Cathode Ray Oscilloscope (CRO) MCQ Questions and Answers for Practice

1. A CRO can display

1. Both AC and DC signals
2. Time-invariant signals
3. AC signals
4. DC signals

2. A CRO is used to measure ...............

1. phase
2. all of above
3. voltage
4. frequency

3. A dual-trace CRO has

1. One vertical and two horizontal amplifier
2. Two vertical and two horizontal amplifiers
3. One-vertical and one horizontal amplifier
4. Two vertical and one horizontal amplifier

4. For display of signal pattern ............... voltage is applied to the horizontal plates of a CRO

1. sawtooth
2. none of the above
3. sinusoidal
4. rectangular

5. If the negative potential on the control grid of CRT is increased, the intensity of spot...............

1. remains the same
2. none of the above
3. is increased
4. is decreased

6. The colour of the spot on the screen of a CRO is a characteristic of

1. The coating material on the screen
2. The velocity of the electrons striking the screen
3. Electron gun in a CRT
4. The type of the waveform being observed

7. The horizontal plates of a CRO are supplied with ............... to observe the waveform of a signal

1. sawtooth wave
2. none of the above
3. sinusoidal wave
4. cosine wave

8. The material used to coat inside face of CRT is ...............

1. silicon
2. phosphorus
3. carbon
4. sulphur

9. The most accurate device for measuring voltage is ...............

1. CRO
2. VTVM
3. voltmeter
4. multimeter

10. The time base signal in a CRO is a

1. High frequency sawtooth wave form
2. Square wave form
3. Rectangular waveform
4. High frequency sinusoidal wave form

11. The units for the deflection sensitivity of a CRO are

1. mm/m-volt
2. m/m-volt
3. Meter/volt
4. mm/volt

12. X and Y plates of a CRO are connected to unequal voltages of equal frequency withphase shift of 900. The Lissajous figure on the screen will be

1. Ellipse
2. Figure of eight
3. Circle
4. Straight line