Principles of Electronic Instrumentation Mid - II, November - 2014

1.In practical galvanometer design, perfect field uniformity cannot be achieved because of _______ at the tips of the pole pieces.
  • Effect of static friction
  • Flux fringing
  • Noise
  • None of these
Answer: B
2.The quality of the written record is improved by increasing the contact ___________ of the pen or stylus against the paper.
  • Voltage
  • Pressure
  • Distance
  • Resistance
Answer: B
3.When an unmodulated signal is applied to the receiver, the noise output generally
  • Increases
  • Decreases
  • Constant
  • Oscillates
Answer: B
4.In FM voice receivers a measure is needed of the maximum deviation that can be accepted for certain degradation in sinad sensitivity is called
  • Modulation acceptance bandwidth
  • Noise figure
  • Single side band distortion
  • Differential time delay
Answer: A
5.When the modulation input to an AM or FM transmitter is removed, the variations in the rf envelope amplitude are called
  • Residual AM noise
  • Residual FM noise
  • Single side band distortion
  • Modulation acceptance bandwidth
Answer: A
6.The ______ ability is used in inductance bridges because of poor bridge components.
  • Conductance
  • Inverting
  • Transverse
  • None of above
Answer: B
7._______ bridge is used for high Q measurements
  • Hays
  • Maxwels inductance capacitance
  • Series Resonant
  • Wheatstone bridge
Answer: A
8.The ‘T’ networks are used mainly at _______ frequencies.
  • Audio
  • Radio
  • Visible
  • Gamma
Answer: B
9._______ Oscilloscopes are used to reconstruct very high frequency signals
  • Storage
  • Dual beam
  • Dual trace
  • Sampling
Answer: D
10.Monochromatic television uses _______ phosphor
  • P19
  • P22
  • P2
  • P4
Answer: D
11.The servo recording performs the task generally called as _________________.
Answer: Strip-chart recorder
12.All the closed loop null balance systems are virtually _________________.
Answer: Identical
13.For very small signal ______________, the receiver is operating under threshold region.
Answer: EMI
14.RTCA stands for ___________________.
Answer: Radio technical commission for aeronautics.
15.The automatic gain control rise usually expressed in _________________.
Answer: Decibels
16.___________ tube is known as cathode ray tube.
Answer: Crookes
17.The function of a CRO is ______________ and analyzing a wave form.
Answer: Displaying
18.When beam hits phospher screen, ____________ & _____________ phenomenon are observed.
Answer: Fluorescence & Phosphorescence
19.Depositing thin layer of aluminum on the non viewed side of phosphor is called ____________.
Answer: Aluminizing
20._________ storage CRT uses a dielectric material.
Answer: Mesh