Exam Board: Government Polytechnic
Question Paper Course: Diploma Hospital Management
Subject of Question Paper: Electrical Machines - II
Time allotted: 3 Hours
Max. Marks: 70
Year of the exam paper: 2010
Question Paper Format: Text
Q.1 (a) Explain how a rotating magnetic field is produced when a three phase supply is given to three phase winding. 07
(b) Explain the construction of three phase slip ring induction motor with the help of neat diagram. Label the ports. 07
Q.2 (a) Why starter is required to start three phase induction motor? State different types of starter used and explain any one of them. 07
(b) State different methods of speed control of three phase induction motor. Explain any one of them.
07
OR
(b) A 6 pole three phase 440 V, 50 Hz. Induction motor develops 8 H.P. at 955 rpm, stator losses amount to 400 watts and the friction losses 0.5 H.P., Calculate (i) rotor copper loss (ii) efficiency of motor. 07
Q.3 (a) Why single phase motor is not self starting? State different method to make itself start and explain any one of them. 07
(b) Explain with the help of diagram two field revolving theory applied to single phase winding. 07
OR
Q.3 (a) State the types of altenator. Derive the e.m.f. equation of alternator. 07
(b) A 6 pole, 3 phase 50 Hz. Star connected alternator has 12 slots per pole and 4 conductors per slot. The flux of 25 MWb enters the armature from each north pole. Calculate the e.m.f. induced in the alternator. The coil span is 1 to 10 and the distribution factor is 0.966. [07 marks]
Q.4 (a) Define the voltage regulation of an alternator. State different method to determine voltage regulation of an alternator and explain any one of them. 07
(b) Derive the formula of coil span factor and distribution factor related to three phase A.C. armature winding. 07
OR
Q. 4 (a) Why three phase synchronous motor is not self starting? State the different method of starting synchronous motor and explain any one of them. 07
(b) Draw the vector diagram of synchronous motor on load at various power factor. Find the internal angle if the resistance per phase is 0.3 ohms and synchronous impedance per phase is 3 ohms. 07
Q.5 (a) Explain Universal motor and State its application 07
(b) Explain the construction and working of a Schrage motor. 07
Question Paper Course: Diploma Hospital Management
Subject of Question Paper: Electrical Machines - II
Time allotted: 3 Hours
Max. Marks: 70
Year of the exam paper: 2010
Question Paper Format: Text
Q.1 (a) Explain how a rotating magnetic field is produced when a three phase supply is given to three phase winding. 07
(b) Explain the construction of three phase slip ring induction motor with the help of neat diagram. Label the ports. 07
Q.2 (a) Why starter is required to start three phase induction motor? State different types of starter used and explain any one of them. 07
(b) State different methods of speed control of three phase induction motor. Explain any one of them.
07
OR
(b) A 6 pole three phase 440 V, 50 Hz. Induction motor develops 8 H.P. at 955 rpm, stator losses amount to 400 watts and the friction losses 0.5 H.P., Calculate (i) rotor copper loss (ii) efficiency of motor. 07
Q.3 (a) Why single phase motor is not self starting? State different method to make itself start and explain any one of them. 07
(b) Explain with the help of diagram two field revolving theory applied to single phase winding. 07
OR
Q.3 (a) State the types of altenator. Derive the e.m.f. equation of alternator. 07
(b) A 6 pole, 3 phase 50 Hz. Star connected alternator has 12 slots per pole and 4 conductors per slot. The flux of 25 MWb enters the armature from each north pole. Calculate the e.m.f. induced in the alternator. The coil span is 1 to 10 and the distribution factor is 0.966. [07 marks]
Q.4 (a) Define the voltage regulation of an alternator. State different method to determine voltage regulation of an alternator and explain any one of them. 07
(b) Derive the formula of coil span factor and distribution factor related to three phase A.C. armature winding. 07
OR
Q. 4 (a) Why three phase synchronous motor is not self starting? State the different method of starting synchronous motor and explain any one of them. 07
(b) Draw the vector diagram of synchronous motor on load at various power factor. Find the internal angle if the resistance per phase is 0.3 ohms and synchronous impedance per phase is 3 ohms. 07
Q.5 (a) Explain Universal motor and State its application 07
(b) Explain the construction and working of a Schrage motor. 07
![Lucknow University B.A./B.Sc. (Part-III) (Back Paper) MATHEMATICS [ Third Paper ] Numerical Analysis and Programming in C - 2018 Question Paper](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSRFF5B8mgwVKJswFbXFVMbYPkwZ5huZNYCbcvphN2nQ2jOctgxD-2OCGkKWECevFXYTdxUFbTDJhx7JzU880M-lNAV3yJhbPerY9N4OWHvh54NGmgoYOfAy9GWFzvBsiTMVcvjNuGYIs/s72-w640-c-h458/97+1.png "Lucknow University B.A./B.Sc. (Part-III) (Back Paper) MATHEMATICS [ Third Paper ] Numerical Analysis and Programming in C - 2018 Question Paper")
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