Entry Test MCQ :: Electronics

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31.

In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is

A.	Equal to D.C. value	B.	More than D.C. value
C.	Less than D.C. value	D.	Zero

32.

To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is

A.	2	B.	3
C.	4	D.	5

33.

To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is

A.	2	B.	3
C.	4	D.	5

34.

The operation of a transistor requires

A.	That the emitter be heated	B.	That the base be heated
C.	That the collector be heated	D.	None of the above

35.

In forward bias the width of potential barrier

A.	Increases	B.	Decreases
C.	Remains same	D.	No effect

36.

The working of transistor as amplifier is similar to

A.	Step up transformer	B.	Step down transformer
C.	Three diodes in common	D.	Triode vacuum tube

37.

The electronic circuits which implement the various logic operations are called

A.	Logic gates	B.	Boolean algebra
C.	Amplifier gain	D.	Logic functions

38.

An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a _

A.	Non-inverting voltage at output	B.	Reference voltage on the other
C.	Virtual input	D.	Output

39.

An OP-AMPs can amplify

A.	D.C.	B.	A.C.
C.	Both A.C. & D.C.	D.	None of the above

40.

Non-inverting amplifier circuits have

A.	A very high input impedance	B.	A very low input impedance
C.	A low output impedance	D.	None of the above