Electrical Measuring Instruments MCQs | Electrical Measuring Instruments Multiple Choice Questions(MCQs) & Answers

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Questions
1 Hysteresis of an instrument means:
A The change in the same reading when input is first increased and then decreased
B The reliability of the instrument
C The repeatability of the insrument
D The inaccuracy due to change in temperature

Answer: The change in the same reading when input is first increased and then decreased
2 In which part of the scale does the pointer indicate more accurately
A In the first third of the cycle
B In the first half of the cycle
C In about middle of the scale
D In the last third of the cycle

Answer: In about middle of the scale
3 A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under a standard conditions. The maximum possible percentage error in the reading is:
A 0.5
B 1.0
C 2.0
D 4.0

Answer: 2.0
4 The moving iron voltmeters are likely:
A To indicate the same value of the ac as on dc
B To indicate higher value of ac than on dc
C To indicate lower value of ac than on dc
D The moving iron instruments should not be used for dc measurment

Answer: To indicate lower value of ac than on dc
5 Hay’s Bridge is suitable for the measurement of:
A Inductances with Q>10
B Inductances with Q<10
C Capacitors with high dissipation factor
D Capacitors with low dissipation factor

Answer: Inductances with Q>10
6 The ballistic galvanometer is usually lightly damped so that:
A It may oscillate
B It may remain stable
C Amplitude of the first swing is large
D Amplitude of the first swing is small

Answer: Amplitude of the first swing is large
7 Magnetic materials can be tested by:
A Self inductance bridge
B Cambell’s mutual inductance bridge
C AC potentiometer
D All the above

Answer: All the above
8 In CRO astigmatism is:
A Source of generating fast electrons
B Media for absorbing secondary emission electrons
C An additional focus control
D Time-delay control in the vertical deflection system

Answer: An additional focus control
9 Moving iron and PMMC instruments can be distinguished from each other by looking at:
A Pointer
B Terminal size
C Scale
D Scale range

Answer: Scale
10 The deflection of hot-wire instrument depends on:
A Instantaneous value of alternating current
B Average value of current
C RMS value of the alternating current
D Voltage

Answer: RMS value of the alternating current
11 The damping torque must operate only when the moving system of the indicating instrument is:
A Actually moving
B Stationary
C Just starting to move
D Near its full deflection

Answer: Actually moving
12 Air friction damping is used in the instruments which is:
A Moving iron
B Moving coil
C Induction
D Hot wire

Answer: Moving iron
13 An instrument that is capable of measuring only dc is:
A Moving coil
B Moving iron
C Thermo couple
D None of the above

Answer: Moving coil
14 A ballistic galvanometer is used to measure:
A Charge
B Current
C Voltage
D Frequency

Answer: Charge
15 For measuring emf of a standard cell we use:
A Galvanometer
B Potentiometer
C Zener reference
D Electro-dynamic voltmeter

Answer: Potentiometer
16 Introduction of dielectric:
A Increases the capacitance
B Reduces the breakdown voltage
C Reduces the mechanical voltage
D Increases the size of the capacitor

Answer: Increases the capacitance
17 Which of the following instruments have least torque/weight ratio:
A Dynamometer type
B PMMC
C Attraction type moving iron
D Repulsion type moving iron

Answer: Dynamometer type
18 The instrument having its deflection depends upon average value is:
A Moving iron
B Hot wire
C Rectifier type
D Induction type

Answer: Rectifier type
19 Which of the following instruments can be used for full scale deflection of 300o:
A PMMC
B Induction type
C Hot wire
D Electrostatic

Answer: Induction type
20 A Ohmmeter is basically:
A A ammeter
B A voltmeter
C A multimeter
D None of the above

Answer: A ammeter

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