Measuring Instrumentation MCQ

1. Anderson Bridge is used to measure:
a) L
b) C
c) V
d) I

A

2. 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

A

3. The frequency can be measured by using:
a) Wien’s bridge
b) De Sauty’s bridge
c) Schering’s bridge
d) Anderson’s bidge

C

4. 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

C

5. B-H Curve is used to determination of:
a) Hysteresis loss
b) Iron loss
c) Eddy current loss
d) Both (a) and (b)

A

6. Magnetic materials can be tested by:
a) Self inductance bridge
b) Cambell’s mutual inductance bridge
c) AC potentiometer
d) All the above

D

7. A PMMC instrument can be used as a fluxmeter by:
a) Using low resistance shunt
b) Removing the control spring
c) Making the control springs of large moment of inertia
d) Using a high series resistance

B

8. Open circuit fault in a cable can be located by:
a) Blavier’s test
b) Capacity test
c) Varley loop test
d) Murray loop test

B

9. In CRO the time base signal is applied to:
a) Y-plates
b) X-plates
c) Either X-plate or Y-plate
d) Both X-plate and Y-plate

B

10.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

C

11. The main advantage of crystal oscillator is that its output is:
a) A Constant frequency range
b) DC
c) 50 Hz to 60 Hz
d) Variable frequency

A

12. Which of the following statement is true of phase-shift type and Wien-bridge type R-C oscillators:
a) Both use positive feedback
b) The former uses positive feedback only whereas the latter uses both positive and negative feedback
c) The former uses both positive and negative feedback
d) Both use negative feedback

B

13. Moving iron and PMMC instruments can be distinguished from each other by looking at:
a)  Pointer
b) Terminal size
c) Scale
d) Scale range

C

14. In a dynamo-meter type of moving coil instrument a swamping resistance is provided inorder to:
a) Control the deflection torque
b) Reduce the bulk of the moving system
c) Reduce the current flowing through the moving coil
d) Provide equal time constant for moving coil and fixed coil, when used for ac measurement

D

15. 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

C