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EEE EKT 01 2015 Online Practice Test



Question #1
If x=a(cos t + t sin t), y=a(sin t – t cos t). The value of $ dy \over dx $ is
Options
1) cos t
2) sin t
3) tan t
4) sec2 t

Question #2
The area of three faces of a cuboid are in the ratio 2:3:4 and its volume is 9000 cm3. The length of the shortest edge is
Options
1) 15 cm
2) 30 cm
3) 20 cm
4) 60 cm
Question Skipped
Question #3
$ \int dx \over x logx $ is equal to
Options
1) log x+x+c
2) log(logx)+c
3) xlogx+c
4) $ logx \over x $ +c

Question #4
Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
Options
1) 8/2
2) 9/20
3) 8/15
4) 2/20

Question #5
In MKS system, we measure
Options
1) mass in kilogram
2) distance in meter
3) time in second
4) all of these

Question #6
When the separation between two charges is made four times, the force between them
Options
1) increases four times
2) decreases four times
3) increases sixteen times
4) decreases sixteen times

Question #7
Angles project true size only when the plane containing the angle and plane of projection are
Options
1) Aligned
2) Adjacent
3) Perpendicular
4) Parallel

Question #8
Tesla is a measure of
Options
1) magnetic flux density
2) electric flux density
3) magnetic potential
4) electric potential

Question #9
Admittance is reciprocal of
Options
1) susceptance
2) impedance
3) reactance
4) conductance

Question #10
_________is an active filter
Options
1) RC filter
2) notch filter
3) Butterworth filter
4) band pass filter

Question #11
For transmission line load matching over a range of frequencies, it is best to use a
Options
1) Balun
2) broadband directional coupler
3) double stub
4) single stub

Question #12
Emitter follower is used for
Options
1) reducing the gain
2) increasing the distortion
3) impedance matching
4) none of these

Question #13
Binary equivalent of (45)10 is
Options
1) (11101)2
2) (11110)2
3) (101101)2
4) (110101)2

Question #14
In Computer memory size K indicates Kilo, which is equal to
Options
1) 1000
2) 1024
3) 100
4) 10000

Question #15
An astable multivibrator has
Options
1) no stable state
2) one stable state
3) three stable states
4) two stable states

Question #16
An ideal Op Amp has
Options
1) infinite input and output impedance
2) very low input and output impedance
3) low input impedance and very high output impedance
4) infinite input impedance and zero output impedance

Question #17
An instruction used to set the carry flag in a computer can be classified as a
Options
1) data transfer instruction
2) arithmetic instruction
3) logical instruction
4) program control instruction

Question #18
An FET is a
Options
1) bipolar semiconductor device
2) unipolar semiconductor device
3) non semiconductor device
4) both (a) and (c)

Question #19
For Gunn diodes, semiconductor material preferred is
Options
1) Silicon
2) Germanium
3) Gallium Arsenide
4) all of these

Question #20
In a JFET drain current is maximum when VGS is
Options
1) zero
2) negative
3) positive
4) equal to Vp

Question #21
The output of Laser is
Options
1) Infrared
2) polarised
3) narrow beam
4) coherent

Question #22
As compared to a closed loop system an open loop system is
Options
1) more stable as well as more accurate
2) less stable as well as less accurate
3) more stable but less accurate
4) less stable but more accurate

Question #23
Transfer function of a system is used to calculate
Options
1) the steady state gain
2) the time constant
3) the order of the system
4) the output for a given input

Question #24
In a closed loop control system
Options
1) control action depends upon the output and also on the input command
2) output signal is fed back to be compared with the reference signal
3) the accuracy is better than in the open loop system
4) all of the above

Question #25
The difference of the reference input and the actual output signal is called
Options
1) error signal
2) controlling signal
3) actuating signal
4) transfer function

Question #26
If the transfer function of a system is $ 1 \over Ts+1$,the steady state error to unit step input is
Options
1) T
2) zero
3) infinite
4) none of these

Question #27
In a PID controller,the values of proportional, integral and derivative are dependent on
Options
1) future, past and present errors respectively
2) present, past and future errors respectively
3) past, present and future errors respectively
4) present, future and past errors respectively

Question #28
The inverse Laplace transform of $2 \over s+1$ is
Options
1) 2(t+1)
2) 2e-t
3) 2et
4) 2e-2t

Question #29
The signal is extended from 96KHz to 100KHz, so the minimum sampling frequency required is
Options
1) 8KHz
2) 200KHz
3) 4KHz
4) 100KHz
Question Skipped
Question #30
A differentiation circuit has a
Options
1) very high time constant
2) very low time constant
3) infinite time constant
4) zero time constant

Question #31
Ideally Voltage Standing Wave Ratio (VSWR) should be
Options
1) as large as possible
2) as small as possible
3) as close to unity as possible
4) infinity

Question #32
Following is/are a property/properties of quantization
Options
1) it is an nonlinear process
2) it is an irreversible process
3) it maps a larger set of input values to a smaller set
4) all of these

Question #33
Most commonly used filter in SSB generation are
Options
1) mechanical filters
2) RC filters
3) LC filters
4) low pass filters

Question #34
If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be increased by a factor of
Options
1) 2
2) 4
3) 8
4) 16

Question #35
Following type of multiplexing cannot be used for analog signalling
Options
1) FDM
2) TDM
3) CDM
4) None of these

Question #36
In TDM systems, channel separation is done with the use of
Options
1) AND gates
2) band-pass filters
3) differentiator circuit
4) integrator circuit

Question #37
Data-link layer of the OSI model specifies
Options
1) data link procedures that provide for the exchange of data via frames that can be sent and received
2) the interface between the X.25 network and packet mode device
3) the virtual circuit interface to packet-switched service
4) all of the above

Question #38
FDDI is a
Options
1) ring network
2) star network
3) mesh network
4) bus based network

Question #39
Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?
Options
1) UDP
2) VMTP
3) X.25
4) SMTP

Question #40
The main difference between synchronous and asynchronous transmission is that
Options
1) the clocking is derived from the data in synchronous transmission
2) the clocking is mixed with the data in asynchronous transmission
3) the pulse height is different
4) the bandwidth required is different

Question #41
Transducer is a device which
Options
1) converts one form of power in to the other
2) is similar to transformer
3) converts one form of energy in to other
4) helps in measuring electricity

Question #42
Principle of hysteresis is not used in
Options
1) electrical water geyser
2) electrical motor
3) multi-vibrators
4) Schmitt trigger

Question #43
Which of the following motors would not be suitable for use as servomotors?
Options
1) AC induction motor
2) brushless AC motor
3) stepper motor
4) permanent magnet DC motor

Question #44
The stator of an induction motor is made of
Options
1) carbon
2) wood
3) copper stampings
4) silicon steel laminators

Question #45
An ideal DC generator is one that has _____ voltage regulation
Options
1) low
2) high
3) zero
4) positive

Question #46
Commutator is used in
Options
1) DC generator
2) AC generator
3) invertors
4) convertors

Question #47
The projection of a vector on another vector is
Options
1) scalar
2) vector
3) neither vector nor scalar
4) either scalar or vector

Question #48
When a conductor cuts magnetic flux, an emf is induced in the conductor. This is known as
Options
1) Joule's law
2) Faraday's law
3) Coulomb's law
4) Ampere's law

Question #49
X-rays are used for the study of crystal structure because
Options
1) X-rays are completely absorbed by the crystal
2) the wavelength of X-ray is of the same order of magnitude in the inter-atomic spacing in crystals
3) the wavelength of X-rays is very small in comparison with the inter-atomic spacing in crystals
4) the crystals are completely transparent to X-rays

Question #50
A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier?
Options
1) 600 g
2) 1000 g
3) 1250 g
4) 2000 g
Question Skipped

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