२०७४/०४/१४
Full Marks: 100
Multiple Choice Question
Q1. The following unit is used to supervise each instruction in the CPU
Q1. The following unit is used to supervise each instruction in the CPU
A)
Control logic unit
B) Accumulator
C) ALU
D) Control register
B) Accumulator
C) ALU
D) Control register
Ans:
Q2. When a capacitor was connected to the
terminal of ohmmeter, the pointer indicated a low resistance initially and then
slowly came to infinity position. This shows that capacitor is
(a)
Short-circuited (b) all right (c) faulty (d) None of the
Ans:
b
Q3. What device is used to measure the very
high insulation resistance of electric cables?
A)
High resistance voltmeter
B) Moving iron vane meter
C) Megger
D) Multimeter
B) Moving iron vane meter
C) Megger
D) Multimeter
Ans:
C
Q4. In a balanced Wheatstone bridge, across
the center of the bridge there is
a) No current flow
b) No voltage is present at either end
c) Current always flows in one direction only
d) Current and voltage are at a new maximum
b) No voltage is present at either end
c) Current always flows in one direction only
d) Current and voltage are at a new maximum
Ans: a
Q5. When an AC current of
5A and dc current of 5A flow simultaneously through a circuit then which of the
following statement is true?
a) An ac ammeter will read
less than 10A but more than 5A
b) An ac ammeter will read only 5A
c) A dc ammeter will read 10A
d) A dc ammeter will read zero
Ans: - An ac ammeter will read less than
10A but more than 5A
Q6. Which of the following is correct in
reference to electrical resistance?
a) Two electrical
devices will have the same combined resistance if they are connected in series
as they will have if connected in parallel
b) If one of three
bulbs in a parallel lightening circuit is remove, the total resistance of the circuit will become greater
c) An electrical
device that has a high resistance will use more power than one with a low resistance with the same applied voltage
d) A 50 Ohm resister
in a 12 volt circuit will use less than a 10 Ohm resister in a 24 volt circuit
Ans:
Ans:
Q7.
The voltage output of an alternator may be regulated by controlling the
a. speed of the alternator.
b. voltage output of the dc exciter.
c. resistance in the rotor windings.
Ans: b
~
The voltage output of an AC alternator is determined by the amount of current
flowing in its exciter field. The alternator output voltage may be controlled
by varying the output voltage of the DC exciter.
Q8. An SCR combines the features of …………..
a.
A
rectifier and resistance
b.
A
rectifier and transistor
c.
A
rectifier and capacitor
d.
None
of the above
Ans: d
Q9. The first law of thermodynamics is the
law of
Ans:
Q10. When a drawing is amended which does not
affect interchangeability, the
Ans: The usual practice when a drawing is changed is to re-issue it with a new revision number.
Q11. Management is defined as
Q12. Execution of a quality plan should be
the responsibility of
Ans: All quality plans are controlled by management and the quality of the project is the main responsibility of project managers.
Q13. Which of the following is NOT an objective of MIS?
A) Facilitate the decisions-making process
B) Provide requisite information at each
level of management
C) Support decision-making
D) Recruit people for system
Answers: D)
Q14.
the following can be
considered to measure quality
a. Customer
satisfaction
b. Defects
c. Rework
d. All
of the above
e. None of the
above
Ans: d
Q15.
which of the following
statement is false in the context of quality assurance and quality control
Quality
control is focused on fulfilling quality requirements, whereas quality
assurance is focused on providing confidence that quality requirements are
fulfilled.
Q16. Indicate
which of the following pulse modulation systems is analog
A.
PCM
B.
PWM
C.
Differential PCM
D.
Delta
Q17.
fragmenting in the uhf
range normally propagate by means of
a) Ground waves
(b) sky waves
(c) surface waves
(d) space waves.
Answers. (d)
Q18.
in a class c amplifier
with sinusoidal input signal, the output current flows for
Q19.
linear diode detector
utilizes
A.
|
linear
portion of static characteristics of diode
|
B.
|
linear
portion of dynamic characteristic of diode
|
C.
|
square
law portion of dynamic characteristics of diode
|
D.
|
rectification
property of diode
|
Answer: D
Q20.
for a silicon
transistor to conduct
A transistor will not conduct (that is, no current
will flow through from the collector to the emitter) unless there is a also
potential difference between the emitter and the base of at least 0.6 V
Q21. Bleeder resistor in power supplies
is used to place
Q22. Radio Horizon: The radio horizon for space
waves is about four-thirds as far as the optical horizon. This beneficial
effect is caused by the varying density of the atmosphere, and because of
diffraction around the curvature of the earth. It is given with good
approximation, by the empirical formula dt=4 √ht where dt= distance (in km) from the transmitting antenna, ht = height (in m) of transmitting antenna
above the ground. The same formula applies to the receiving antenna.
Q23.
Waveguide acts as a high pass
filter in that most of the energy above a certain frequency (the cutoff
frequency) will pass through the waveguide, whereas most of the energy that is
below the cutoff frequency will be attenuated by the waveguide.
Q24.
The voltage standing wave has the
node and the current standing wave the anti node with
There is a voltage standing wave, as well
as current standing wave.
Both have exactly
the same shape, only that they are out of phase with each other to λ/4, ie at
one's voltage antinode,
corresponds a current node of
the other and vice versa.
Q25. VHF communication transmissions are
Q26. The directional characteristics of
combined vertical dipole and loop antenna arrangement is a
Some advantages
of optical fiber cables are
Q27. Directive gain is
Antenna gain is usually defined as the ratio
of the power produced by the antenna from a far-field source
on the antenna's beam axis to the power produced by a
hypothetical lossless isotropic antenna, which is equally sensitive to signals
from all directions.
Q28. When a wave travelling in air
enters into a wave guide
(A) The phase velocity will increase.
(B) The group velocity will increase.
(C) The phase velocity will decrease.
(D) None
Q29. The term critical
frequency denotes
|
||||||||
Answer: Option B
|
Q30. The three forces in a meter are
Q31. A galvanometer can be used for
measuring current and voltage of a circuit by
Q32. When used in a power supply the
function of a zener diode is to maintain constant
Q33. In
modern electronic multimeter, a FET or MOSFET is preferred over BJT because
Its
input resistance is high
Its
input resistance is high and does not change with range switch
Its
input resistance is low
It
is cheaper
Q34. The sensitivity
of a voltmeter is commonly expressed in ohms per
volt, which is the total resistance the sensitivity of a voltmeter is commonly
expressed in ohms per volt, which is the total resistance of the meter (r+rm)
divided by the full-scale reading.
Q35. To measure a resistance of about 8
ohms, we would use
Q36. A synchro is a electromagnetic transducer used to convert the angular
shaft position into electric signals.
Q37. Calibrated
airspeed (CAS) corrects the indicated airspeed for errors primarily resulting
from the position of the static source and, to a much lesser degree, from pitot
tube locations. The major errors are mainly due to differences in airflow over
the static port at varying angles of attack. The errors usually are greatest in
the low and high-speed ranges and smallest in normal op
Q38. A thyristor (silicon controlled
rectifier-scr)
Q39. The VHF communication band with
8.33 khz spacing produces
Q40. Which system on aircraft uses to
communicate with ground control?
A
larger answer is that ground
control and aircraft
communications were under major development for decades
before satellite communications were
available. The system we use today is heavily based on line-of-sight
VHF communication radio
over most populated areas.
Q41. After an automatic
direction finding antenna has been installed, the
~ When an automatic direction finder is installed on a particular type of aircraft for the first time, it is important that the loop antenna be checked for quadrantal error. Quadrantal error is the error caused by the metal in the aircraft structure distorting the electromagnetic field of the received signal. Quadrantal error causes azimuth inaccuracies, which are greatest between the four cardinal points with respect to the center line of the aircraft.
~ When an automatic direction finder is installed on a particular type of aircraft for the first time, it is important that the loop antenna be checked for quadrantal error. Quadrantal error is the error caused by the metal in the aircraft structure distorting the electromagnetic field of the received signal. Quadrantal error causes azimuth inaccuracies, which are greatest between the four cardinal points with respect to the center line of the aircraft.
a. antenna must be grounded.
*b. loop must be calibrated.
c. transceiver must be compensated.
*b. loop must be calibrated.
c. transceiver must be compensated.
Q42.
A DME antenna should be located in a
position on the aircraft that will
~ To prevent an interruption in DME operation, the antenna must be located in a position that will not be blanked by the wing when the aircraft is banked.
*a. not be blanked by the wing when the aircraft is banked.
b. permit interruptions in DME operation.
c. eliminate the possibility of the DME locking on a station.
~ To prevent an interruption in DME operation, the antenna must be located in a position that will not be blanked by the wing when the aircraft is banked.
*a. not be blanked by the wing when the aircraft is banked.
b. permit interruptions in DME operation.
c. eliminate the possibility of the DME locking on a station.
Q43. Which one of the
following is not correct?
(a)
Bus is a group of wires
(b) Bootstrap is a technique or device for loading first instruction
(c)
An instruction is a set of bits that defines a computer operation
(d)
An interrupt signal is required at the start of every programme
Q44. The working voltage of a capacitor is
The Working Voltage is another important capacitor
characteristic that defines the maximum continuous voltage either DC
or AC that can be applied to the capacitor without failure during
its working life.
Q45. To find the resonant frequency of a
circuit the following formula is used
Q46. Which symbol represents a variable
resistor
Q47. The boiling point of a given liquid
varies
A- directly with pressure.
B- inversely with pressure.
C- directly with density.
Q48. An isothermal process is one in
which
An isothermal process is one in which the temperature remains
constant.
Q49. An isometric projection is
Isometric
projection. Isometric (meaning “equal
measure”) is a type of parallel (axonometric) projection, where the X and Z axes
are inclined to the horizontal plane at the angle of 30⁰. The angle between axonometric axes equals 120⁰. 30/120/30 is also referred ti as true isometric grid.
Q50. Which of the following is not
considered a method of heat transfer
2076/02/07
Aircraft Maintenance /Avionics Group/ 7th Level/ Senior Technical Officer
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