There are 9 questions to be attended in 20 minutes. The questions are on Measurement and Instrumentation. The study material is provided along with the remarks for each answer after you complete the examination to help building knowledge on the subject. It may be better to study before attempting the mock drill so that by the time you reach 9th of the test, you score is around 80-90%. There are 9 question banks of 9 question each and you should attempt each of these question bank to test your preparedness for the final day of the RRB examination for SSE and JE to be held in Dec.
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There are 9 questions to be attended in 20 minutes. The questions are on Measurement and Instrumentation. Read the study material before making an attempt so that you build your confidence in the subject. This is the second of the series of 9 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.
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Question
Answer
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1
A odometer of a locomotive is calibrated on a wheel circumference of 3300 mm. What percentage error it will produce when the wheel circumference reduces to 3100 mm?
6.06% Less
Let the wheel rotation is N rpm, than the distance travelled in 1 hour will be (C*N*60/1000) Km; Displayed Speed= 3300*N*60/1000= 198N and Actual is 3100*N*60/1000=186N. It will record 12N less and error will be (12N/198N)*100= 6.06% Less
2
Unit of length in SI unit system is
Meter
Meter, Kilogram, Seconds are SI units
3
Measurement of distance by measuring the number of revolutions of the wheel to cover the distance is called
Odometer
Odometer is well known measurement instrument for speed and distance used in automobiles. This odometer consists of a wheel with a handle and a counter to count the number of rotations and a scale on the wheel rim to determine the exact distance traversed. The other options does not exists.
4
A gauze pressure reads 8.6 Kg/cm², what is the absolute pressure?
9.63 Kg/cm²
Absolute pressure the sum total of gauze pressure and atmospheric pressure
5
What will happen when an ammeter is connected instead a voltmeter?
it will get over heated with smoke emission
The meter will draw very high current as the entire voltage is applied across the coil and its shunt. Unless fuse is available which will blow, the shunt will get overheated due to flow of large current and smoke may also emit.
6
An automatic door opener uses a sensor which emits
ultrasound wave
Ultrasound sensors are widely used for many engineering application. Ultrasonic sound wave is high frequency sound wave ranging above 20 kHz. It is used in measurement of distance, flow in pipes, imaging (sonograph), automatic door opening detecting obstruction and also alarm for intruder, level detection, Non-destructive testing for non-contact detection of flaw in materials.
7
The effect discovered by Doppler is used for the measurement of
all
The Doppler effect (or Doppler shift) is the change in frequency of wave (or other periodic event) for an observer moving relative to its source. When media also changes, the net effect can be worked out. It had wide application in measurements of distance, flow measurement, non-invasive measurements, blood flow measurement, astronomy, radar etc.
8
Which of the following bridge can be used for measurement of frequency?
Wein
9
Doppler shift flow meters are used for
liquid with bubbles, slurries and gases with sound reflecting particles
Doppler-shift flow meters operate on the principle that the wave length of an approaching sound source is shorter than the wavelength of the same source as it is moving away. A transducer emits a sound wave which reflects off particles or bubbles back to the transducer. The measured difference in the wavelengths of the transmitted signal versus the reflected signal is proportional to the process’ velocity. Doppler flow meters are used for slurries, liquids with bubbles, or gases with sound-reflecting particles. They can also be adapted for use in open channels by integrating with level transmitters.
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Question 1 of 9
1. Question
A odometer of a locomotive is calibrated on a wheel circumference of 3300 mm. What percentage error it will produce when the wheel circumference reduces to 3100 mm?
Question 2 of 9
2. Question
Unit of length in SI unit system is
Question 3 of 9
3. Question
Measurement of distance by measuring the number of revolutions of the wheel to cover the distance is called
Question 4 of 9
4. Question
A gauze pressure reads 8.6 Kg/cm², what is the absolute pressure?
Question 5 of 9
5. Question
What will happen when an ammeter is connected instead a voltmeter?
Question 6 of 9
6. Question
An automatic door opener uses a sensor which emits
Question 7 of 9
7. Question
The effect discovered by Doppler is used for the measurement of
Question 8 of 9
8. Question
Which of the following bridge can be used for measurement of frequency?