Thursday, May 15, 2014

Guess Paper 1st Branch Electrical Code: 306 Electrical Machine 2nd

Guess Paper 1st
Branch Electrical
Code: 306 Electrical Machine 2nd
First question is compulsory and attempt any 5 questions in rest off.
Q: 1 give the answer of following:                                                                                                    2*5=10
       A: what is the slip in induction motor?
       B: why alternator is rated in KVA?
       C:  what is the pitch factor?
       D: explain synchronous reactance?
       E: Why no load current is large in Induction motor from Transformer?

Q: 2 (A) Explain construction of slip ring and squirrel cage induction motor with clean diagram?  2*6=12
        (B) Explain torque slip characteristics of induction motor?

Q: 3 (A) Explain Construction, working principle and characteristics of capacitor start induction motor?
        (B) Explain Double revolving field theory?                                                                                2*6=12

Q: 4 (A) Explain Effect of variation in excitation and prime mover power on the performance of parallel                       connected alternators?                                                                                                      2*6=12
        (B)  Explain Synchronous motor operation at Constant input power and variable excitation ?

Q: 5 (A) Comparison of induction motor and synchronous motor?                                                   2*6=12
        (B) Drive Swing equation and swing curve?

Q: 6 (A) Explain Transient behavior of synchronous machine?                                                        2*6=12
        (B) Explain Basic principles, operation, characteristics and applications of Stepper motor?

Q: 7 (A) Explain Parallel operation of three phase alternators?                                                         2*6=12
        (B) Explain V - curves and inverted V- curves of synchronous machine?

Q: 8 give short notes of any 3:                                                                                                        3*4=12
        a. Synchronous condenser
        b. Cogging and crawling
        c. Double cage induction motor
        d. M and H constants
        e. Hunting phenomenon in synchronous machines


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