AKTU Electrical Machine-II · Important Questions 2026Source: ryzenstudy.com PYQs
BEE503 Electrical Machine-II Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 3 AKTU Electrical Machine-II papers (2022-23–2024-25): 72 questions grouped into 41 distinct questions, 20 of which were asked in more than one paper.
- of marks were repeat questions
- —
- of marks were repeat questions
- questions asked in 2+ papers
- 20
- questions asked in 2+ papers
- papers analysed (2022-23–2024-25)
- 3
- papers analysed (2022-23–2024-25)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Not enough papers yet to measure this for this subject.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1:
22% of past marks| Question | Asked |
|---|---|
| Derive the EMF equation of an alternator. Explain the armature reaction in synchronous machines at (i) unity power factor, (ii) lagging power factor and (iii) leading power factor. | Asked 3× |
| Explain voltage regulation in synchronous generators. A 3-phase, 10 kVA, 400 V, 50 Hz star-connected alternator supplies the rated load at 0.8 power factor lagging. If the armature impedance is (0.5 + j10) ohm, find the voltage regulation using the synchronous impedance method. | Asked 2× |
| Why is a rotating field system used in preference to a stationary field in alternators? | Asked 2× |
| Explain parallel operation of alternators. What are the reasons for parallel operation? Also describe the necessary conditions for paralleling alternators. | Asked 2× |
Unit 2:
18% of past marks| Question | Asked |
|---|---|
| Explain why the synchronous motor does not have a starting torque. Describe the working principle and methods of starting of a synchronous motor. | Asked 3× |
| Explain the following for a synchronous motor: (i) V-curves (ii) Synchronous condenser. | Asked 3× |
| What are the effects of hunting in a synchronous motor? | Asked 3× |
| What is the function of a synchronous condenser? | Asked 2× |
Unit 3:
21% of past marks| Question | Asked |
|---|---|
| A 6-pole, 50 Hz, three phase induction motor running on full load develops a useful torque of 150 Nm at a rotor frequency of 1.5 Hz. Calculate the shaft power output. If the mechanical torque lost in friction is 10 Nm, determine (i) rotor copper loss, (ii) the input to the motor, and (iii) the efficiency. The total stator loss is 700 W. | Asked 3× |
| Derive the torque equation of a three phase induction motor. Also find the condition for maximum torque. A 746 kW, 3-phase, 50 Hz, 16 pole induction motor has a rotor impedance of (0.02 + j0.15) ohm at standstill. Find the speed of the motor at which maximum torque occurs. | Asked 2× |
| Define slip in an induction motor. A three phase, 50 Hz, 4-pole induction motor has a slip of 4%. Calculate the speed of the motor in r.p.m. | Asked 2× |
| Derive and draw the torque-slip characteristics of a 3-phase induction motor indicating starting, maximum torque and the operating region. | Asked 2× |
Unit 4:
21% of past marks| Question | Asked |
|---|---|
| What is the need of starters in three phase induction motors? Explain direct-on-line starter and autotransformer starter with proper diagram. | Asked 3× |
| What are the advantages of high-torque cage motors? Explain deep-bar cage motors and double-cage motors. | Asked 3× |
| Explain cogging and crawling in three phase induction motors. | Asked 3× |
| Discuss briefly the various methods of speed control of three phase induction motors. | Asked 2× |
Unit 5:
18% of past marks| Question | Asked |
|---|---|
| Explain the following: (i) Split phase motor (ii) Capacitor-start capacitor-run motor (iii) Shaded pole motor. | Asked 3× |
| How does a universal motor work on AC or on DC supply? | Asked 3× |
| Why are single phase induction motors not self-starting? Explain double revolving field theory of single phase induction motors (see original paper; text is split across two rows). | Asked 2× |
| List the different types of single-phase induction motors. | Asked 2× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
Starting methods and types · U5
8.7% (cum 9%)
Armature winding and EMF · U1
7.7% (cum 16%)
Starting methods · U4
7.4% (cum 24%)
Rotating field and principle · U3
6.2% (cum 30%)
Torque-slip characteristics · U3
6.1% (cum 36%)
Voltage regulation methods · U1
6% (cum 42%)
Synchronous motor starting · U2
6% (cum 48%)
Speed control methods · U4
5.7% (cum 54%)
Deep bar and double cage · U4
5.3% (cum 59%)
Double revolving field theory · U5
5.2% (cum 64%)
Efficiency and losses · U3
5% (cum 69%)
V-curves and excitation · U2
4% (cum 73%)
Constructional features · U1
3.6% (cum 77%)
Two reaction theory · U2
3.3% (cum 80%)
Hunting and damping · U2
3.3% (cum 83%)
Parallel operation · U1
2.3% (cum 86%)
Cogging and crawling · U4
2.3% (cum 88%)
Universal motor · U5
2.3% (cum 90%)
Torque and power equations · U3
1.9% (cum 92%)
Governor and frequency control · U1
1.7% (cum 94%)
No-load and blocked rotor tests · U5
1.7% (cum 96%)
Synchronous condenser · U2
1.6% (cum 97%)
Constructional features · U3
1.4% (cum 99%)
Equivalent circuit and phasors · U1
0.7% (cum 99%)
Phasor and equivalent circuit · U3
0.7% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| Starting methods and types · Unit 5 · Tier 1 | 3/3 | 8.7% |
| Armature winding and EMF · Unit 1 · Tier 1 | 3/3 | 7.7% |
| Starting methods · Unit 4 · Tier 1 | 3/3 | 7.4% |
| Rotating field and principle · Unit 3 · Tier 1 | 2/3 | 6.2% |
| Torque-slip characteristics · Unit 3 · Tier 1 | 2/3 | 6.1% |
| Voltage regulation methods · Unit 1 · Tier 1 | 3/3 | 6% |
| Synchronous motor starting · Unit 2 · Tier 1 | 3/3 | 6% |
| Speed control methods · Unit 4 · Tier 1 | 3/3 | 5.7% |
| Deep bar and double cage · Unit 4 · Tier 2 | 3/3 | 5.3% |
| Double revolving field theory · Unit 5 · Tier 2 | 2/3 | 5.2% |
| Efficiency and losses · Unit 3 · Tier 2 | 3/3 | 5% |
| V-curves and excitation · Unit 2 · Tier 2 | 3/3 | 4% |
| Constructional features · Unit 1 · Tier 2 | 3/3 | 3.6% |
| Two reaction theory · Unit 2 · Tier 2 | 2/3 | 3.3% |
| Hunting and damping · Unit 2 · Tier 3 | 3/3 | 3.3% |
| Parallel operation · Unit 1 · Tier 3 | 2/3 | 2.3% |
| Cogging and crawling · Unit 4 · Tier 3 | 3/3 | 2.3% |
| Universal motor · Unit 5 · Tier 3 | 3/3 | 2.3% |
| Torque and power equations · Unit 3 · Tier 3 | 1/3 | 1.9% |
| Governor and frequency control · Unit 1 · Tier 3 | 1/3 | 1.7% |
| No-load and blocked rotor tests · Unit 5 · Tier 3 | 1/3 | 1.7% |
| Synchronous condenser · Unit 2 · Tier 3 | 2/3 | 1.6% |
| Constructional features · Unit 3 · Tier 3 | 2/3 | 1.4% |
| Equivalent circuit and phasors · Unit 1 · Tier 3 | 1/3 | 0.7% |
| Phasor and equivalent circuit · Unit 3 · Tier 3 | 1/3 | 0.7% |
3.Paper pattern (2024-25)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 5 × 7 marks | Attempt any 3 |
| C | 11 × 7 marks | Attempt any 1 |
4.In the syllabus, never asked yet
Low priority, but read them once — a new paper can always start here.
- Armature reaction · U1
- Infinite bus and synchronizing power · U1
- Transient and sub-transient reactance · U2
- Power flow equations · U2
- No-load and blocked rotor tests · U3
- Induction generator · U3
- Rotor emf injection control · U4
- Equivalent circuit · U5
- Repulsion motor · U5
5.Study order
- 1Starting methods and types (Unit 5, Tier 1)
- 2Armature winding and EMF (Unit 1, Tier 1)
- 3Starting methods (Unit 4, Tier 1)
- 4Rotating field and principle (Unit 3, Tier 1)
- 5Torque-slip characteristics (Unit 3, Tier 1)
- 6Voltage regulation methods (Unit 1, Tier 1)
- 7Synchronous motor starting (Unit 2, Tier 1)
- 8Speed control methods (Unit 4, Tier 1)
- 9Deep bar and double cage (Unit 4, Tier 2)
- 10Double revolving field theory (Unit 5, Tier 2)
- 11Efficiency and losses (Unit 3, Tier 2)
- 12V-curves and excitation (Unit 2, Tier 2)
- 13Constructional features (Unit 1, Tier 2)
- 14Two reaction theory (Unit 2, Tier 2)
FAQ
Which units of BEE503 carry the most marks?
Unit 1 (, 22% of past marks) and Unit 3 (, 21% of past marks).
Do AKTU Electrical Machine-II questions repeat?
20 questions have appeared in more than one of the 3 papers so far. There are not enough papers yet to measure the repeat share reliably.
How is this list made?
Every question from the 3 papers (2022-23–2024-25) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
Study this subject
Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.