Electrical Machines II (KEE503) - AKTU Question Paper 2021-22
B.Tech · Semester 5 · Free PDF Download
This is the official AKTU Electrical Machines II Previous Year Question Paper for B.Tech Semester 5, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 5
Session:2021-22
University:AKTU / UPTU
Rate this paper
Questions Asked in 2021-22
Electrical Machines II (KEE503) — complete question paper
Section AAttempt ail questions in brief. 2x 10=20
- aName the method of regulation known as optimistic method and why it is so called?
- bWhat is the necessity of chording in the armature winding of alternator?
- cWhat is the necd of parallel operation of two altemators?
- dDefine d-axis and q-axis synchronous reactance of the salient pole machine
- eName two types of induction motor based on rotor construction
- fCalculate the slip for 2-pole, 50 Hz induction motor running at 2950 rpm
- gDefine crawling in an induction motor
- hWhat are the advantages of skewing rotor bars in squirrel cage induction motor? i. Classify single phase induction motor j. Single phase induction motor is not self-starting. Give reason
Section BAttempt any one part of the following: 10x1=10
- aDiscuss the effects of armature reaction on the terminal voltage of alternator at (i) Zero pf lagging (ii) Zero pf leading and (iii) 0.8 pf lagging & (iv) Unity pf. Also, discuss synchronous impedance method for finding voltage regulation of
- acylindrical rotor machine. oe
- bExplain in detail, hunting phenomenon in synchronous motor. Classify its causes and explain how they can be reduced —_ c.: Sketch and derive the Torque-Slip characteristics of a 3-phase induction motor indicating starting and maximum torque and the operating region. A 3-phase induction motor has a starting torque of 100% and maximum torque of 200% of full load torque. Determine slip at maximum torque and full load slip
- dA 3-phase delta connected cage type induction motor when connected directly to 400 V, 50 Hz supply takes a starting’current of 100A in each stator phase calculate (i) The line current for DOL starting. (ii) Line and phase starting currents for star-delta starting. (iii) Line and phase currents for 70 % tapping on auto transformer starting. =...)
- eDevelop equivalent circuit diagram of single-phase induction motor based on double revolving field theory, ‘SECTION C
- aDerive emf equation for an alternator. Also, develop expressions of pitch factor and distribution factor
- bA 3-phase, 2-pole, 50 Hz, star-connected turboalternator has 54 slots with 4 conductors per slot. The pitch of the coil is 2 slots less than the pole pitch. Determine the useful flux per pole required to generate a line voltage of 3.3. https://www.aktuonline.com UY OA AA Subject Code: KEES03 PAPER ID-410606 ‘ Roll No
- aDraw and explain the phasor diagram of a salient pole synchronous generator supplying full-load lagging current. Show that the power output per phase is . ErV, Ve xo-x,.. given by P= “sind faite 2@ where the notations have their usual meaning
- bExplain how a synchronous motor operates as a synchronous condenser with the help of phasor diagram. A small industrial load of 500 kW at 0.6 pf lagging is supplied from a 3300 V. 3-phase, 50 Hz system. It is desired to raise the pf of the entire system to 0.8 lagging by means of a synchronous motor, which is also driving a pump so that the synchronous motor takes 100 kW from the lines. Determine the rating of synchronous motor
- aExplain the (i) effect of varying of excitation of a synchronous generator connected to infinite busbar on the power factor, armature current and load angle and (ii) effect of load changes on a synchronous motor with the help of phasor diagrams
- bDraw power flow diagram showing how electrical input is converted in to mechanical power output in an induction motor. A 4 pole, 400 V 3- phase, 50 Hz squirrel cage induction motor runs at speed of 1450 rpm at 0.85 pf lagging developing 11 kW power. The stator losses are 1100 W and mechanical losses are 400 W. Calculate (i) slip (ii) rotor copper loss (iii) rotor frequency (iv) line current (v) efficiency. https://www.aktuonline.com
- aWhat is the necessity of starter in induction motor? With the help of neat diagram, discuss auto transformer and star-delta method of starting a squirrel cage induction motor. Also, discuss the limitations of these methods
- bWith the help of circuit diagram discuss speed control of induction motor by consequent pole method (ii) Rotor rheostat control and (iii) stator voltage control
- aWrite short notes on (i) Capacitor start motor (ii) Shaded pole motor and (iii) Repulsion motor
- bA 220 V, phase induction motor give the following test results: Blocked rotor test : 120 V 9.6A 460W No load test :220V4.6A 125 W The stator winding resistance is 1.5 Q and during blocked rotor test, the starting winding is open. Determine equivalent circuit parameters https://www.aktuonline.com
Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.
Repeated Questions — KEE503
Questions that appeared in more than one session, found by comparing 3 years of Electrical Machines II papers (2021-22, 2022-23, 2023-24)
3x
Define crawling in an induction motor
Appeared in: 2021-22 · 2022-23 · 2023-24
3x
Derive emf equation for an alternator. Also, develop expressions of pitch factor and distribution factor
Appeared in: 2021-22 · 2022-23 · 2023-24
2x
What is the necd of parallel operation of two altemators?
Appeared in: 2021-22 · 2023-24
2x
Name two types of induction motor based on rotor construction
Appeared in: 2021-22 · 2022-23
More B.Tech Semester 5 (2021-22) Papers
Other subjects from same semester and session
Advance Welding2021-22Ic Engine Fuel And Lubrication2021-22Application Of Soft Computing2021-22Optical Communication2021-22Web Technology2021-22Vlsi Technology2021-22Heat And Mass Transfer2021-22Compiler Design2021-22
View all B.Tech Semester 5 2021-22 papers →Syllabus & More PYQs
Paper solve karne se pehle unit-wise syllabus dekh lo