Electronic Measurements and Instrumentation Mid - II, November - 2014

1.The sampling oscilloscope is able to respond and store
  • Rapid bits of information and present them in a continuous display
  • Slowly varying bits of information and present them in continuous display
  • Rapid bits of information and present them in a discrete display
  • Samples and display in digital form
Answer: A
2.The digital storage oscilloscope is more accurate than analog storage oscilloscope because
  • The Time Base Is Generated By a Crystal Clock
  • Collects Data After It Has Been Triggered
  • It Operate In a Babysitting Mode
  • Constant Refresh Time
Answer: A
3.In dual trace oscilloscope, the display will show a continuous line for each channel when the Chopping rate is
  • Much Slower Than Fly Back Period
  • Much Slower Than the Hold-Off Period
  • Much Faster Than the Vertical Sweep Rate
  • Much Faster Than the Horizontal Sweep Rate
Answer: D
4.The high amplitude signals are measured using CRO by placing an attenuator between the
  • Vertical Input Terminal and the Input Terminal of the Horizontal Amplifier
  • Vertical Input Terminal and the Input Terminal of the Vertical Amplifier
  • Horizontal Input Terminal and the Input Terminal of the Vertical Amplifier
  • Horizontal input terminal and the input terminal of the horizontal amplifier
Answer: D
5.An Oscilloscope has an input capacitance of 50pF and resistance of 2 MΩ and the voltage divider ratio of 1Ω. The parameters of a high impedance probe are
  • C1=5.55pf, R1=18 M Ω
  • C1=3.55pf, R1=9 Mω
  • C1=2.55pf, R1=9 M Ω
  • C1=50pf, R1=18 M Ω
Answer: A
6.An X-Y recorder has a sensitivity of 10V/mm, a slewing speed of 1.5m/s and a frequency response about 6 Hz for both the axes. The chart size is 250 x180mm. The accuracy of X-Y recorder is
  • 1%
  • 0.3%
  • 0.2%
  • 0.5%
Answer: B
7.The physical quantity may be plotted against another physical quantity by using
  • Q-Meter
  • Wattmeter
  • X-Y Recorder With Appropriate Transducers
  • Lcr Meter
Answer: C
8.The following device is used to measure the relative humidity
  • Lvdt
  • Scintillation Counters
  • Barometer
  • Hygrometer
Answer: D
9.The major drawback of a seismic accelerometer using resistance potential divider is
  • High Resolution and Natural Frequency
  • High Resolution and Low Natural Frequency
  • Limited Resolution and Low Natural Frequency
  • Limited Resolution and High Natural Frequency
Answer: C
10.The most commonly used transducer for the measurement of liner velocity is
  • Pivot Torque
  • Strain Gauge
  • Electro-Magnetic Transducer
  • Pirani Gauge
Answer: C
11.In the moving coil type velocity transducer, the velocity of coil is proportional to ________________.
Answer: The voltage generated in the coil
12.Microwave Refractometer is used to measure the __________________.
Answer: Humidity
13.Resistive methods for level measurement are not used in ________________.
Answer: Explosive atmosphere
14.The dual trace oscilloscope cannot capture ______________.
Answer: Two fast transient events
15.The bistable storage oscilloscopes depend for their operation, on the principle of _________________.
Answer: Secondary emission
16.The Fast storage oscilloscopes enhance the speed with which they can capture transient information by using ________________.
Answer: Two storage meshes
17.When sinusoidal voltages are simultaneously applied to horizontal and vertical plates of CRT, the resultant pattern is called _______________.
Answer: Lissajous patterns
18.To measure the frequency by CRO using lissajous patterns, the internal sweep generator is _________.
Answer: Switched off
19.In X-Y plotters, an emf is plotted as a function of __________________.
Answer: Another emf
20.An Isolation probe is used more compared to shielded probe to avoid _______________.
Answer: The undesirable circuit loading effects