# Which meter is suitable for the, measurement of 10 mV at 50 MHz

1.  Moving-iron voltmeter

2.  VTVM

3.  Electrostatic voltmeter

4.  C.R.O.

4

C.R.O.

Explanation :
No Explanation available for this question

# The Lissajous pattern obtained on a CRO screen is shown in the given figure. The frequency ratio of the vertical signal to the horizontal signal is

1.  3 : 2

2.  5 : 1

3.  1 : 5

4.  2 : 3

4

5 : 1

Explanation :
No Explanation available for this question

# To the y-input of a CRO a signal defined by 10 sin 100t is applied. To the x-input the signal 10 cos 100t is fed. The gain for both x-channel and y-channel is the same. The screen shows

1.  sinusoidal

2.  a straight line

3.  an ellipse

4.  a circle

4

a circle

Explanation :
No Explanation available for this question

# A CRO screen has ten divisions on the horizontal scale. If a voltage signal 5 sin (314 t 450) is examined with a line base setting of 5 m sec/div, the number of cycles of signal displayed on the screen will be

1.  0.5 cycles

2.  2.5 cycles

3.  5 cycles

4.  10 cycles

4

2.5 cycles

Explanation :
No Explanation available for this question

# A Lissajous pattern, as shown in the figure is observed on the screen of a CRO when voltage of frequencies fx and fy are applied to the X and Y plates respectively. Then f x: fy is then equal to

1.  3 : 2

2.  1 : 2

3.  2 : 3

4.  2 : 1

4

1 : 2

Explanation :
No Explanation available for this question

# Two sine waves of same frequency are impressed of the x and y plates of a CRO and the Lissajous figure seen is shown in the given figure: The phase difference between the, signals is

1.  300 or 3300 or 1500 or 2100

2.  300 or 3300 or 1500

3.  300 or 3300

4.  300

4

300 or 3300

Explanation :
No Explanation available for this question

# When the horizontal deflecting plates of a CRO are kept at the ground potential and 30 V dc is applied to the vertical deflecting plates, then the picture observed on the screen would be

1.  a Spot approximately 3 cm away from the, centre

2.  a vertical line 2 cm long

3.  a vertical line approximately 3 cm long

4.  two spots 2 cm vertical above each other

4

a vertical line approximately 3 cm long

Explanation :
No Explanation available for this question

# To minimize the loading of the circuit under test, the input impedance of a CRO should

1.  be low

2.  be high

3.  be capacitive

4.  match with the output impedance of the circuit

4

be low

Explanation :
No Explanation available for this question

# Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous' figure is a straight line. The phase shift between the two signals would be

1.  zero

2.  90 degrees

3.  either zero or 180 degrees

4.  either 90 degrees or 270 degrees

4

zero

Explanation :
No Explanation available for this question

1.  10.6 V

2.  11.1V

3.  12.6 V

4.  15 V

4