SOCIETY OF RIDE
JNTUK 4-1 MECHANICAL 2nd MID ONLINE BITS............................LAVAN KUMAR
I&CS
1. "A function of the controlled output, which is
compared with the reference input to obtain the actuating signal" is
called as :->Primary
feed back signal
2. "Any finite number of blocks that are series
connected my be algebraically combined by multiplying their transfer
function". This
statement is called as :->Blocks in cascades
3. "Applying the force to some elastic member and then
measuring the resulting deflection to measure The applied force" is used
in :-
>Proving ring
4. "The quality or condition characterizing a process
whose value is held constant by controller or is Changed according to certain
law" is
called as :->Controlled variable
5. A bellow system is used to measure temperature. The input
heat is q. Bellow expansion is x. Then the transfer function is :->x / q
6. A control system that has no connection between the
output and the input is known as :->Open - loop system
7. A high gauge factor leads to a _ _ _ _ _ _ _ _ _ _ _ _ _
_ :->Large change in resistance for a s mall Change in strain input
8. A metallic toothed roter having 60 teeth was mounted on a
shaft whose speed was to be determined. The,pulses produced in the inductive
type magnetic pickup were registered to be 3600 per second.
Estimate the speed. :->3600 rpm
9. A pendulum scale is a :->Mechanical transducer
10. A Prony brake dynamometer measures :->Engine brake
power
11. A signal established as a standard of comparison for a
feed back control system by virtue of its relation to command is called as
:->Set
point
12. A signal established as a standard of comparison for a
feed back control system by virtue of its relation to command is called as :-
>Reference input
13. A strain gauge is used to measure strain of 1
micro-strain. Its initial resistance is 120 ohms and change in resistance is
0.00024 _. What is
the gauge factor :->2
14. A strain gauge with a gauge factor 2 is sued to measure
a strain of 1 micro strain. The Corresponding resistance shown by the strain
gauge
is 0.00024 ohm. Then the initial resistance is equal to
:->120 ohms
15. A strain gauge with initial resistance of 120 _ and
gauge factor of 2 is used to measure strain. When the resistance change shown
by the
instrument is 0.00024 _. What is the strain. :->1 micro
strain
16. A unity feed back system is :->Closed loop feed back
system where the transfer function in feed back loop is unity
17. Absolute humidity refers to :->The amount of water
vapor actually present in the air
18. Acceleration pickups will be made to have :->High
undampe d natural frequency
19. Actuating signal is :->An algebra sum of the
reference input and the primary feed back
20. An algebraic sum of the reference input and the primary
feed back signal is called as :->Actuating signal
21. An input that is established or varied by some means
external to and independent o f the feed back Control system is called as :-
>Command
22. An instrument used to measure angular velocity of a
shaft either by registering the number of rotations during the period of
contact or by
indicating directly the number of rotations per minute is
called as :- >Tachometer
23. Any control system that operates on time basis of
:->Open-loop control system
24. Bakelite gauges used for 2000 C will be fixed to
components with :->Phenol resin cement
25. Chose the wrong statement :->The Prony brake is much
steadier in operation than the rope Brake dynamo meter
26. Command means :->An input that is established or
varied by some means external to and independent of the feed back control
system
27. Control systems is :->An assembly of devices and
components connected or related, so as to command, direct or regulate itself or
another system
28. Controlled medium means :->The process material in
the controlled system or flowing through it in which the variable is to be
controlled.
29. Controlled variable means :->The quality or condition
characterizing a process whose value is Held constant by controller or is
changed according to certain low.
30. Cradled source or cradled sink are the words associated
with :->Torque measure ment
31. Dew point temperature refers to :->Tempe rature whe
re the water vapor in the air starts condensing
32. Digital accelerometer is a :->Deflection type device
33. Direct output one can get from recording psychro meter
is :->Dry and wet bulb temperature
34. Direct output one can get from sling psychro meter is
:->Dry and wet bulb temperature
35. Dry bulb temperature refers to :->Te mperature of air
- wate r vapor mixture as indicated by a thermometer whose bulb is exposed
to the mixture
36. Dual gauge is :->A gauge which is built with two
different materials and inbuilt te mperature compensation
37. Dummy strain gauges :->Are bonded to separate
unstrained component and suffer resistance change due to temperature only
38. Electric cradled dynamo meter is a type of :->Driving
dynamo meter
39. For a electrical rheostat y is the input displacement
and q0 is the output. The transfer function = :->
40. For a power limit of 25,000 HP which dynamometer you
will suggest :->Water vertex dynamometer
41. For a speed limit of 10,000 rpm which dynamometer you
will suggest :->Water vertex dynamometer
42. For a spring mass dash pot system, input is x(t1 ),
output is f(t), k is spring stiffness, c is dash point Coefficient 'm' is the
mass the transfer
function is :->
43. For a strain gauge the gauge factor is 2 and the
resistance is 120 ohms. If the strain sensed is 2 micro strains.The change is
resistance = :-
>ohms
44. For a temperature control system 'q' in is heat input, θ
is temperature to be to maintained in the system is the ambient temperature, q
is
the leakage to the surroundings, R is the resistance and C
is the capacitance, then the input and output relations are written up :->
45. For a temperature range of 80 - 930 C, on can use a
:->Duco gauges
46. For a water turbine input is the flow of water (q)
flowing through the turbine. The output of the turbine speed is w. The transfer
function
is :->w / q
47. For many metals the resistivity :->Will not change
with strain
48. For most metallic strain gauges, most of the resistance
change comes from :->Change in length and area
49. For semiconductor gauges the change in resistance is due
to :->Change in resistivity
50. Froudes absorption dynamometer is a :->Vortex type
hydraulic dynamometers
51. Gauge using carrier material made with paper,
impregnated with nitro cellulose cement and bonded with cellulose constituents
are called
as :->Duco gauges
52. Gravimetric hygro meter is used to :->To calibrate
other humidity measuring devices
53. Greater lineaxity and lack of hysteresis is possible
with :->Servo accelerometer
54. Hydraulic dynamometer :->Use fluid friction for
dissipating the energy
55. Hygrometer is :->Instrument used to measure relative
humidity
56. In a differential angular potential mater one arm is set
at reference inclination θ1. The other arm inclination is θ0 . If 'e' is the
output
voltage then the transfer function is :->
57. In n type semi - conductor gauges resistance decrease
with :->Tensile Strain
58. In P type semi - conductor gauges resistance increases
with :->Tensile Strain
59. In Poisson's arrangement (one gauge perpendicular to
other) the bridge output when compared to quarter bridge output is :->(1 + μ
)
times
60. In the seismic mass type vibrometer the desirable
damping ratio is approximately :->65 %
61. In the seismic mass type vibrometer the influence of
damping ratio on seismic mass output for high values of w/wn :->Negligible
62. In the sesimic mass type vibrometer, when the frequency
ratio is considerably greater than one, the complitude ratio nears to _ _ _ _ _
_ _
_ _ _ _ _ _ _ :->Near to unity
63. Instrument used to help is measuring humidity is
:->Psychoro meter
64.is the change in output voltage of (Vs is excitation
voltage, F is gauge factor, E is strain) :->Quarter bridge
65.is the change in output voltage of (Vs is excitation
voltage, F is gauge factor, E is strain) :->Half bridge
66. Load limiting torque is :->Max possible torque which
a dynamometer can exert
67. Manipulated variable means :->The quality on
condition that is varied as a function of the Actuating signal so as to change
the
value of controlled variable.
68. Mark the Transmission dynamometer :->Flash light
torsion dynamometer
69. Mechanical strain gauges can measure :->Static and
quasi static strains
70. Mechanical strain gauges cannot be employed for
:->Dynamic strains
71. Mechanical torsion meter measures :->Twist on the
shaft
72. Negative feed back will _ _ _ _ _ _ _ _ _ _ _ the error
:->Reduce
73. Null - balance accelerometer have :->Feed back signal
74. On a strain gauge torsional meter :->Four gauges, two
gauges in torsion, two gauges in compressor
75. Out of the following gauges which one is having large
mass :->Unbonded
76. Out of the following instrument which can be used as
both vibrometer and accelerometer after doing some modifications. :->Sesimic
mass type
77. Out of the following instruments which can be used as
both vibrometer and accelerometer after doing some modifications. :->Seismic
mass type
78. Out of the following instruments which employs the
concept of resonance as the means of speed Measurement :->Vibrating Reed
Tachometer
79. Out of the following instruments which instrument has
highest speed range :->Slipping clutch tachometer
80. Out of the following instruments which instrument has
highest speed range :->Centrifugal force Tachometer
81. Out of the following instruments which occupies less
space for the same power :->Hydraulic dynamo meter
82. Out of the following instruments which one is
practically more valuable for general monitoring than for test work.
:->Vibrating Reed
Tachometer
83. Out of the following instruments, which instrument will
yield information about only amplitude of vibration :- >Wedge vibrometer
84. Out of the following speed measuring instruments which
one put less load on the machine whose speed is being measured :->Revolution
counter
85. Out of the following vibrating measuring instrument
which one will use 'resonance' as a means of measurement. :->Reed vibrometer
86. Out of the following which instrument you will recommend
for high frequency response in acceleration measurement :->Pie zo - electric
87. Out of the following which is contact less electrical
tachometer :->Photo electric Tacho meter
88. Out of the following which is contact less non
electrical Tacho meter :->Vibrating reed Tachometer
89. Out of the following which is not of the seismic mass
type transducer :->Reed vibrometer
90. Out of the following which is not the part of a seismic
transducers :->Reed
91. Out of the following, which one will not increase the
sensitivity of wheat stone bridge in strain measurement. :->Small excitation
voltage
92. Paper impregnated with phenolic resin used as a backup
material for gages to be used at :->2000 C
93. Positive feed back will _ _ _ _ _ _ _ _ _ the error
:->Increase
94. Power assisted steering in automobile is an example of
:->Servo mechanis m
95. Primary feed back signal means :->A function of the
controlled output, which is compared with the reference input to obtain the
actuating signal
96. Prony brake dynamometer :->Will absorb the powe r
i.e. being measured
97. Proving ring is a :->Mechanical transducer
98. Psychro meter is :->Instrume nt used to measure wet
bulb and dry bulb temperature
99. Ratio between humidity of air to the humidity of
saturated air is called as :->Relative humidity
100.Ratio of mass of water vapor to the mass of dry air in a
given volume of air-water vapor mixture
Is called as :->Specific humidity
101.Reed vibrator will yield information about
:->Frequency only
102.Reference input means :->A signal established as a
standard of comparison for a feed back control system by virtue of its relation
to command
103.Relative humidity refers to :->Ratio of humidity of
air with the humidity of saturated air
104.Relative output displacement of a sesimic mass
instrument is a not function of :->Mass
105.Set point means :->A signal established as a standard
of comparison for a feed back control system by virtue of its relation to
command
106.Simply turning the accelerometer upside down is
:->Constant acceleration method of calibration
107.Strain gauge accelerometer is a type of :->Seismic
mass type accelerometer
108.Stroboscope is used in :->Torsion measure ment
109.Stroboscopic method of vibration measurement will yield
the information about :->Frequency only
110.Tachometer are used to measure :->Angular velocity
111.Temperature at which the water vapor in the air starts
condensing is called as :->Dew point temperature
112.Temperature of air - water vapor mixture as indicated by
a thermometer whose bulb is e xposed to the mixture :->Dry bulb temperature
113.Temperature of air - water vapor mixture as registered
by a thermometer whose bulb is covered by a wick maintained continuously wet is
called as :->Wet bulb tempe rapture
114.The advantage of capacitive and inductance transducers
have :->Retaining calibration
115.The amount of water vapor actually present in the air is
called as :->Absolute humidity
116.The average speed measurements are given by :->Drag
cup tachometer
117.The bridge constant (sensitivity) of full bridge
arrangement when two strain gauges of adjacent Limbs suffer positive strain and
the two
remaining gauges suffer negative sign (when compared to
quarter bridge) :->Quadruple
118.The bridge constant (sensitivity) of half bridge
arrangement where two strain gauges suffer equal And opposite strains is (when
compared
with quarter bridge) :->Doubled
119.The calibration standard for hygrometer is
:->Gravimetric hygrometer
120.The capacitive and inductive transducers cannot be used
in some applications due to :->Large Mass and size
121.The change in output voltage dvo for half bridge is _
_Where Vs is the excitation voltage F is the gauge factor E is the strain
:->VsF E / 2
122.The change in output voltage for full bridge is _ _ _ _
_Where Vs is the excitation voltage F is the gauge factor E is the strain
:->VsF E
123.The change in output voltage for quarter bridge is _ _
Where Vs is the excitation voltage F is the gauge factor E is the strain
:->VsF E / 4
124.The desired condition of the controlled variable is
:->Reference
125.The direct output from dynamometer is :->Torque
126.The drag cup Tacho meter principle is based on
:->Torque generated by eddy current
127.The electric switch is an example of :->Open-loop
control system
128.The name of the element, which determines the difference
between the reference point and Measured variable is. :->Controlled
129.The out put of the ballast circuit when compared with
quarter bridge configuration of wheat stone bridge :->Equal
130.The output of a standard strain gauge load cell is
:->
131.The output of Dunmore type absorption hygro meter is
:->Relative humidity
132.The particular variable to be regulated is known as
:->Controlled
133.The phase angle Ø of sesimic mass instrument output is a
not function of :->Mass
134.The phase shift in vibrometer seismic mass type is
:->Linear shift with frequency
135.The prime objective of any control system is to maintain
the _ _ _ _ _ _ _ _ _ _ _ variable at the reference set point :->Controlled
136.The principle behind multi- level platform scale in
force measurement is :->Balance the force Against a known gravitational
force on
a standard mass
137.The principle behind the hydraulic load cell in force
measurement is :->Translating the force to a fluid pressure and the
measuring
the resulting pressure
138.The principle behind the proving ring is :->Applying
the force to some elastic member and Then measuring the resulting
deflection.
139.The process material in the controlled system or flowing
through it in which the variable is to be controlled is called as
:->Controlled
medium
140.The quality or condition that is varied as a function of
the actuating signal so as to change the value of controlled variable. :-
>Manipulated variable
141.The resistance change in a metallic strain gauge is a
factor of :->Change in area and length
142.The seismic mass instrument measures :->The relative
displacement between mass housing
143.The seismic mass transducer for the measurement of
acceleration and vibration is a :->Second Order instrument
144.The sensitivity of wire - wounded strain gauge will
increase with increase in :->Gauge factor
145.The speed of a sealed compressor units can be measured
by :->Vibrating reed Tachometer
146.The stroboscopic method of speed measurement has the
advantage that :->There is no need of any physical contact between the
instrument and the rotating shaft
147.The Tacho generator principle is based on :->Tacho
generator
148.The Tacho meter principle is based on :->Faraday's
law
149.The Tacho meter which operates based on torque generated
from eddy currents is :->Drag cup type
150.The width of the wedge at the point where the image over
lap while using the vibrating edge for vibration measurement is :->Double
the
amplitude of motion
152.'Time between the pulses' will be used to measure torque
in the following way of torque measurement. :->Electrical
153.To avoid moisture absorption the following type of
cement will be selected :->non - hygroscopic
154.To have a large change in resistance for a small
changing in strains, one has to use :->A strain Gauge with a large gauge
factor
155.To increase the range of use, input frequencies of a
sesimic mass type vibrometer should be :- >Above the instrume nt undamped
natural frequency
156.Traffic light at a junction is an example of :->Open
- loop control system
157.Transfer function is :->Output / input
158.Translating the force to a fluid pressure and then
measuring the resulting pressure to measure the applied force is used in
:->Hydraulic
load cell
159.Transmission dynamometers :->Will measure powe r whe
n it is being transferred from one place to other place
160.Unlimited values of static accelerations can be fed to
accelerometers during calibration by :->Centrifuge method
161.Vibrating wedge is used to measure :->Amplitude of
vibration
162.Vibration pickups will be made to have :->Low undampe
d natural frequency
163.Vibrometer out put is proportional to :->Displacement
164.VsF E is the change in output voltage of (Vs is
excitation voltage, F is gauge factor, E is strain) :->Full bridge
165.When a disk is rotating at 900 rpm, the frequency of
light where image of a single mark on the Disk appears as double and stationery
is :-
>1800 rpm
166.When a disk is rotating at 900 rpm. The frequency of
light where image of a s ingle mark on the disk appears single stationery mark
is :-
>450 rpm
167.When one strain gauge is used the bridge output is k.
When 'n' no of strain gauges is used then the output voltage is :->n k
168.When the shafts are inaccessible, then what type of
Tachometer will be used to measure speeds. :- >Vibrating reed Tachometer
169.When the wet bulb and dry bulb temperature are known
from the psychometric charts we can find out:->Specific humidity
170.When using a wheat stone bridge circuit for measuring
strain, the accurate technique is initial resistance is equal to :->Balanced
condition (Null)
171.Which bonding material will be used to bond strain
gauges at 200 0 C :->The rmoset
172.Which bonding material will be used to bond strain
gauges at 800 C :->The rmo plastic
173.Which bonding material will be used to bond strain
gauges at greater than 200 0 C :->Special ceramic
174.Which instrument uses the principle of "change of
electrical resistance with change in humidity" as the humidity measuring
technique. :-
>Dunmore hygro meter
175.Which of the following cannot be the controlled variable
of a servomechanism :->Torque
176.Which of the following cannot be used for dynamic
straining :->Balanced condition (Null)
177.Which of the following gauge will exhibit freedom form
faulty insulation :->Unbonded type
178.Which of the following gauges are less suit to measure
bending strains :->Unbonded type
179.Which of the following gauges have high gauge factor
:->Semi - conductor gauges
180.Which of the following gauges have poor heat dissipation
:->Unbonded type
181.Which of the following gauges have very little or no
transverse sensitively :->Unbonded type
182.Which of the following gauges will exhibit less creep
hystersis :->Unbonded type
184.Which of the following is a characteristic of closed-
loop system :->The error signal activates the control element to minimize
the
error and bring the system output to the desired value
185.Which of the following is a desired characteristic for
strain gauge bonding materials. :->High dielectric strength
186.Which of the following is a desired characteristic for
strain gauge bonding materials. :->Non - hygroscopic
187.Which of the following is a multi lever balancing type
force measuring instrument :->Pendulum scale
188.Which of the following is a null type instrument
:->Servo accelerometer
189.Which of the following is disadvantage with ballast
circuit :->Providing temperature Compensation is difficult
190.Which of the following is not a method of temperature
compensation in strain gauge :->Duco gauge
191.Which of the following is the characteristic of open -
loop system :->For the given set-input, the Re may be big vibration of the
controlled variable
192.Which of the following material has a negative gauge
factor, when used as strain gauge :->Nickel
193.Which of the following materials will be used for strain
gauges tha t can be used for static strain measurement :->Advance
194.Which of the following materials will be used for that
can be used for high temperature applications :->Iridium platinum
195.Which of the following materials will be used for that
can be used for dynamic strain measurements :->Nichrome
196.Which of the following strain gauge are brittle and not
suitable for measurement of large strains :->Semi - conductor gauges
197.Which of the gauge has inherent temperature compensatio
n :->Dual gauge
198.Which type of gauge you will recommend, for curved
bonded surface :->Foil gauges
199.Which type of the following gauge the gauge factor is
not constant but varies with strain and temperature :->Semi - conductor
gauges
200.While measuring pure torsion, the strain gauges are
bonded to the shaft :->At 450 to the axis of rotation
201.Windage torque is :->Lowest possible powe r or torque
required to turn the rotating parts and to over come the bearing friction
and othe r Windage losses
