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Worksheets

ELECS 8

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Find the Thevenins impedance equivalent across R2 of a linear close circuit having 10 volt supply in series with two resistors (R1 = 50 ohms and R2 = 200 ohms).

a)

400 ohms

b)

40 ohms

c)

4 ohms

d)

4 k-ohms

2.

What is the process of converting multiple analog input signals sequentially to digital output?

a)

Time division multiplexing

b)

Analog to digital conversion

c)

Space division multiplexing

d)

Pulse code multiplexing

3.

What is the equivalent of decimal 15 in octal?

a)

15

b)

18

c)

17

d)

16

4.

________ is the transistor which fabricated as two complementary SCRs in parallel with common gate terminal.

a)

Triac

b)

Field effect transistor

c)

Bilateral SCR

d)

Unijunction transistor

5.

How many diodes will you use to have a basic half-wave rectifier?

a)

3

b)

4

c)

2

d)

1

6.

Electric charge of neutron is the same as

a)

proton

b)

electron

c)

current

d)

atom

7.

The current of an electric circuit is analogous to _________ parameter of a magnetic circuit.

A. flux density

a)

flux density

b)

reluctivity

c)

mmf

d)

flux

8.

Find the filter capacitor that will provide 2.5% ripple filtered voltage having a load of 120 mA, full wave rectified voltage of 36 V dc and 60 Hz supply.

a)

3117 microfarads

b)

3207 microfarads

c)

311.7 microfarads

d)

320.7 microfarads

9.

Which of the following solid state devices work on the phenomenon avalanche breakdown?

a)

Triac

b)

Unijunction

c)

All of these

d)

Light activated SCR

10.

_______ is unipolar semiconductor device which the current is carried by the majority carriers only.

a)

Field-effect transistor

b)

Point-contact transistor

c)

Zener diode

d)

Junction transistor

11.

_________ is a gate which has 2 or more low input signals to get low output.

a)

AND

b)

Inverter

c)

OR

d)

NAND

12.

The main reason for the variation of amplifier gain with frequency is

a)

due to inter-stage transformer

b)

the presence of capacitance both external and internal

c)

the logarithmic increases in its output

d)

the Miller effect

13.

Component of solar battery which uses light energy to produce electromagnetic force

a)

Alkaline cells

b)

Polymer cells

c)

Lithium cells

d)

Selenium cells

14.

What is the term called magnetic field?

a)

The force between the plates of a charged capacitor

b)

A force set up when current flows through a conductor

c)

Current flow through space around a permanent magnet

d)

The force that drives current through a resistor

15.

Find the voltage drop developed across D’Arsonval meter movement having an internal resistance of 1 k-ohm and full deflection current of 150 micro amp.

a)

150 kV

b)

150 mV

c)

150 V

d)

150 micro V

16.

Kind of AC-motor, light load high speed or high load low speed

a)

Synchronous motor

b)

Squirrel cage motor

c)

Split phase motor

d)

Universal motor

17.

One of the following can program bipolar PROMs.

a)

Biasing bipolar transistor

b)

Blowing fuse

c)

Enfusing input

d)

Charging a gate

18.

In order to maintain same secondary output voltage, a power supply which operate from either 120 V or 240 V ac lines must have primary winding:

a)

split exactly 1/3 from one end

b)

split exactly 1/4 from one end

c)

completely no split

d)

split exactly 1/2 from one end

19.

What is the counter that follows the binary sequence?

a)

Binary counter

b)

Simplex counter

c)

Shift counter

d)

Decimal counter

20.

_______ are non-semiconductor devices still used in digital memories.

a)

Gates

b)

Flip-flops

c)

Relay

d)

Magnetic cores

21.

What is the reference cycle time use in radar, when the signal is transmitted and back to receiver?

a)

10.1 microsec

b)

100.0 microsec

c)

12.4 microsec

d)

24.8 microsec

22.

Process in industrial electronics where electrons are emitted from the surface of certain metals when expose to the light is called

a)

photonics

b)

photosensitive

c)

phoovoltaic

d)

photoemission

23.

A FET can act as an excellent buffer amplifier because

a)

it has a low input impedance and high output impedance

b)

it has a very high voltage gain and low noise level

c)

it has a high input impedance and low output impedance

d)

smaller size, longer life and lower efficiency

e)

Eddy Currents

24.

What is the smallest element of a matter?

a)

Neutron

b)

Proton

c)

Atom

d)

Electron

25.

Refers to a pulse transmitter-receiver used in radio navigation and secondary surveillance radar to either a reply from transponder is called

a)

ILS

b)

Interrogator

c)

Outer maker

d)

Inner maker

26.

A triac behaves like two

a)

diodes in series

b)

resistors and one diode

c)

four-layer diodes in parallel

d)

inverse parallel connected SCRs with common gate

27.

________is called the flux density produced within, due to its own induced magnetism.

a)

Electromagnetic field intensity

b)

Magnetic field intensity

c)

Intensity of magnetization

d)

Electric field intensity

28.

The resonant circuit of a tuned-collector transistor oscillator has a resonant frequency of 5 MHz. If the value of capacitance is increased by 50%, calculate the new resonant frequency.

a)

3.33 MHz

b)

11.25 MHz

c)

2.6 MHz

d)

4.08 MHz

29.

The ability of a material to conduct magnetic flux through it refers to

a)

permittivity

b)

permeability

c)

reluctivity

d)

conductivity

30.

___________ is one factor that does not affect resistance.

a)

Cross sectional area

b)

Resistivity

c)

Mass

d)

Length

31.

Type of power line frequency meter device utilizing a principle of balancing an indicator needle at center at a scale using magnetic fields (resistive and inductive) opposing each other

a)

Magnetic type

b)

Resonant type

c)

Resistive type

d)

Electrodynamic type

32.

A measuring device or a meter made, so the pointer rests at the center of its scale zero current.

a)

Linear meter

b)

Galvanometer

c)

Digital meter

d)

Non-linear meter

33.

Part of the oscilloscope which produces bright spot through collection of electrons

a)

Focus control

b)

Heater cathode

c)

Aquadag coating

d)

Grid

34.

For a processor that uses 4-bit words, the largest number that can be represented using double precision is

a)

255

b)

15 (decimal)

c)

65,535

d)

127

35.

__________ refers to the class of logic circuit containing flip-flops.

a)

Combinational

b)

Sequential

c)

Linear

d)

Feedback

36.

How does junction diodes rated?

a)

Maximum reverse current and PIV

b)

Maximum forward current and PIV

c)

Maximum forward current and capacitance

d)

Maximum reverse current and capacitance

37.

What logic circuit is analogous to a single pole mechanical selector switch?

a)

Decoder

b)

Encoder

c)

Multiplexer

d)

Exclusive OR

38.

What do you call an electronic measuring equipment used in navigation which provides runway direction, distance and height guidance to permit blind landing?

a)

DME

b)

ODR

c)

TACAN

d)

ILS

39.

An encoder is an MSI (medium-scale-integration) circuit that

a)

provides an output code that corresponds to which a set of input line is true

b)

provides a storage of a certain number of binary bits

c)

selects a given output based on binary input code

d)

provides for delivering one of two or more inputs to an output

40.

In a high-fidelity system, the pair of filter which separate audio frequency band signals into two separate groups, one of which is fed to the tweeter and the other to the woofer is called

a)

matching transformer

b)

crossover network

c)

equalizer

d)

bridge network

41.

How long in nautical miles does the radar travel to and from at 12.4 microseconds?

a)

2 miles

b)

1 miles

c)

3 miles

d)

4 miles

42.

The ________ the Q of a circuit, the narrower is its bandwidth.

a)

lower

b)

higher

c)

broader

d)

selective

43.

Data selector is also called

a)

encoder

b)

decoder

c)

multiplexer

d)

demultiplexer

44.

The code 1011 in BCD is

a)

24

b)

letter A

c)

11

d)

invalid

45.

What is the equivalent of hexadecimal 1A in decimal?

a)

27

b)

26

c)

42

d)

40

46.

________ is the voltage applied in direct current circuit having a power of 36 watts and total resistance of 4 ohms.

a)

6 V

b)

9 V

c)

24 V

d)

12 V

47.

A two-pole, one phase motor has _______ field poles.

a)

8

b)

2

c)

6

d)

4

48.

_______ is a device used to store electrical energy in an electrostatic field?

a)

Inductor

b)

Battery

c)

Transformer

d)

Capacitor

49.

A memory circuit that has address inputs has how many storage locations?

a)

1024

b)

256

c)

512

d)

not determined by sets of input

50.

High sensitive DC voltmeter provides accurate reading when measuring _______ circuits.

a)

zero resistance

b)

low resistance

c)

at any resistance

d)

high resistance