CET 2 Flashcards
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
B. 0.0019
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
D. 3.162
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
D. retentivity
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
A. all of these answers
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
D. lags the applied voltage
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
B. open-circuit voltage, series
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
B. Emitters
Which one of the following is not an
input or output of the 555 timer?
A. Threshold
B. Clock
C. Trigger
D. Reset
B. Clock
LEDs are based on the principle of
A. Forward bias
B. Electroluminescence
C. Electron-Hole recombination
D. Photon Sensitivity
B. Electroluminescence
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
C. accumulator
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
B. Straight ring counter
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
D. AND gate
How many terminals does a
programmable unijunction transistor
(PUT) have?
A. 4
B. 3
C. 1
D. 2
B. 3
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)
C. VNH = VOH(min)- VIH(min)
When the sound wave goes from air into
water, the quantity that remains
unchanged is its _____
A. frequency
B. wavelength
C. amplitude
D. speed
A. frequency
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
B. virtual
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
A. Coulomb’s Law
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
B. Illuminance
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
B. elastic potential energy
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
D. its frequency increases
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
C. transverse wave
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
C. 3Q
One Newton is equal to how many
pounds?
A. 2.2
B. 4.45
C. 0.225
D. 100,000
C. 0.225
The power sent down the line toward
the load is known as
A. reflected power
B. incident power
C. flat line
D. standing wave
B. incident power
The current and voltage along a properly
matched line are___‘_
A. resonant
B. reactive
C. reflective
D. flat
D. flat
For an ideal condition, SWR should be
A. one
B. zero
C. as low as possible
D. as high as possible
A. one
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
D. S=d
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
D. would not reflect at all
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
C. litz wire
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
C. First
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
B. having a narrowband RF amplifier
before the mixer
One of the following refers to an output
of a balanced modulator.
A. SSB
B. ISB
C. DSB
D. AM
C. DSB
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.
C. FM signals have a capture effect
characteristic.
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
D. the bandwidth of the tuned circuits
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
D. VSB
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
B. Unchanged
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
D. Lower bandwidth is required
