Multiple Choice Questions on Measurement and Instrumentation and Practice Test 3
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 third 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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The Answer Key:
Sl No. Question Answer Remark 1 A body of irregular surface weighing 10 Kg is immersed in water of density 1000 Kg/m³ reads 7 Kg on the spring balance. What is the volume of the immersed body? .003 m³ As per the principle of Archimedes, the loss of weight is equal to the weight of the displaced liquid i.e. Volume*1000 Kg/m³; therefore volume is equal to .003 m³ 2 Weight of 1 kg mass is 1 Kg Unit of mass is Kilogram and same is taken for the weight. It is in Physics, that it is taken as the force of attraction due to gravity and is Mg equal to 1 Newton. Newton is the unit of force. 3 Triangulation technique is widely used for measurement of long distances The method includes measurement of the angle of the object from two locations and than deriving the distance. 4 The working principle of Mercury Barometric Pressure is Balancing the weight of the air column with that of Hg column Weight of the air column exert pressure on the Hg tub which raises the Hg in an orifice having vacuum at the top and thus balancing the weight 5 Moving iron ammeters are used for measurement of DC as well AC Moving iron ammeter consists of iron piece which moves under the influence of electro-magnetic force produce by the current to be measured. The scale is non-linear as the electro-magnetic force produced is directly proportional to the square of the current. 6 Baggage scanners employed at airport uses X-rays to detect prohibited products in baggage Gamma rays are also used for baggage scanners but are used for scanning big containers due to safety issues. 7 Gas lighter uses the principle of Piezo-electric effect It uses the principle of piezo-electric effect where application of pressure on quartz crystal produces voltage which results a spark across a gap 8 Damping torque provided in measuring instrument is proportional to First derivative of angle of deflection The controlling torque is provided by air, fluid, eddy current etc. and the damping torque is proportional to the first derivative of angle with respect to time. 9 Transit time ultrasonic flow meters are used for liquid without bubbles and any suspended particles Transit time ultrasonic flow meters measure the travel time of two sound waves, one wave travels in the same direction as the flow while the other travels against the flow. At stationary condition, sensors receive both waves at the same time, i.e., without transit time delay. As the fluid moves, it takes an increasingly longer time for the downstream wave to reach the upstream sensor. This delay is used to calculated flow rate of liquid or gas. -
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Question 1 of 9
1. Question
A body of irregular surface weighing 10 Kg is immersed in water of density 1000 Kg/m³ reads 7 Kg on the spring balance. What is the volume of the immersed body?
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Question 2 of 9
2. Question
Weight of 1 kg mass is
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Question 3 of 9
3. Question
Triangulation technique is widely used for measurement of
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Question 4 of 9
4. Question
The working principle of Mercury Barometric Pressure is
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Question 5 of 9
5. Question
Moving iron ammeters are used for measurement of
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Question 6 of 9
6. Question
Baggage scanners employed at airport uses
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Question 7 of 9
7. Question
Gas lighter uses the principle of
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Question 8 of 9
8. Question
Damping torque provided in measuring instrument is proportional to
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Question 9 of 9
9. Question
Transit time ultrasonic flow meters are used for
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