ONLINE MCQ EE AND ECE-Measurements and Instrumentation Part 16

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

Answer  
2. 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

Answer  
3. 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

Answer  
4. 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

Answer 
5.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  
6. 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

Answer  
7. 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

Answer  
8. 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  
9. 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

Answer  
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

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