University Questions with Answers (Long Answered Questions)

University Questions with Answers (Long Answered Questions)

(Regulation 2008)

May-11

Q.1 Explain 'V' and 'inverted 'V' curves of a synchronous motor. (Section 4.11) [8]

Q. 2 Draw and explain the phasor diagram of a cylindrical rotor synchronous motor operating at different power factors. (Section 4.12)   [8]

Q. 3 What is hunting ? State its causes. How it can be minimized ? Explain the use of damper winding in synchronous motor. (Section 4.17)    [8]

Q. 4 Explain how synchronous motor can be operated as a synchronous condensers. Draw a phasor diagram. (Section 4.19)         [12]

Dec.-ll

Q. 5 Explain the operation of synchronous motor at constant load variable excitation. (Section 4.10) [8]

Q. 6 Explain 'V' and 'inverted ’V' curves of a synchronous motor. (Section 4.11) [8] May-12

Q. 7 Why synchronous motors are not self starting ? Explain in detail. (Section 4.5) [8]

Q. 8 Explain the operation of synchronous motor at constant load variable excitation. (Section 4.10) [8]

Q. 9 Derive an expression for the maximum torque developed per phase of a synchronous motor. (Section 4.14)     [8]

Q.10 Explain how synchronous motor can be operated as a synchronous condensers. Draw a phasor diagram. (Section 4.19)         [12]

Dec.-12

Q. 11 Discuss the various methods of starting synchronous motor. (Section 4.7) [16]

Q. 12 Describe in detail about the effect of load change on load angle and power factor of a three phase synchronous motor operating on infinite bus bar and constant excitation. (Section 4.8)   [10] 

Q. 13 Discuss in detail how V curves are obtained for a synchronous motor. (Section 4.11) [8]

May-13     

Q. 14 Explain the effect of variable load with constant excitation on synchronous motor. (Section 4.8)         [6]

Q. 15 Explain the operation of synchronous motor at constant load variable excitation. (Section 4.10)       [8]

Q.16 Derive an expression for power delivered by a synchronous motor in terms of a load angle. (Section 4.14)      [8]

Q. 17 Derive the condition for maximum power and the value of maximum power for synchronous motor. (Section 4.14)   [6]

Dec.-13      

Q. 18 Explain 'V' and 'inverted 'V' curves of a synchronous motor. (Section 4.11 [8]

Q. 19 Draw and explain the phasor diagram of a cylindrical rotor synchronous motor operating at different power factors. (Section 4.12)      [8]

May-14     

Q. 20 Explain the operation of synchronous motor at constant load variable excitation. (Section 4.10)       [8]

Dec.-14      

Q. 21 Discuss the various methods of starting synchronous motor. (Section 4.7) [16]

Q. 22 Explain the constant excitation circles for synchronous motor. (Section 4.8, [5]

Q. 23 Explain 'V' and 'inverted 'V' curves of a synchronous motor. (Section 4.11, [8]

Q. 24 Explain constant power circle for synchronous motor. (Section 4.16)       [5]

(Regulation 2013)

Dec.-15      

Q. 25 Draw and explain the phasor diagram of a synchronous motor operating at lagging and leading power factor. (Section 4.12, [8]

Q. 26 Explain V and inverted V curves applied to synchronous motor. (Section 4.11)          [8]

Q. 27 Derive the expression for power delivered by a synchronous motor in terms of load angle (a). (Section 4.14) [8]

May-16

Q. 28 Explain in detail V and inverted V curves of a synchronous motor. (Refer sections 4.11)          [8]

Q. 29 Explain in detail the method of starting of synchronous motor. (Refer section 4.7)      [8]

Q. 30 Enumerate in detail the effect of varying excitation on armature current and power factor of synchronous motor. (Refer section 4.10)         [8]

Dec-16

Q. 31 Explain about the starting methods of synchronous motor. (Refer section 4.7) [16]

Q. 32 Draw the V and inverted V-curves and explain the effect of excitation on armature current and power factor of synchronous motor. (Refer sections 4.10 and 4.11) [16]

May-17

Q. 33 Explain V-curve and inverted V curve. (Refer section 4.11)   [8]

Q. 34 Derive the expression for power delivered by a synchronous motor in terms of load angle (a). (Refer section 4.14)  [8]

Dec-17

Q. 35 Describe the principle of operation of synchronous motor. (Refer section 4.4) [5]

Q. 36 What are the methods of starting a synchronous motor ? Explain any one of them with a circuit diagram. (Refer section 4.7)   [8]

Q.37 What are constant excitation circles and constant power circle’ for a synchronous motor ? How are they drived ? (Refer sections 4.8.4 and 4.16)         [8]

Q.38 Explain briefly how a synchronous motor can be operated as a synchronous condenser. (Refer section 4.19)        [5]

May-18

Q. 39 Explain the working of synchronous motor with different excitations. (Refer section 4.10) [13]