SECTION 1: Mutiple-choice questions Note: Vp-Vn For this section each question c

Question

SECTION 1: Mutiple-choice questions Note: Vp-Vn For this section each question contibutes 1 mark 1. The JFET is (a) a unipolar device (b) a voltage-controlled device (c) a curent-controlled device (d) answers (a) and (c) (e) answers (a) and (b) 2. The channel of a JFET is between the (a) gate and drain (b) drain and source (c) gate and source (d) input and output 3. A JFET always operates with (a) the gate-to-source pa junction reverse-biased (b) the gate-to-source pa junction forward-biased (c) the drain connected to ground (d) the gate connected to the source 4. For VGS = 0 V, the drain current becomes constant when VDS exceeds (a) cutoff (b) VDO (c) vi, (d) o v 5. The constant-current region of a FET lies between (a) cutoff and saturation (b) cutoff and pinch-off (c) 0 and Ioss (d) pinch-off and breakdown 6. pss is (a) the drain current with the source shorted (b) the drain current at cutoff (c) the maximum possible drain current (d) the midpoint drain current

Explanation / Answer

1)

The JFET is uni-polar device and voltage controlled device

Option:   (e)

2)

Channel is formed between drain and source

Option : (b)

3)

JFET is always operates with Gate to source junction is reverse biased

Option : (a)

4)

Here drain current will be constant if drain to source voltage (VDS) exceeds the Pinch of voltage(Vp)

Option: (c)

5)

The constant current region happened after VDS exceeds the VP. This ref=gin in between pinch off and break down region

Option: (d)

6)

IDSS =Maximum drain to source current when VGS=0V.

Option : (C)

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