1
GATE ECE 2017 Set 2
+1
-0.3
An npn bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base-collector junction is increased, then
A
the effective base width increases and common – emitter current gain increases
B
the effective base width increases and common – emitter current gain decreases
C
the effective base width decreases and common – emitter current gain increases
D
the effective base width decreases and common – emitter current gain decreases
2
GATE ECE 2017 Set 2
Numerical
+1
-0
Consider the circuit shown in the figure. Assume base-to-emitter voltage VBE=0.8 V and common base current gain $$\left(\alpha\right)$$ of the transistor is unity. The value of the collector-to–emitter voltage VCE (in volt) is _______.
3
GATE ECE 2017 Set 1
+1
-0.3
For a narrow base PNP BJT, the excess minority carrier concentration ($$\bigtriangleup n_E$$ for emitter, $$\bigtriangleup p_B$$ for base, $$\bigtriangleup n_E$$ for collector) normalized to equilibrium minority carrier concentration ($$\bigtriangleup n_{E0}$$ for emitter, $$\bigtriangleup p_{B0}$$ for base, $$\bigtriangleup n_{C0}$$ for collector) in the quasi-neutral emitter, base and collector regions are shown below. Which one of the following biasing modes is the transistor operating in?
A
Forward active
B
Saturation
C
Inverse active
D
Cutoff
4
GATE ECE 2016 Set 3
Numerical
+1
-0
The figure shows the I-V characteristics of a solar cell illuminated uniformly with solar light of power 100 mW/cm2. The solar cell has an area of 3 cm2 and a fill factor of 0.7. The maximum efficiency (in %) of the device is __________.
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