Q1. (a) With the aid of a circuit diagram explain the working of Bridge rectifier. (8)
(b) Compare the performance of Bridge rectifier with Full wave and Half wave rectifier. (8)
Q3. (a) Sketch, the circuit diagram of an instrument used for measuring electrical insulation resistance. (8)
(b) Describe the circuit diagram sketched in (a), explaining how it operates when measuring electrical insulation resistance. (8)
Q2. What are the condition for producing sustained oscillations? Classify oscillations with respect to frequency range, principle involved, etc. It is possible to produce oscillations with RC networks in phase shift oscillator. Discuss in detail. (16)
Q1. Differentiate between half and full wave rectification. State where half wave rectification may be used and the purpose for which it is not well adapted. Sketch a bridge connection by which full wave rectification may be obtained. (16)
Q2.a) Explain three methods of overcurrent protection for electrical circuit. (8)
b) Explain with aid of diagram, the meaning of the term inverse current time characteristic (8)
Q2. a) Describe the circuit breaker for an A.C. generator using a sketch to show how arcing is controlled. (8)
b) Explain the sequence of events that might occur if the breaker opens on a short circuit and state the check you would require following such event. (4)
c) Give a safe procedure to follow should a main circuit breaker fail to open under fault Condition. (4)
Username or email address *Required
Password *Required
Note: Entering wrong username in the login form will ban your IP address immediately. Entering wrong password multiple times will also ban your IP address temporarily.
Log in
Lost your password? Remember me
No account yet?
