Code No: R05311801 R05 Set No. 2
III B.Tech I Semester Supplementary Examinations,June 2010
ELECTRICAL ENGINEERING Metallurgy And Material Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) How do you classify induction motors? Give the constructional details of them.
(b) A 3-Φ Induction motor with R2
2
= 0.5 has a starting torque of 25N-m for
negligible stator impedence and no load current. Determine the starting torque
when the rotor circuit resistance per phase is i. doubled
ii. halved. [6+10]
2. (a) State and Explain Faraday's laws of electromagnetic induction. Distinguish between self induced and mutually induced voltage.
(b) Determine the resistance across the terminals, 'a and b' of the interconnected resistors shown in the figure 1b. [8+8]
Figure 1b
3. (a) Discuss the construction and principle of operation of a 3-phase Synchronous
Generator.
(b) A 3-phase, 4-pole, 50-Hz, star-connected alternator has 60 slots with 2 con- ductors per slot and having armature winding of the double layer type. Coils are short-pitched, that is, if one coil side lies in slot number 1, the other coil side lies in slot number 13. Find the useful flux per pole required to induce a line voltage of 6.6 kV. [8+8]
4. (a) With a neat sketch, explain the operation of three point starter.
(b) If the load is removed from a D.C series motor, what will happen? [8+8]
5.(a) In a 120V compound generator, the resistance of armature shunt and series winding are 0.06Ω , 25Ω & 0.04Ω respectively. The load current is 100A at 120V. Find the induced emf and the armature current when the machine is connected as
1
Code No: R05311801 R05 Set No. 2
(i) long shunt
(ii) short shunt.
(b) How will the ampere turns of the series field be changed if diverters of 0.1 Ω be connected in parallel with the series field winding? Neglect brush contact drop and ignore armature reaction. [16]
6. Describe the exact and approximate equivalent circuit of a single phase transformer.
Also describe experiments to obtain the parameters of the equivalent circuit. [16]
7. (a) For a series resonant circuit, obtain the expression for bandwidth in terms of resonant frequency and quality factor.
(b) A balanced 3-phase, delta connected load of (2+j3) Ω/phase is connected to a balanced 3-phase, 440V supply. The phase current is 10A. Find total active power, reactive power and total apparent power in the circuit. [8+8]
8. (a) Derive the Torque equation for moving iron instruments.
(b) The inductance of a moving iron instrument is given by L = (0.01 + Bθ)2 mH, Where θ is the deflection from zero position in degrees . The angular deflection of the instrument corresponding to 1.5 A and 2A respectively is 900and 1200.
Find the value of B. [8+8]
? ? ? ? ?
2
Code No: R05311801 R05 Set No. 4
III B.Tech I Semester Supplementary Examinations,June 2010
ELECTRICAL ENGINEERING Metallurgy And Material Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) For a series resonant circuit, obtain the expression for bandwidth in terms of
resonant frequency and quality factor.
(b) A balanced 3-phase, delta connected load of (2+j3) Ω/phase is connected to a balanced 3-phase, 440V supply. The phase current is 10A. Find total active power, reactive power and total apparent power in the circuit. [8+8]
2. Describe the exact and approximate equivalent circuit of a single phase transformer.
Also describe experiments to obtain the parameters of the equivalent circuits. [16]
3. (a) Derive the Torque equation for moving iron instruments.
(b) The inductance of a moving iron instrument is given by L = (0.01 + Bθ)2 mH, Where θ is the deflection from zero position in degrees . The angular deflection of the instrument corresponding to 1.5 A and 2A respectively is 900and 1200.
Find the value of B. [8+8]
4. (a) In a 120V compound generator, the resistance of armature shunt and series winding are 0.06Ω , 25Ω & 0.04Ω respectively. The load current is 100A at 120V. Find the induced emf and the armature current when the machine is connected as
(i) long shunt
(ii) short shunt.
(b) How will the ampere turns of the series field be changed if diverters of 0.1 Ω be connected in parallel with the series field winding? Neglect brush contact drop and ignore armature reaction. [16]
5. (a) With a neat sketch, explain the operation of three point starter.
(b) If the load is removed from a D.C series motor, what will happen? [8+8]
6. (a) State and Explain Faraday's laws of electromagnetic induction. Distinguish
between self induced and mutually induced voltage.
(b) Determine the resistance across the terminals 'a and b' of the interconnected resistors
shown in the figure 1b. [8+8]
3
Code No: R05311801 R05 Set No. 4
Figure 1b
7. (a) Discuss the construction and principle of operation of a 3-phase Synchronous
Generator.
(b) A 3-phase, 4-pole, 50-Hz, star-connected alternator has 60 slots with 2 con- ductors per slot and having armature winding of the double layer type. Coils are short-pitched, that is, if one coil side lies in slot number 1, the other coil side lies in slot number 13. Find the useful flux per pole required to induce a line voltage of 6.6 kV. [8+8]
8. (a) How do you classify induction motors. Give the constructional details of them.
(b) A 3-Φ Induction motor with R2
2
= 0.5 has a starting torque of 25N-m for
negligible stator impedence and no load current. Determine the starting torque
when the rotor circuit resistance per phase is i. doubled
ii. halved. [6+10]
? ? ? ? ?
4
Code No: R05311801 R05 Set No. 1
III B.Tech I Semester Supplementary Examinations,June 2010
ELECTRICAL ENGINEERING Metallurgy And Material Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) State and Explain Faraday's laws of electromagnetic induction. Distinguish
between self induced and mutually induced voltage.
(b) Determine the resistance across the terminals 'a and b' of the interconnected resistors
shown in the figure 1b. [8+8]
Figure 1b
2. (a) With a neat sketch, explain the operation of three point starter.
(b) If the load is removed from a D.C series motor, what will happen? [8+8]
3. (a) In a 120V compound generator, the resistance of armature shunt and series winding are 0.06Ω , 25Ω & 0.04Ω respectively. The load current is 100A at 120V find the induced emf and the armature current when the machine is connected as
(i) long shunt
(ii) short shunt.
(b) How will the ampere turns of the series field be changed if diverters of 0.1 Ω be connected in parallel with the series field winding? Neglect brush contact drop and ignore armature reaction. [16]
4. (a) Discuss the construction and principle of operation of a 3-phase Synchronous
Generator.
(b) A 3-phase, 4-pole, 50-Hz, star-connected alternator has 60 slots with 2 con- ductors per slot and having armature winding of the double layer type. Coils are short-pitched, that is, if one coil side lies in slot number 1, the other coil side lies in slot number 13. Find the useful flux per pole required to induce a line voltage of 6.6 kV. [8+8]
5. (a) How do you classify induction motors. Give the constructional details of them.
5
Code No: R05311801 R05 Set No. 1
(b) A 3-Φ Induction motor with R2
2
= 0.5 has a starting torque of 25N-m for
negligible stator impedence and no load current. Determine the starting torque
when the rotor circuit resistance per phase is i. doubled
ii. halved. [6+10]
6. Describe the exact and approximate equivalent circuit of a single phase transformer.
Also describe experiments to obtain the parameters of the equivalent circuits. [16]
7. (a) Derive the Torque equation for moving iron instruments.
(b) The inductance of a moving iron instrument is given by L = (0.01 + Bθ)2 mH, Where θ is the deflection from zero position in degrees . The angular deflection of the instrument corresponding to 1.5 A and 2A respectively is 900and 1200 .
Find the value of B. [8+8]
8. (a) For a series resonance circuit, obtain the expression for bandwidth in terms of resonant frequency and quality factor.
(b) A balanced 3-phase, delta connected load of (2+j3) Ω/phase is connected to a balanced 3-phase, 440V supply. The phase current is 10A. Find total active power, reactive power and total apparent power in the circuit. [8+8]
? ? ? ? ?
6
Code No: R05311801 R05 Set No. 3
III B.Tech I Semester Supplementary Examinations,June 2010
ELECTRICAL ENGINEERING Metallurgy And Material Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) State and Explain Faraday's laws of electromagnetic induction. Distinguish between self induced and mutually induced voltage.
(b) Determine the resistance across the terminals 'a and b' of the interconnected resistors shown in the figure 1b. [8+8]
Figure 1b
2. (a) Derive the Torque equation for moving iron instruments.
(b) The inductance of a moving iron instrument is given by L = (0.01 + Bθ)2 mH, Where θ is the deflection from zero position in degrees . The angular deflection of the instrument corresponding to 1.5 A and 2A respectively is 900and 1200.
Find the value of B. [8+8]
3. Describe the exact and approximate equivalent circuit of a single phase transformer.
Also describe experiments to obtain the parameters of the equivalent circuits. [16]
4. (a) For a series resonance circuit, obtain the expression for bandwidth in terms of
resonant frequency and quality factor.
(b) A balanced 3-phase, delta connected load of (2+j3) Ω/phase is connected to a balanced 3-phase, 440V supply. The phase current is 10A. Find total active power, reactive power and total apparent power in the circuit. [8+8]
5. (a) How do you classify induction motors. Give the constructional details of them.
(b) A 3-Φ Induction motor with R2
2
= 0.5 has a starting torque of 25N-m for
negligible stator impedence and no load current. Determine the starting torque
when the rotor circuit resistance per phase is
i. doubled
ii. halved. [6+10]
7
Code No: R05311801 R05 Set No. 3
6. (a) Discuss the construction and principle of operation of a 3-phase Synchronous
Generator.
(b) A 3-phase, 4-pole, 50-Hz, star-connected alternator has 60 slots with 2 con- ductors per slot and having armature winding of the double layer type. Coils are short-pitched, that is, if one coil side lies in slot number 1, the other coil side lies in slot number 13. Find the useful flux per pole required to induce a line voltage of 6.6 kV. [8+8]
7. (a) In a 120V compound generator, the resistance of armature shunt and series winding are 0.06Ω , 25Ω & 0.04Ω respectively. The load current is 100A at 120V find the induced emf and the armature current when the machine is connected as
(i) long shunt
(ii) short shunt.
(b) How will the ampere turns of the series field be changed if diverters of 0.1 Ω be connected in parallel with the series field winding? Neglect brush contact drop and ignore armature reaction. [16]
8. (a) With a neat sketch, explain the operation of three point starter.
(b) If the load is removed from a D.C series motor, what will happen
No comments:
Post a Comment