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EKT Mock Test for Electronics and Electrical stream



Question #1
An atom's atomic number is determined by the number of
Options
1) neutrons minus protons
2) protons
3) electrons
4) neutrons

Question #2
Which resistive component is designed to be temperature sensitive?
Options
1) Thermistor
2) Rheostat
3) Potentiometer
4) Photoconductive cell

Question #3
Thevenin’s theorem is applied to networks with
Options
1) DC source only
2) AC source only
3) both AC & DC source
4) none of the above

Question #4
Which part of an atom has no electrical charge?
Options
1) Electron
2) Neutron
3) Proton
4) All of the above

Question #5
When parallel resistors are of three different values, which has the greatest power loss?
Options
1) The smallest resistance
2) The largest resistance
3) They have the same power loss.
4) Voltage and resistance values are needed

Question #6
If the voltage across a fixed value of resistance is increased five times, what does the current do?
Options
1) It increases by a factor of five.
2) It decreases by a factor of five.
3) It stays the same.
4) none of the above

Question #7
Most practical alternators generate electricity from
Options
1) a coil rotating within a magnetic field
2) a magnetic field rotating around fixed windings
3) a permanent magnet rotating within a varying electromagnetic field
4) none of the above

Question #8
A rectangular wave that has a duty cycle of 50% could be called a
Options
1) "c" wave
2) sawtooth wave
3) square wave
4) triangular wave

Question #9
As frequency increases
Options
1) both series and parallel RL impedance decrease
2) series RL impedance decreases and parallel RL impedance increases
3) series RL impedance increases and parallel RL impedance decreases
4) both series and parallel RL impedance increase

Question #10
Which of the following statements is true about a lag network?
Options
1) An increase in frequency causes an increase in phase lag.
2) An increase in frequency causes an increase in the magnitude of the output voltage.
3) A decrease in frequency causes an increase in phase lag.
4) A decrease in frequency causes a decrease in the magnitude of the output voltage.

Question #11
The center frequency of a band-pass filter is always equal to the
Options
1) bandwidth
2) –3 dB frequency
3) bandwidth divided by Q
4) geometric average of the critical frequencies

Question #12
A zero-level detector is a
Options
1) comparator with a sine-wave output
2) comparator with a trip point referenced to zero
3) peak detector
4) limiter
Question Skipped
Question #13
The Shannon’s Theorem sets limit on the
Options
1) highest frequency that may be sent over channel
2) maximum capacity of a channel with a given noise level
3) maximum number coding levels in a channel
4) maximum number of quantizing levels in a channel
Question Skipped
Question #14
When transistors are used in digital circuits they usually operate in the
Options
1) active region
2) breakdown region
3) saturation and cutoff regions
4) linear region

Question #15
In a C-E configuration, an emitter resistor is used for:
Options
1) stabilization
2) ac signal bypass
3) collector bias
4) higher gain

Question #16
The C-B configuration is used to provide which type of gain?
Options
1) voltage
2) current
3) resistance
4) power
Question Skipped
Question #17
What does a hall effect sensor sense?
Options
1) temperature
2) moisture
3) magnetic fields
4) pressure

Question #18
Maxwell’s electromagnetic equations are valid under all conditions except one that is
Options
1) they do not apply to non-isotropic media
2) they do not apply to non-homogeneous media
3) they do not apply to media which move with respect to system coordinates
4) they do not apply to non-linear-media

Question #19
What causes the piezoelectric effect?
Options
1) heat or dissimilar metals
2) pressure on a crystal
3) water running on iron
4) a magnetic field

Question #20
The difference between a PLA and a PAL is:
Options
1) the PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane
2) the PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane
3) the PAL has more possible product terms than the PLA
4) PALs and PLAs are the same thing.

Question #21
After which time constant can a capacitor be considered to be fully charged?
Options
1) first
2) third
3) fifth
4) seventh

Question #22
Given a carrier frequency of 100 KHz and a modulating frequency of 5KHz, the bandwidth of AM transmission is
Options
1) 5KHz
2) 200KHz
3) 10KHz
4) 20KHz

Question #23
To increase the time constant of an RC circuit you will
Options
1) add a resistor in parallel with the circuit resistance
2) add a capacitor in parallel with the circuit capacitance
3) increase the amplitude of the input voltage
4) exchange the position of the resistor and capacitor in the circuit
Question Skipped
Question #24
Which of the following best describes nonvolatile memory?
Options
1) memory that retains stored information when electrical power is removed
2) memory that loses stored information when electrical power is removed
3) magnetic memory
4) nonmagnetic memory

Question #25
Which of the following memories uses a MOSFET and a capacitor as its memory cell?
Options
1) SRAM
2) DRAM
3) ROM
4) DROM

Question #26
Which bus is bidirectional?
Options
1) data bus
2) control bus
3) address bus
4) multiplexed bus

Question #27
In a modulation system, if modulating frequency is doubled, the modulation index also becomes double, the system is
Options
1) FM
2) AM
3) PM
4) both FM and AM

Question #28
Exceptions to the 8085 microprocessor normal operation are called:
Options
1) jump instructions
2) decoding
3) interrupts
4) jump instructions or interrupts

Question #29
What is a varistor?
Options
1) a voltage-dependent resistor
2) a voltage-dependent diode
3) a current-dependent resistor
4) a current-dependent diode

Question #30
Testing a good diode with an ohmmeter should indicate
Options
1) high resistance when forward or reverse biased
2) low resistance when forward or reverse biased
3) high resistance when reverse biased and low resistance when forward biased
4) high resistance when forward biased and low resistance when reverse biased

Question #31
Which electromagnetic device uses brushes and a commutator?
Options
1) A speaker
2) A dc generator
3) A relay
4) A solenoid

Question #32
When does maximum power transfer happen from the source to the load?
Options
1) When the source resistance is greater than the load resistance
2) When the source resistance is less than the load resistance
3) When there is negligible source resistance
4) When the source resistance equals the load resistance

Question #33
The bandwidth requirement of a telephone channel is
Options
1) 3KHz
2) 5KHz
3) 10KHz
4) 15KHz

Question #34
Increasing the number of turns of wire on the secondary of a transformer will
Options
1) increase the secondary current
2) decrease the secondary current
3) have no effect on the secondary current
4) increase the primary current

Question #35
A JFET
Options
1) is a current-controlled device
2) has a low input resistance
3) is a voltage-controlled device
4) is always forward-biased

Question #36
In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid
Options
1) crossover distortion
2) unusually high efficiency
3) negative feedback
4) a low input impedance
Question Skipped
Question #37
The primary function of the oscillator in an isolation amplifier is to
Options
1) convert dc to high-frequency ac
2) convert dc to low-frequency ac
3) rectify high-frequency ac to dc
4) produce dual-polarity dc voltages for the input to the demodulator
Question Skipped
Question #38
JFET terminal "legs" are connections to the drain, the gate, and the
Options
1) channel
2) source
3) substrate
4) cathode

Question #39
In which process where an input signal reduces the channel size
Options
1) enhancement
2) substrate connecting
3) gate charge
4) depletion

Question #40
In class A operation of an amplifier the current flows through the active device for
Options
1) whole of the input cycle
2) half of the input cycle
3) more than half of the input cycle
4) more than three fourth of the input cycle

Question #41
ASCII stands for
Options
1) American Serial Communication Interface
2) Additive Signal Coupling Interface
3) American Standard Code for Information Interchange
4) American Security Code for Information Interchange

Question #42
A single transistor can be used to build which of the following digital logic gates?
Options
1) AND gates
2) OR gates
3) NOT gates
4) NAND gates

Question #43
XOR logic gates can be constructed from what other logic gates?
Options
1) OR gates only
2) AND gates and NOT gates
3) AND gates, OR gates, and NOT gates
4) OR gates and NOT gates

Question #44
P Type Semiconductor material as a whole is
Options
1) positively charged
2) negatively charged
3) electrically neutral
4) dipole

Question #45
The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:
Options
1) increase ripple delay
2) add a 1 to complemented inputs
3) reduce propagation delay
4) determine sign and magnitude

Question #46
When both inputs of a J-K flip-flop cycle, the output will:
Options
1) be zero
2) not change
3) change
4) toggle

Question #47
An astable multivibrator is a circuit that
Options
1) has two stable states
2) is free-running
3) produces a continuous output signal
4) is free-running and produces a continuous output signal

Question #48
When an IC has two rows of parallel connecting pins, the device is referred to as
Options
1) a QFP
2) a DIP
3) a phase splitter
4) CMOS

Question #49
Rotation of a geosynchronous satellite means its
Options
1) drift from stationary position
2) wobbling
3) three-axis stabilization
4) three-dimensional stabilization
Question Skipped
Question #50
A geosynchronous satellite
Options
1) has the same period a that of the Earth
2) has a circular orbit
3) rotates in the equatorial plane
4) has all of the above

Question #51
Radio broadcasting is a familiar example of
Options
1) space multiplexing
2) time multiplexing
3) frequency multiplexing
4) none of the above
Question Skipped

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