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This document is an exam question paper that covers various topics in electrical technology related to electronics and communication engineering. It contains two parts - Part A with short answer questions worth 25 marks total, and Part B with longer answer questions worth 50 marks total split into 5 units. The questions cover topics like DC generators, transformers, induction motors, synchronous generators, instruments, and applications of motors.

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122 views2 pages

WWW - Manaresults.Co - In: (Electronics and Communication Engineering)

This document is an exam question paper that covers various topics in electrical technology related to electronics and communication engineering. It contains two parts - Part A with short answer questions worth 25 marks total, and Part B with longer answer questions worth 50 marks total split into 5 units. The questions cover topics like DC generators, transformers, induction motors, synchronous generators, instruments, and applications of motors.

Uploaded by

mushahed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Code No: 133AN R16

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD


B.Tech II Year I Semester Examinations, November/December - 2017
ELECTRICAL TECHNOLOGY
(Electronics and Communication Engineering)
Time: 3 Hours Max. Marks: 75

Note: This question paper contains two parts A and B.


Part A is compulsory which carries 25 marks. Answer all questions in Part A.
Part B consists of 5 Units. Answer any one full question from each unit.
Each question carries 10 marks and may have a, b, c as sub questions.

PART- A
(25 Marks)
1.a) What is critical field resistance and critical speed of a d.c generator? [2]
b) Write the expressions for core losses and remedial measures to reduce them in a
dc machine. [3]
c) What is the principle of operation of single phase transformer? [2]
d) Derive the condition for maximum efficiency of a 1-phase transformer. [3]
e) Define slip. [2]
f) Define crawling and cogging. [3]
g) Write the EMF equation of Alternator. [2]
h) Define Distribution and Coil span factors. [3]
i) What is the difference between Moving Coil and Moving iron Instruments? [2]
j) What are the applications of stepper motor? [3]

PART-B
(50 Marks)
2.a) Derive emf equation of dc generator.
b) Explain Magnetization and load characteristics of DC generators. [5+5]
OR
3. Discuss the various methods of speed control of a D.C motor. [10]

4.a) Derive an emf equation of a single phase transformer.


b) Explain about hysteresis and eddy current losses occur in a transformer. [5+5]
OR
5. A 10kVA, 1-phase, 50Hz, 500/250V transformer gave following test results:
OC test (LV) side: 250V, 3.0A, 200W
SC test (HV) side: 25V, 20A, 300W
Calculate efficiency and regulation at full-load, 0.8 p.f lagging. [10]

6.a) Explain Principle of operation of three-phase induction motors.


b) Distinguish the difference between squirrel cage and slip ring induction motor.
[5+5]
OR
7. Explain different starting methods of 3-phase induction motor. [10]

WWW.MANARESULTS.CO.IN
8.a) Draw the phasor diagram of the synchronous generator on load. Explain the
meaning synchronous reactance.
b) Explain constructional features of alternator. [5+5]
OR
9.a) Explain the Principle of operation of alternator.
b) Write short notes on SC,OC tests on alternator. [5+5]

10.a) Explain the construction and operation of an a.c. tachometer.


b) How the shaded pole motor works explain in detail? [5+5]
OR
11.a) Explain construction and working of moving coil instruments.
b) What are the applications of synchro? [5+5]

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WWW.MANARESULTS.CO.IN

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