# Transistors – 1 – 4

16. In a transistor, if the base current is 1 mA and collector current is 2 mA, then :

(a) IE = 1 mA
(b) IE = 2 mA
(c) IE = 3 mA
(d) IE = 4 mA

Explanation
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17. The β value of a transistor can be determined from the curve plotted between :

(a) VBE and IE for constant VCE
(b) VBE and IC for constant VCE
(c) VCE and IE for constant IB
(d) VCE and IC for constant IB

Explanation
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18. The DC current gain of a transistor is :

(a) Always positive and greater than unity
(b) Always positive and less than unity
(c) Always positive and equal to unity
(d) Always positive and equal to infinity

Explanation
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19. The Collector to Base with Emitter open current, a transistor is extremely temperature dependent because :

(a) It is made up of free electrons and holes
(b) It is made up of thermally generated majority carrier
(c) It is made up of thermally generated minority carrier
(d) It is made up of free electrons alone

Explanation
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20. For N-P-N transistor the value of β in common base is 100. The value of current gain α in common emitter is –

(a) 0.99
(b) 0.92
(c) 1.01
(d) 0.95