CET 2

Question 1

A sample size of 10 is taken with results
given by: 7.07, 7.00,7.10, 6.97,7.00,
7.03,7.01,6.98,7.08,7.01. Calculate the
sample variance.

A. 0.0016
B. 0.0019
C. 0.0013
D. 0.0015

Answer 1

B. 0.0019

Question 2

A tire manufacturer wants to determine the inner diameter of a certain grade of tire. The data are as follows: 572, 572,573,568, 569, 575, 565, 570. Determine the sample standard deviation.

A. 8.75
B. 2.958
C. 10
D. 3.162

Answer 2

D. 3.162

Question 3

The ability of a material to remain
magnetized after removal of the
magnetizing force is known as

A. reluctance
B. permeability
C. hysteresis
D. retentivity

Answer 3

D. retentivity

Question 4

You are measuring the voltage at a
given point in a circuit that has very high
resistance values and the measured
voltage is a little lower than it should be
This is possibly because of

A. all of these answers
B. the source voltage is too low
C. one or more of the resistance values being
off
D. the loading effect of the voltmeter

Answer 4

A. all of these answers

Question 5

In a series RLC circuit that is operating
above the resonant frequency, the
current

A. is zero
B. leads the applied voltage
C. is in phase with the applied voltage
D. lags the applied voltage

Answer 5

D. lags the applied voltage

Question 6

By using Thevenin’s Theorem, a
complex two-terminal network may be simplified for solution by converting it into a simple circuit in which the so
called _ and the looking-back
resistance are connected in _ with
the load resistor.

A. short-circuit voltage, parallel
B. open-circuit voltage, series
C. short-circuit voltage, series
D. open-circuit voltage, parallel

Answer 6

B. open-circuit voltage, series

Question 7

In the differential amplifier circuit, which
of the following terminals are
connected together?

A. Bases
B. Emitters
C. One base to another collector
D. Collectors

Answer 7

B. Emitters

Question 8

Which one of the following is not an
input or output of the 555 timer?

A. Threshold
B. Clock
C. Trigger
D. Reset

Answer 8

B. Clock

Question 9

LEDs are based on the principle of

A. Forward bias
B. Electroluminescence
C. Electron-Hole recombination
D. Photon Sensitivity

Answer 9

B. Electroluminescence

Question 10

A register in the microprocessor that
keeps track of the answer or results of
any arithmetic or logic operation is the:

A. program counter
B. stack pointer
C. accumulator
D. instruction pointer

Answer 10

C. accumulator

Question 11

Which of the following is NOT the same
as a Johnson Counter?

A. Mobius counter
B. Straight ring counter
C. Walking ring counter
D. Twisted ring counter

Answer 11

B. Straight ring counter

Question 12

What logic gate is described by the truth
table in Fig. 10-15-09-C1?

(CET 2 TABLE)

A. NOR gate
B. NAND gate
C. OR gate
D. AND gate

Answer 12

D. AND gate

Question 13

How many terminals does a
programmable unijunction transistor
(PUT) have?

A. 4
B. 3
C. 1
D. 2

Answer 13

B. 3

Question 14

Which equation is correct?

A. VNL = VOH(min)- VIH(min)
B. VNH = VOH(min)+ VIH(min)
C. VNH = VOH(min)- VIH(min)
D. VNL = VIL(max)+ VOL(max)

Answer 14

C. VNH = VOH(min)- VIH(min)

Question 15

When the sound wave goes from air into
water, the quantity that remains
unchanged is its _____

A. frequency
B. wavelength
C. amplitude
D. speed

Answer 15

A. frequency

Question 16

An object closer to converging lens than its focal point always has an image that is______

A. inverted
B. virtual
C. smaller in size
D. the same in size

Answer 16

B. virtual

Question 17

According to this law, “The force
between two charges varies directly as
the magnitude of each charge and
inversely as the square of the distance
between them.”

A. Coulomb’s Law
B. Law of Universal Gravitation
C. Kepler’s Law
D. Newton’s Law

Answer 17

A. Coulomb’s Law

Question 18

It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.

A. Luminous Intensity
B. Illuminance
C. Radiance
D. Candela

Answer 18

B. Illuminance

Question 19

The energy stored in s stretched elastic
material such as spring is

A. mechanical energy
B. elastic potential energy
C. internal energy
D. kinetic energy

Answer 19

B. elastic potential energy

Question 20

When the pitch of a note is raised,

A. its wavelength is increased
B. wavelength remains constant
C. its frequency decreases
D. its frequency increases

Answer 20

D. its frequency increases

Question 21

A wave in which the particles of the
material move up and down as the wave
goes from left to right is called:

A. longitudinal wave
B. standing wave
C. transverse wave
D. none of these choices

Answer 21

C. transverse wave

Question 22

Suppose that energy Q is required to
accelerate a car from rest to v,
neglecting friction. How much added energy would be required to increase the speed from v to 2v?

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

Answer 22

C. 3Q

Question 23

One Newton is equal to how many
pounds?

A. 2.2
B. 4.45
C. 0.225
D. 100,000

Answer 23

C. 0.225

Question 24

The power sent down the line toward
the load is known as

A. reflected power
B. incident power
C. flat line
D. standing wave

Answer 24

B. incident power

Question 25

The current and voltage along a properly matched line are___'_ A. resonant B. reactive C. reflective D. flat

Answer 25

D. flat

Question 26

For an ideal condition, SWR should be A. one B. zero C. as low as possible D. as high as possible

Answer 26

A. one

Question 27

The characteristic impedance of an open-wire balance line is determined from its physical structure S is the center-to-center distance of the conductors and d is the diameter of the conductor. At what condition is the characteristic impedance minimum? A. d=2S B. S=2d C. S>>d D. S=d

Answer 27

D. S=d

Question 28

When sending power down a transmission line, it is usually desirable that as much power as possible will be absorbed by the load and as little as possible will be reflected back to the source. A positive voltage pulse sent down a transmission line terminated with its characteristic impedance: A. would reflect as a negative pulse B. would reflect as a positive pulse C. would reflect as a positive pulse followed by a negative pulse D. would not reflect at all

Answer 28

D. would not reflect at all

Question 29

A type of cable used in electronics to carry alternating current, designed to reduce the skin effect and proximity effect losses in conductors used at frequencies up to about 1 MHz. A. solid wire B. feeder cable C. litz wire D. twisted pairs

Answer 29

C. litz wire

Question 30

Which symbol in radio signal emission designation is referred to type of modulation of the main barrier? A. Second B. Fourth C. First D. Third

Answer 30

C. First

Question 31

Image frequency is defined as any frequency other than the selected radio frequency carrier that, if allowed to enter a receiver and mix with local oscillator will produce a cross-product frequency that is equal to intermediate frequency. Image frequency problems would be reduced by: A. having a wideband RF amplifier after the mixer B. having a narrowband RF amplifier before the mixer C. having an IF amplifier with the proper shape factor D. none of these choices

Answer 31

B. having a narrowband RF amplifier before the mixer

Question 32

One of the following refers to an output of a balanced modulator. A. SSB B. ISB C. DSB D. AM

Answer 32

C. DSB

Question 33

Why are image frequencies somewhat less of a problem in FM receivers than they are in SSB or AM receivers? A. FM mixer stages are square-law devices B. FM receivers do not use the superheterodyne design C. FM signals have a capture effect characteristic. D. SSB uses less bandwidth than does FM.

Answer 33

C. FM signals have a capture effect characteristic.

Question 34

What determines the selectivity of a receiver? A. the frequency stability B. the gain of the amplifier C. the power handling capability D. the bandwidth of the tuned circuits

Answer 34

D. the bandwidth of the tuned circuits

Question 35

It is a form of amplitude modulation in which the carrier and one complete sideband is transmitted, but only part of the second sideband is transmitted. A. DSB B. SSBSC C. ISB D. VSB

Answer 35

D. VSB

Question 36

Thermal Noise is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage. If the value of a resistor creating thermal agitation noise is doubled. The noise power generated is therefore A. Quadrupled B. Unchanged C. Halved D. Doubled

Answer 36

B. Unchanged

Question 37

Amplitude Modulation (AM) is the process of changing the amplitude of a relatively high frequency carrier signal in proportion with the instantaneous value of the modulating signal (information) while Frequency Modulation (FM) is a system in which the amplitude of the carrier is kept constant, while its frequency and rate of change are varied by the modulating signal. Indicate which one of the following is not an advantage of FM over AM: A. better noise immunity is provided B. Less modulating power is required C. The transmitted power is more useful D. Lower bandwidth is required

Answer 37

D. Lower bandwidth is required