LVDT MCQs with Answers

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LVDT MCQs with answers: Following Multiple Choice Questions (MCQs) are based on “LVDT”. It is related to subject Instrumentation, Industrial Measurement and Applications. This topic is mostly beneficial in the field of Instrumentation, Electronics, Electrical and Mechanical Engineering.

These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.

MCQs on LVDT

Que.1 Full form of LVDT is
  1. Linear Variable Differential Transducer
  2. Line Voltage Differential Transformer
  3. Linear Variable Differential Transformer
  4. Line Voltage Differential Transducer

✔ View Answer

Option 3: Linear Variable Differential Transformer

Que.2 Which of the following quantity can be directly measured by LVDT?
  1. Displacement
  2. Force
  3. Pressure
  4. Weight

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Option 1: Displacement

Explanation:
LVDT can dirctly measure displacement. Further, this displacement can be used to measure pressure, weight, force and velocity.

Que.3 LVDT is ______ type of transducer.
  1. Resistive
  2. Capacitive
  3. Inductive
  4. Optical

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Option 3: Inductive

Explanation: Because LVDT has core and winding. The principle of working of LVDT is same as that of transformer. Therefore, change in induced e.m.f. is measured in it.

Que.4 Identify the correct statement from the following.
  1. LVDT is an active transducer.
  2. At null point the output voltage of LVDT should be maximum.
  3. LVDT can tolerate a high degree of shock and variation, especially when the core is loaded with spring.
  4. LVDT does not get affected by the vibrations and temperature variation.

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Option 3: LVDT can tolerate a high degree of shock and variation, especially when the core is loaded with spring.

Explanation:
LVDT is an inductive type passive transducer.
At null point thhee output of LVDT should be zero.
It is an electromagnetic device, so it also gets affected by the vibrations and temperature variation.

Que.5 An AC LVDT has ___ input and ___ output.
  1. AC, DC
  2. DC, AC
  3. AC, AC
  4. DC, DC

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Option 3: AC, AC

Que.6 The LVDT has
  1. one primary and two secondary windings.
  2. two primary and one secondary winding.
  3. one primary and one secondary winding.
  4. two primary and four secondary windings.

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Option 1: one primary and two secondary windings.

Que.7 An LVDT has ____.
  1. fixed core and movable windings
  2. movable core and movable windings
  3. movable core and fixed windings
  4. fixed primary and movable secondary winding

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Option 3: LVDT has movable core and fixed windings.

Que.8 If physical quantities such as force, tension or pressure are to be measured then LVDT acts as a
  1. Primary transducer
  2. Secondary transducer
  3. Both 1 and 2 are correct
  4. Both 1 and 2 are wrong

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Option 2: Secondary transducer

Que.9 Which of the following is not a type of LVDT?
  1. Unguided armature
  2. Captive armature
  3. Inductive armature
  4. Spring-extended armature

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Option 3: Inductive armature

Que.10 No contact is made between armature and core in

Unguided armature LVDT

Captive armature LVDT

Spring-extended armature LVDT

None of the above

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Option 1: Unguided armature LVDT

Que.11 Identify the incorrect statement/s.
(i) LVDT gives high output value so that there is no need for any amplifier circuit for the amplification process.
(ii) LVDT is not sensitive to Stray Magnetic Field.
  1. Only statement (i)
  2. Both statements (i) and (ii)
  3. Only statement (ii)
  4. None of the statement

✔ View Answer

Option 3: Only statement (ii)

Explanation:
Disadvantages of LVDT
Since LVDT is Inductive Transducer, therefore it is sensitive to Stray Magnetic Field. Hence an extra setup is required to protect it from Stray Magnetic Field.
Since it is an electromagnetic device, therefore it also gets affected by the vibrations and temperature variation.

Que.12 Identify the incorrect statement from the following.
  1. LVDT has natural null point in middle.
  2. LVDT consumes very low power during its operation.
  3. Due to the absence of Friction, dynamic response of LVDT becomes very fast to change in a core position.
  4. LVDT gives high hysteresis losses hence repeatability is poor under any condition.

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Option 4: LVDT gives high hysteresis losses hence repeatability is poor under any condition.

Explanation:
Advantagess of LVDT
1. Rugged Operation:- It can tolerate a high degree of shock and variation, especially when the core is loaded with spring.
2. Low Power consumption:- LVDT consumes very low power of approx 1W during its operation.
3. Direct conversion to Electrical Signal:- They convert linear displacement directly to the corresponding electrical voltage signal which are easy to process further.
4. Fast dynamic Response:- Due to the absence of Friction, Its dynamic response becomes very fast to change in a core position.

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