Q.1
14 Marks(b)
Explain the principal of motoring and regenerative braking mode of DC motor.
(c)
Discuss the block diagram of close loop DC drive with current limit control.
Also asked in Summer 2026 Q5c
Gujarat Technological UniversitySummer 2025 examination
GTU 3160919 Electric Drives Summer 2025 Question Paper & PDF
B.E. · Electrical Engineering · Semester 6 · Subject code 3160919
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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11 of 25 questions on this paper were also asked in other years. Each is marked below with the years it appeared.See all 10 repeated 3160919 questions, most asked first
Q.2
14 Marks(a)
Draw and explain different types of load torque speed characteristics.
Also asked in Summer 2026 Q5b
(b)
Draw torque speed characteristic of DC shunt motor and explain how change in armature voltage will change in speed of motor
(c)
Derive the output voltage equation of step-down chopper fed DC drive and explain the operation with necessary diagram and waveforms.
OR
(c)
Discuss the operation of Class E chopper fed DC drive with necessary diagram and waveforms.
Q.3
14 Marks(a)
Explain current controller specification for chopper-based speed control of separately excited DC motor.
Also asked in Summer 2026 Q3a
(b)
Based on the block diagram of close loop control of DC drives, derive the transfer function.
(c)
Explain the feature of PWM inverter fed Induction motor drive.
OR
(a)
Draw only block diagram of close loop armature control with field flux weaking.
(b)
Give of comparison between converter fed dc drives and chopper fed dc drives.
(c)
Explain the types of output voltage control methods with the help of chopper.
Also asked in Summer 2026 Q4b
Q.4
14 Marks(a)
How torque speed characteristic of induction motor will be modified with change in rotor resistance.
Also asked in Summer 2026 Q2b
(b)
What is slip speed control of induction motor drives?
(c)
Derive the torque equation from equivalent circuit of three phase induction motor.
OR
(a)
What is above base speed and below base speed operation of the motor?
(b)
What is slip power? What are the different methods used for control the slip power?
Also asked in Summer 2026 Q3c
(c)
Discuss principle of constant flux operation of induction motor in detail with necessary equation and diagram.
Q.5
14 Marks(b)
Draw and discuss motor characteristics for constant torque and flux weakening region.
Also asked in Summer 2026 Q2c OR
(c)
Draw the neat circuit diagram and explain the speed control of 3 phase induction motor by static scherbius system.
Also asked in Summer 2026 Q3c
OR
(a)
Explain three regions of torque speed characteristic of induction motor based on slip.
(b)
How torque speed characteristic of induction motor will be modified with
i)change in applied voltage
ii)change in applied frequency
Also asked in Summer 2026 Q2c
(c)
Discuss the operation of 3 phase AC voltage controller driven induction motor drive with necessary diagram and waveforms.
More Electric Drives papers
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
Other Semester 6 subjects
BE Electrical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Electric Drives (Summer 2025, B.E. · Electrical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.