UGC-NET JUNE 2024 – Question paper

1. Arrange the following in the Ascending order based on their dielectric constant.

a. SrTiO₂

b. Y₂O₃

c. TiO₂

d. PZT

Options:

1.  C,A,D,B

2. B,C,A,D

3. D,B,C,A

4. A,D,B,C

2. Which of the following statements are correct about filters

a. The pass band of Chebyshev response is characterized by a series of ripples that have equal maximum levels and equal minimum levels.

b. Butterworth filters have sharper slope than Chebyshev filters.

c. Butterworth filters have poorer time delay and phase characteristics than those of Chebyshev filters.

d. Chebyshev filters achieve more attenuation in stop band for a given number of active elements.

Choose the correct answer from the options given below:

1. B and D only

2. A and B only

3. A and C only

4. A and D only

3. Match List-I with List-II

Choose the correct answer from the options given below:

1. A-II, B-I, C-III, D-IV

2. A-I, B-III, C-IV, D-II

3. A-IV, B-III, C-I, D-II

4. A-IV, B-I, C-II, D-III

4. Match List-I with List-II

5. The minimum double-sided Nyquist Bandwidth for a QPSK modulator with an input data rate (fb) as 10 Mbps and carrier frequency of 70 MHz is:

1. 5 MHz 

2. 10 MHz

3.  20 MHz 

4. 2.5 MHz

6. The correct sequence of the Laplace transforms of their time function as unit step, unit impulse, polynomial, cosine wave and sine wave respectively are:

$\mathit{A}\mathbf{.}\mathbf{ }{\mathit{s}}^{\frac{\mathbf{n}\mathbf{!}}{\mathbf{n}\mathbf{+}\mathbf{1}}}$

$\mathit{B}\mathbf{.}\mathbf{ }\mathbf{1}$

$\mathit{C}\mathbf{.}\mathbf{ }\frac{\mathbf{1}}{\mathbf{s}}$

$\mathit{D}\mathbf{.}\mathbf{ }\frac{\mathbf{s}}{{\mathbf{s}}^{\mathbf{2}}\mathbf{+}{\mathbf{\omega }}^{\mathbf{2}}}$

$\mathit{E}\mathbf{.}\mathbf{ }\frac{\mathbf{\omega }}{{\mathbf{s}}^{\mathbf{2}}\mathbf{+}{\mathbf{\omega }}^{\mathbf{2}}}$

Choose the correct answer from the options given below:

1. A,B,C,D,E

2. C,B,A,D,E

3.  C,B,A,E,D

4. B,C,A,D,E

7. In the circuit, the switch is closed at t=0. The capacitor has no charge for t<0. Evaluate i_r, i_c and v_c for different conditions

$\mathbf{A}\mathbf{.}\mathbf{ }\mathbf{For}\mathbf{ }\mathbf{t}\mathbf{>}\mathbf{0}\mathbf{,}\mathbf{ }{\mathbf{i}}_{\mathbf{R}}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{2}\mathbf{(}\mathbf{1}\mathbf{–}{\mathbf{e}}^{\mathbf{–}\mathbf{100}\mathbf{t}}\mathbf{)}\mathbf{mA}$

$\mathbf{B}\mathbf{.}\mathbf{ }\mathbf{For}\mathbf{ }\mathbf{t}\mathbf{<}\mathbf{0}\mathbf{,}\mathbf{ }{\mathbf{i}}_{\mathbf{R}}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{2}\mathbf{ }\mathbf{mA}$

$\mathbf{C}\mathbf{.}\mathbf{ }\mathbf{For}\mathbf{ }\mathbf{t}\mathbf{>}\mathbf{0}\mathbf{,}\mathbf{ }{\mathbf{i}}_{\mathbf{C}}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{0}\mathbf{.}\mathbf{2}\mathbf{ }{\mathbf{e}}^{\mathbf{–}\mathbf{100}\mathbf{t}}\mathbf{ }\mathbf{mA}$

$\mathbf{D}\mathbf{.}\mathbf{ }\mathbf{For}\mathbf{ }\mathbf{t}\mathbf{>}\mathbf{0}\mathbf{,}\mathbf{ }{\mathbf{v}}_{\mathbf{C}}\mathbf{ }\mathbf{=}\mathbf{ }\mathbf{10}\mathbf{(}\mathbf{1}\mathbf{–}{\mathbf{e}}^{\mathbf{–}\mathbf{100}\mathbf{t}}\mathbf{)}\mathbf{V}$

Choose the most appropriate answer from the options given below:

1. A,B,C only

2. B,C,D only

3.  A,C,D only

4. B,D,A only

8. Arrange the following logic families in ascending order of power dissipation per gate (mW).

A. TTL

B. ECL

C. IIL

D. CMOS

Choose the most appropriate answer from the options given below:

1. D,A,B,C

2. C,B,A,D

3. D,C,A,B

4. C,D,B,A

9. Arrange the following pressure measuring devices in the increasing order of their pressure measurement range.

A. Manometer

B. Hydrostatic compression gauge

C. Piezo electric transducer

D. Ionization gauge 

Choose the most appropriate answer from the options given below:

1. D,C,A,B

2. B,A,C,D

3. C,B,A,D

4. D,A,C,B

10. The voltage of a plate of Hall effect transducer is 5 mV. If the plate is made of Silicon whose K is 6 X 10^-6 Vm/AT, plate thickness is 2mm and value of current through the plate is 4 A. The value of flux density ‘B’ is given by:

1. 0.42 Tesla

2. 0.37 Tesla

3.1.54 Tesla

4. 0.21 Tesla