |
| C. | Vmsin(ωt-120⁰) |
| D. | Vmsin(ωt-240⁰) |
| Answer» D. Vmsin(ωt-240⁰) | |
| 3. |
Phase sequence depends on the _________________ |
| A. | field |
| B. | rotation of the field |
| C. | armature |
| D. | rotation of the armature |
| Answer» C. armature | |
| 4. |
IF_RR‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚Àւ§,_YY‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚Àւ§_AND_BB‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚Àւ§_CONSTITUTES_THREE_PHASE_SEQUENCE_IF_V‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚Àւ§RR_=_VMSIN‚ÂÀ√¨‚ÀÖ¬¢T_ITS_CORRESPONDING_FIELD_MAGNETS_ARE_IN_CLOCKWISE_DIRECTION,_THEN_V‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚Àւ§YY_=??$# |
| A. | V<sub>m</sub>sinωt |
| B. | V<sub>m</sub>sin(ωt+120⁰) |
| C. | V<sub>m</sub>sin(ωt-120⁰) |
| D. | V<sub>m</sub>sin(ωt-240⁰) |
| Answer» D. V<sub>m</sub>sin(‚âà√¨‚àö¬¢t-240‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ª) | |
| 5. |
The_value_of_V‘BB_in_the_question_9_is?$# |
| A. | V<sub>m</sub>sin(ωt-240⁰) |
| B. | V<sub>m</sub>sin(ωt-120⁰) |
| C. | V<sub>m</sub>sin(ωt+240⁰) |
| D. | V<sub>m</sub>sinωt |
| Answer» B. V<sub>m</sub>sin(‚âà√¨‚àö¬¢t-120‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ª) | |
| 6. |
Phase sequence depends on the? |
| A. | field |
| B. | rotation of the field |
| C. | armature |
| D. | rotation of the armature |
| Answer» C. armature | |
| 7. |
In three phase system at any given instant, the algebraic sum of three voltages must be? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 8. |
In a two phase generator, the armature has two distinct windings that are displaced __________ apart. |
| A. | 45‚Äö√Ö‚àû |
| B. | 90‚Äö√Ö‚àû |
| C. | 135‚Äö√Ö‚àû |
| D. | 180‚Äö√Ö‚àû |
| Answer» C. 135‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ª | |
| 9. |
In three phase system, the three voltages (currents) differ in phase by __________electrical degrees from each other in a particular sequence. |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| D. | 120 |
| Answer» E. | |
| 10. |
Which motors are called self-starting motors? |
| A. | single phase |
| B. | two phase |
| C. | three phase |
| D. | four phase |
| Answer» D. four phase | |
| 11. |
When the power factor is __________ the power becomes zero 100 times a second in a 50Hz supply. |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 12. |
The percentage of power increased from single phase to three phase is? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» B. 100 | |
| 13. |
The power generated by a machine increases _____________ percent from single phase to two phase. |
| A. | 40.4 |
| B. | 41.4 |
| C. | 42.4 |
| D. | 43.4 |
| Answer» C. 42.4 | |