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From the output characteristic shown in ...

From the output characteristic shown in fig. calculate the value of current amplification factor of the transistor when `V_(CE)=2 V`.

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From the given characteristic, corresponding to `V_(CE)=2.0V`, note the collector current for two base current (say `50muA` and `200muA)`. The corresponding values of` I_c` are `3.0mA` and `9.0mA` respectively.
Then `DeltaI_c=9-3=6mA, DeltaI_b=200-50=150muA`
`:.` Current amplification factor, `beta_(ac)=(DeltaI_c)/(DeltaI_b)=(6mA)/(150muA)=40`
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