Multiple Choice Questions Topic Outline
- MCQs in Volt Meter, Ohm Meter, Ammeter (analog/digital)
- MCQs in R-L-Z bridges
- MCQs in Oscilloscope
- MCQs in Cable Testers
- MCQs in RF Meters
- MCQs in Signal Generators (audio, RF, video)
- MCQs in Noise Generators
- MCQs in Power
- MCQs in Reflectometer
- MCQs in Grid dip meter
- MCQs in Instrumentation
The Series
Following is the list of multiple choice questions in this brand new series:
Start Practice Exam Test Questions Part 1 of the Series
1. What king of instrument an ammeter is?
- A. An indicating
- B. A recording
- C. An integrating
- D. A dc meter
2. As the deflection of the moving system increases, the controlling torque in an indicating instrument.
- A. Remains the same
- B. Increases
- C. Decreases
- D. Becomes zero
3. Which is the best type of meter movement?
- A. Iron-wave
- B. Dynamometer
- C. D’ Arsonval
- D. Moving iron
4. Which dynamometer type has uniform scale?
- A. Wattmeter
- B. Voltmeter
- C. Ammeter
- D. Ohmmeter
5. When both deflecting and controlling torque act, the pointer of an indicating instrument comes to
- A. Rest
- B. Mid-position
- C. Maximum position
- D. Three-fourth position
6. The output voltage of a thermocouple
- A. Remains constant with temperature
- B. Decreases with applied voltage
- C. Increases with temperature
- D. Increases with applied voltage
7. An instrument in which the magnitude of the measured quantity is indicated by means of a pointer
- A. Analog instrument
- B. Digital instrument
- C. Ammeter
- D. Voltmeter
8. If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?
- A. Controlling torque
- B. Damping torque
- C. Damping and controlling torques
- D. Frictional torque
9. How can electrical currents be inducted with a coil and a magnet?
- A. By placing the coil parallel to the magnetic field
- B. By placing the coil at right angles with the magnetic field
- C. By moving either the magnet or the coil
- D. By keeping the coil and the magnet perfectly stationary
10. When should a fuse be replaced with a higher rated unit?
- A. Never
- B. When the original value is not available
- C. If it blows
- D. When fuses of the original value are small in size
11. The pointer of an indicating instrument is generally made of
- A. Copper
- B. Silver
- C. Aluminum
- D. Gold
12. The time interval that a waveform is high (or low) is the _______ of the signal.
- A. Pulse width
- B. Pulse length
- C. Pulse position
- D. Duty cycle
13. A Wheatstone bridge is balanced if
- A. the ratio of resistors on one side of the bridge is one while the ratio of resistors on the other side is infinity
- B. the ratio of resistors on one side of the bridge is greater than the ratio of resistors on the other side
- C. the ratio of resistors on one side of the bridge equals the ratio of resistors on the other side
- D. the bridge uses identical resistors
14. The pointer of an indicating instrument is the final deflected position, the _______ is zero.
- A. Deflecting torque
- B. Controlling torque
- C. Damping torque
- D. Frictional
15. A moving system force in analog instruments which causes the moving system to deflect from its zero position.
- A. Deflecting force
- B. Damping force
- C. Return-to-zero force
- D. Controlling force
16. A moving force in analog instruments which ensures that the deflection of the pointer for a given value of measured quantity always has the same value.
- A. Damping force
- B. Controlling force
- C. NRZ force
- D. Deflecting force
17. All voltmeters except one of the following are operated by the passage of current.
- A. Moving-iron
- B. Dynamometer
- C. Electrostatic
- D. Permanent-magnet moving coil
18. Disc is made of what material in eddy current damping?
- A. Conductor and non-magnetic material
- B. Conductor and magnetic material
- C. Non-conductor and non-magnetic material
- D. Non-conductor and magnetic material
19. The time interval between pulses is called
- A. Pulse frequency
- B. Pulse delay
- C. Pulse duration
- D. Pulse period
20. An oscilloscope provides easy measurement of __________ values.
- A. instantaneous
- B. rms
- C. peak to peak
- D. average
21. An element in electrons which serves as a protection against overload?
- A. Resistor
- B. Transistor
- C. Semiconductor
- D. Fuse
22. What sensor provides a dc voltage approximately 1 V at 10 mW?
- A. Diode sensor
- B. Thermocouple sensor
- C. Thermal sensor
- D. Thermistor sensor
23. Hot-wire instrument has a/an __________ scale.
- A. uniform
- B. squared
- C. logarithmic
- D. exponential
24. For time measurements, _______ scale of the scope is used.
- A. horizontal
- B. diagonal
- C. vertical
- D. both vertical and horizontal
25. Fluid friction damping is employed in one of the following
- A. Dynamometer wattmeter
- B. Induction type energy meter
- C. Hot-wire ammeter
- D. Kelvin electrostatic voltmeter
26. Current range extension in moving coil instruments can be achieved by placing a _______ in shunt with the instrument.
- A. Low resistance resistor
- B. High resistance resistor
- C. High voltage transistor
- D. Capacitor
27. Permanent- magnet moving coil instrument can be used in
- A. ac work only
- B. both dc and ac work
- C. dc work only
- D. neither dc nor ac works
28. What CRT element provides for control of the number of electrons passing farther into the tube?
- A. Cathode
- B. Control grid
- C. Anode
- D. Phosphor screen
29. What refers to garaging two adjustments of an AC bridge together in such a way that changing one adjustment changes the other in a special way, but changing the second adjustment does not change the first?
- A. Logarithmic nulling
- B. Orthogonal nulling
- C. Exponential nulling
- D. Linear nulling
30. When the vertical input is 0V, the electron beam may be positioned at the _______ of the screen
- A. top center
- B. vertical center
- C. horizontal center
- D. bottom center
31. What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?
- A. Because of effective eddy current damping
- B. Because external magnetic field has no effect
- C. Because it is spring controlled
- D. Because it has no hysteresis loss
32. A sensing element that provides a dc voltage less than 10 mV with typical power range of 0.1 to 100 mW.
- A. Thermal converters
- B. Thermal sensors
- C. Thermocouple sensors
- D. Diode sensors
33. Tank circuit frequency can be measured by ________.
- A. Voltmeter
- B. Signal generator
- C. Grid-dip meter
- D. Absorption meter
34. Shunts are generally made of what material?
- A. Constantan
- B. Silver
- C. Aluminum
- D. Manganin
35. What meter is the most sensitive?
- A. 10 ma
- B. 1 ma
- C. 1A
- D. 1 µA
36. A dynamometer instrument is mainly used as a /an
- A. dc ammeter
- B. wattmeter
- C. dc voltmeter
- D. ohmmeter
37. Which movement is the most expensive?
- A. D’ Arsonal movement
- B. Dynamometer
- C. Moving-iron
- D. Iron-wave
38. Attraction and repulsion instruments are considered as
- A. Moving-cell instruments
- B. Moving-iron instruments
- C. Electrodynamic instruments
- D. Dynamometer
39. In Wheatstone bridge, bridge balance is considered where
- A. There is no current that flows through the load
- B. There is current that flows through the load
- C. There is potential difference between load terminal
- D. The galvanometer reading is maximum
40. The temperature coefficient of resistance of the shunt material is
- A. negligible
- B. negative
- C. positive
- D. infinite
41. In VTVMs, ___________ is used to balance both halves of the difference amplifier or cathode-coupled amplifier.
- A. trigger adjust
- B. scale
- C. infinite adjust
- D. zero adjust
42. In an oscilloscope, ________ adjusts the brightness of the spot by changing the voltage on the control grid.
- A. intensity control
- B. focus control
- C. astigmatism control
- D. position control
43. What force in analog instrument quickly brings the moving system to rest in its final position?
- A. Damping force
- B. Controlling force
- C. Deflecting force
- D. Force at rest
44. The resistance of a moving-coil instrument is 10 Ω and gives full-scale deflection at 10 mA. Calculate the resistance of the shunt required to convert the instrument to give full-scale detection when the circuit current is 5 A.
- A. 0.02004 Ω
- B. 0.20004 Ω
- C. 1 Ω
- D. 2.04 Ω
45. A small swamping resistance is connected in series with operating coil of a moving coil ammeter in order to compensate for the effects of
- A. Temperature variation
- B. Hysteresis
- C. External magnetic fields
- D. Temperature inversion
46. The typical power range of diode sensor is
- A. 0.1 µW to 10 mW
- B. 0.1 pW to 10 mW
- C. 0.1 mW to 100 W
- D. 0.1 nW to 10 mW
47. A ______ operates on the magnetic attraction-repulsion principles
- A. Spectrum analyzer
- B. Oscilloscope
- C. Field strength meter
- D. Milliammeter
48. What dc bridge is widely used for the accurate measurements of resistance?
- A. Owen bridge
- B. Hay bridge
- C. Potentiometer bridge
- D. Wheatstone bridge
49. Which of the following is a dc bridge that is very useful for making extremely accurate voltage measurements?
- A. Wheatstone bridge
- B. Potentiometer bridge
- C. Kelvin bridge
- D. Owen bridge
50. Majority of analog measuring instrument utilizes one of the following effects.
- A. Heating effect
- B. Electrostatic effect
- C. Magnetic field
- D. Chemical effect
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