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GATE 1991 : Electrical Engineering

7 pages, 46 questions, 3 questions with responses, 4 total responses,    0    0
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1991 1.12 The operating state that distinguishes a silicon controlled rectifier (SCR) from a diode is (a) forward conduction state (c) reverse conduction state 3.2. (d) (b) forward blocking state reverse blocking state Match the functions of the following protective elements in SCR applications: SCR rating (A) di/dt limit (P) snubber (B) d /dt limit (Q) heat sink (C) i 2t limit (R) series reactor (D) junction temperature limit 8. Protective element (S) to avoid runway speeds on no-load Figure shows the circuit schematic of a chopper driven, separately excited d.c. motor. The single-pole double-throw switch operates with a switching period (TON Ts ) is 0.2. The motor may be assumed lossless, with an armature inductance of 10 mH. The motor draws an average current of 20A at a constant back emf of 80 V, under steady state. TON S S TOFF ia 400V TON+TOFF=TS (a) Sketch and label the voltage waveform 0 ( t ) of the chopper for one switching period. (b) Sketch and label the motor current ia ( t ) for one switching period. (c) Evaluate the peak-to-peak current ripple of the motor.

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