Recent questions and answers in Bipolar Junction Transistor

1 answer 69 views

What is the difference between BJT and FET?

answered Aug 15, 2018 in Bipolar Junction Transistor
1 answer 78 views

 If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

answered Jun 18, 2018 in Bipolar Junction Transistor
0 answers 46 views

A BJT’s voltage stand-off capability when the base current is zero (A) collector-emitter breakdown voltage (B) minimum collector-emitter voltage (C) collector-base breakdown voltage (D) emitter-base voltage

asked Jun 4, 2018 in Bipolar Junction Transistor
1 answer 15 views

In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit (1) All calculations done earlier have to be repeated (2) Replace all calculated voltages by reverse values (3) Replace all calculated currents by reverse values (4) Replace all calculated voltages and currents by reverse values 

answered May 28, 2018 in Bipolar Junction Transistor
2 answers 17 views

In BJT, the common emitter gain β is (A) desired to have large value (B) desired to have small value (C) desired to have moderate value (D) the value need not be controlled

answered May 21, 2018 in Bipolar Junction Transistor
2 answers 17 views

For the active mode BJT operation (A) Emitter Base Junction is Forward Biased and Collector Base Junction is Forward Biased (B) Emitter Base Junction is Reverse Biased and Collector Base Junction is Reverse Biased (C) Emitter Base Junction is Forward Biased and Collector Base Junction is Reverse Biased (D) Emitter Base Junction is Reverse Biased and Collector Base Junction is Forward Biased

answered May 21, 2018 in Bipolar Junction Transistor
2 answers 19 views

A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cut-off region (OFF state) or in the saturation region (ON state). In the ON state, for the BJT  (A) both the base-emitter and base-collector junctions are reverse biased (B) the base-emitter junction is reverse ... (C) the base-emitter junction is forward biased, and the base-collector junction is reverse biased (D) both the base-emitter and base-collector junctions are forward biased

answered May 21, 2018 in Bipolar Junction Transistor
0 answers 11 views

A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5 A without any ripple. The armature resistance is 2 Ohm. The converter is working from a 230 V, single-phase ac source with a firing angle of 30o . Under this operating condition, the speed of the motor will be  (A) 339 rpm (B) 359 rpm (C) 366 rpm (D) 386 rpm

asked May 18, 2018 in Bipolar Junction Transistor
1 answer 52 views

As compared to power MOSFET, a BJT has  (a) Lower switching losses but higher conduction losses (b) Higher switching losses and higher conduction losses (c) Higher switching losses but lower conduction losses (d) Lower switching losses and lower conduction losses. 

answered May 13, 2018 in Bipolar Junction Transistor
1 answer 14 views

What is an emitter follower BJT circuit ? (A) Common Collector Amplifier (B) Common Emitter Amplifier (C) Common Base Amplifier (D) None of the above

answered May 12, 2018 in Bipolar Junction Transistor
1 answer 19 views

In BJT circuits, bulk of the gain is provided by (A) CE configuration (B) CB configuration (C) CC configuration (D) It is not certain

answered May 12, 2018 in Bipolar Junction Transistor
0 answers 32 views

What is a BJT amplifier?

asked Mar 19, 2018 in Bipolar Junction Transistor
0 answers 21 views

How can BJT be used as an amplifier?

asked Mar 19, 2018 in Bipolar Junction Transistor
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