# Multiple Choice Questions for Electronics Engineering Part 2

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Q.19 In a transistor

Emitter is heavily doped while the collector is moderately doped

Collector base junction is forward biased

Emitter is made wider than collector

The input resistance is much higher than output resistance

Answer: 1

Q.20 If a transistor were operated with emitter and collector interchanged, then

emitter current will increase

Collector current will increase

Base current will decrease

No current flow will take place

Answer: 2

Q.21 When a current flows in a conductor, the order of magnitude of the drift velocity of electrons in it is

IO

^{10}cm/s10

^{-2}cm/s10

^{4}cm/s10

^{-1}cm/s

Answer: 2

Q.22 When an alternating potential is applied to a capacitor, the current in the circuit will

lead the applied potential

lag the applied potential

be in phase with the applied potential

none

Answer: 1

Q.23 In application of superposition theorem, one is required to solve as many circuits as there are

Nodes

Branches

Meshes

Sources

Answer: 4

Q.24 Norton’s equivalent of a circuit consists of a

Constant current generator with parallel impedance

Constant current generator in series with an infinite resistance

Constant current generator in series with high impedance

Constant current generator in series with high impedance

Answer: 1

Q.25 We require a resistor of 47 k Ω- with ± 10% tolerance. The sequence of colour band on this resistor would be

Yellow, violet, orange & silver

Yellow, brown, orange & silver

Yellow, violet, orange & gold

Yellow, violet, brown & gold

Answer: 1

Q.26 The high level language can be translated into machine language with the help of

Assembler

Stack pointer

Complier

Multiplexer

Answer: 3

Q.27 The Intel 8259 is a - chip programmable interrupt controller

Single

Double

Triple

All of the above

Answer: 1

Q.28 An analog voltage in the range of 0 to V volts into be converted into 3- bit digital output. It is divided into eight intervals. The top & the bottom intervals are V/14 & the middle six intervals are V/7. The maximum quantization error will be:

0

V

Answer: 3

Q.29 Frequency of oscillation of an AMV depends upon

RC values of the circuit

Collector load resistors

Transistor

Width of input pulse

Answer: 1

Q.30 Multivibrators can be used as:

Frequency dividers

Memory elements in computers

Square wave, saw tooth & pulse generators

All the above

Answer: 4

Q.31 The permeability of a diamagnetic material is

Zero

Less than 1

Equal to a

More than 1

Answer: 2

Q.32 The potential barrier at a P – N junction is due to

Majority carriers

Minority carriers

Both majority and minority carriers

Fixed donor and acceptor ions

Answer: 4

Q.33 These self-inductance of a circuit is defined as twice the work done against the induced e.m.f. on establishing unit current in the coil. If the current to be established in the coil is doubled, the work done against the induced e.m.f. will be

Doubled

Halved

four times

Quarter times

Answer: 3

Q.34 The drift velocity of free electrons in a conducting wire carrying a current I is V. If in a wire of the same metal, but of double the radius, the current be 21, then the drift velocity of electrons will be

V

4V

Answer: 2

Q.35 A commercial power supply has a voltage regulation of

1%

2.5%

3.20%

4.50%

Answer: 1