# A voltmeter with a broad band width has

1.  Low noise level and high sensitivity

2.  High noise level and high sensitivity

3.  High noise level and high sensitivity

4.  Low noise level and low sensitivity

4

High noise level and high sensitivity

Explanation :
No Explanation available for this question

# The deflection of an electron beam on a CRT screen is 10 mm. if the pre-accelerating anode voltage is halved and the potential between deflecting plates is doubled, the deflection of then electron beam will be

1.  80 mm

2.  40 mm

3.  20 mm

4.   10 mm

4

10 mm

Explanation :
No Explanation available for this question

# If the distance of screen from a CRT to center of deflection plates is 15 cm. length of deflection plates is 2 cm, distance between plates is 1 cm and the accelerating voltage is 500 V, then deflection sensitivity is

1.  33.2 V/cm

2.      0.03 cm/V

3.  66.4 V/cm

4.    0.015 cm/V

4

0.015 cm/V

Explanation :
No Explanation available for this question

# In modern electronic multimeter, a FET or MOSFET is preferred over BJT because

1.  Its input resistance is high

2.  Its input resistance is high and does not change with range switch

3.  Its input resistance is low

4.  It is cheaper

4

Its input resistance is high and does not change with range switch

Explanation :
No Explanation available for this question

# If the Q factor of a coil which is woL/R is measured by varying the frequency, the

1.  Plot between Q and frequency is linear

2.  Value of Q initially decreases with increase of frequency and afterwards increases with increases frequency

3.  Value of Q initially decreases with increase of frequency and afterwards increases with increases frequency

4.  Q factor remains constant irrespective of the value of frequency

4

Value of Q initially decreases with increase of frequency and afterwards increases with increases frequency

Explanation :
No Explanation available for this question

# The Q factor or of a coil at the resonant frequency 1.5 MHz of an RLC series circuit is 150. The bandwidth will be

1.  225 MHz

2.      1.06 MHz

3.  10 kHz

4.   none of these

4

10 kHz

Explanation :
No Explanation available for this question

# The resonant frequency of an RLC series circuit is 1.5 MHz with the tuning capacitor set at 150 pF. The bandwith is 10kHz. The effective resistance of the circuit is

1.  29.5

2.    14.75 ?

3.    9.4 ?

4.    4.7 ?

4

4.7 ?

Explanation :
No Explanation available for this question

# The true value of Q of a coil is 245 and the measured value of 244.5. the ratio of distributed capacitance to self capacitance of the coil is

1.  2.04 × 10-3

2.      1.002

3.      0.997

4.    None of these

4

2.04 × 10-3

Explanation :
No Explanation available for this question

# A photo voltaic cell is connected across a very large value of resistance, its sensitivity at higher illumination levels is typical

1.  Infinity

2.  Zero

3.  Some finite value which is very large

4.  Some finite value which is very small and nears zero

4

Some finite value which is very small and nears zero

Explanation :
No Explanation available for this question

# Which of the following photo-electric devices is most suitable for digital applications

1.  Photo-emissive cell

2.  Photo diode

3.  Photo transistor

4.  Photo voltaic cell

4