Guess Paper 1: Electric Machines Fall – 2020 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1. Briefly define each of the following: a. Armature b. Brushes c. Load d. Induction motor e. Torque f. Shunt Motor g. Henry Q2. Differentiate between AC and DC generator. Q3. What is the counter-electromotive force (CEMF) and speed of rotation? Q4. What are mechanical and electrical losses? Explain Q5. Discuss the Wye and Delta connections briefly. Q6. Explain the three phase induction motor and their principle components. Q7. Discuss the ideal transformer under no-load and load conditions Q8. Write short Notes on any TWO. a. Magnetism b. Compound Generator c. Current TransformerGuess Paper 2:Electric Machines Spring – 2020 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1. Briefly define each of the following: a. Armature b. Brushes c. Load d. Induction motor e. Torque f. Shunt Motor g. Henry Q2. Differentiate between AC and DC generator. Q3. What is the counter-electromotive force (CEMF) and speed of rotation? Q4. What are mechanical and electrical losses? Explain Q5. Discuss the Wye and Delta connections briefly. Q6. Explain the three phase induction motor and their principle components. Q7. Discuss the ideal transformer under no-load and load conditions Q8. Write short Notes on any TWO. a. Magnetism b. Compound Generator c. Current TransformerGuess Paper 3: Electric Machines Fall – 2019 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Guess Paper 4: Electric Machines Fall – 2019 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1:- Auto transformer is used for which of the following schemes explain?
- Purpose of commutator in a DC machine?
- What are the advantages of stationary armature in a machine?
- Which on of the DC motors has high starting torque?
- What is residual magnetism. Why property of material retain magnetic flux?
- The rotor of synchronous machine is supplied with DC supply. True/False
- Transformer is an AC machine True/False
- Copper losses are occurs in iron core. True/False
- Armature copper losses are called permanent losses. True/False
- Open circuit test on transformer is performed in order to find core losses True/False
- Squirell cage induction motor has wound rotor True/False
- One unit of energy meter is equal to………?
- Core is laminated in order to minimize………?
- Synchronous condenser is used for ………….?
Guess Paper 5: Electric Machines Fall – 2018 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1:- Auto transformer is used for which of the following schemes explain?
- Purpose of commutator in a DC machine?
- What are the advantages of stationary armature in a machine?
- Which on of the DC motors has high starting torque?
- What is residual magnetism. Why property of material retain magnetic flux?
- The rotor of synchronous machine is supplied with DC supply. True/False
- Transformer is an AC machine True/False
- Copper losses are occurs in iron core. True/False
- Armature copper losses are called permanent losses. True/False
- Open circuit test on transformer is performed in order to find core losses True/False
- Squirell cage induction motor has wound rotor True/False
- One unit of energy meter is equal to………?
- Core is laminated in order to minimize………?
- Synchronous condenser is used for ………….?
Guess Paper 6: Electric Machines Fall – 2018 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1:- Define types of Alternator?
- Purpose of Sumpner or Back-to-Back Test?
- Define unity power factor?
- Define difference between relay and fuse?
- What is auto-transformer?
- A transformer is a static piece of equipment used either for raising or lowering the voltage of an AC supply with a corresponding decrease or increase in True/False
- Buchloz relay is used as sensing device in transformers only True/False
- Core loses are permanent loses True/false
- Core losses occur in armature winding. True/False
- Squirrel cage induction motor is rarely used in industry. True/False
- To determine the iron losses ………. test is performed.
- Synchronous motor and induction motor rotational speed are …….
- Armature reaction distorts ………… field
- Split phase induction motor has two windings i.e. main winding and ………
- Write four conditions for parallel operation
- Why Transformer Rating in KVA?
- Applications of 3 phase induction motor
Guess Paper 7: Electric Machines Fall – 2017 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q.1 a) chose the correct answer- A single phase induction motor employs ……………… rotor
- Squirrel cage b) wound c) both d) none
- An alternator is sometimes called …………………. Generator
- Synchronous b) asynchronous c) either a & b d) none
- The field winding of an alternator is ……………………. excited
- a) D.C b) A.C c) Both a & b d) None
- The Frequency of an EMF generated in an 8-pole alternator running at 900 RPM is …………………
- a) 50 Hz b) 60 Hz c) 120 Hz d) 100 Hz
- When a 3-Phase induction motor is at no load the slip is ………………….
- a) 1 b) 0.5 c) 0 d) Maximum
- b) Fill in the blanks
- The stator of a 3 phase induction motor produces ……………..Magnetic field.
- The primary and secondary of a transformer are ……………………….Coupled.
- A transformer is a efficient device because it is ……………………..
- 3-phase wound motors are also called ……………………..motor.
- Most of the single phase induction motor are ………………….pole machine.
- Stepper motor
- Write four conditions for parallel operation
- Voltage regulation of Alternator.
Guess Paper 8: Electric Machines Fall – 2017 Past Papers
Time Allowed: 3 hours
Total Marks: 70, Passing Marks (35)
Q1. Briefly define each of the following: a. Current b. Transformer c. Turns Ratio d. Motor e. Pole f. Rotor g. Carbon Brush Q2. What are magnetic circuits? Differentiate between AC and DC Machines. Q3. Explain the parallel operation of the generators. Q4. What are open and short circuit tests and for what purpose they have been used? Q5. Discuss the principle of operation of a synchronous motor. Q6. Differentiate between testing of machines by direct and indirect methods. Q7. What is auto transformer? What are the advantages and uses of auto transformers? Q8. Write short Notes on any TWO. a. Principle of DC machines b. Types of Starter c. Common faults in DC machinesElectrical Engineering Past Papers and Guess(EE)
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