A signal of 10 mV at 75 MGz is to be measured with which of the following instruments    

1.  VTVM

2.  Cathode ray oscilloscope  

3.  Moving iron voltmeter

4.  Digital multimeter

View Answer  
4
Correct Answer :

Cathode ray oscilloscope

 


Explanation :
No Explanation available for this question

How many times base circuits does a dual trace CRO can have

1.  1            

2.     2                

3.       3              

4.        4

View Answer  
4
Correct Answer :

     3              


Explanation :
No Explanation available for this question

A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 100 Hz. The frequency of the vertical input will be

1.  400 Hz                

2.    2500 Hz              

3.   4000 Hz            

4.      5000 Hz

View Answer  
4
Correct Answer :

  2500 Hz              


Explanation :
No Explanation available for this question

In measurements made using a Q-meter, high impedance elements should preferably be connected in

1.  Star                             

2.   Delta                            

3.    Series                  

4.    Parallel

View Answer  
4
Correct Answer :

  Parallel


Explanation :
No Explanation available for this question

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

View Answer  
4
Correct Answer :

C.R.O


Explanation :
No Explanation available for this question

To the y-input of a CRO a signal defined by 10 sin100t 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

View Answer  
4
Correct Answer :

     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.       5cycles                     

4.    10 cycles

View Answer  
4
Correct Answer :

 2.5 cycles                 


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

View Answer  
4
Correct Answer :

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

View Answer  
4
Correct Answer :

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 degree

3.  Either zero or 180 degrees

4.  Either 90 degrees or 270 degrees

View Answer  
4
Correct Answer :

Zero


Explanation :
No Explanation available for this question
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