Q. Which one of the following is correct for ASCII codes for all upper case English letter compared to all lower case English letters?
a. Are all large
b. Are all smaller
c. Are all equal
d. Some are larger and some are smaller
Assertion (A): Time varying electric field produces magnetic fields.
Reason (R): Time varying magnetic field produces electric fields.
a. Both A and R are individually true and R is the correct explanation of A.
b. Both A and R are individually true but R is not the correct explanation of A.
c. A is true but R is false
d. A is false but R is true
Q. When used for amplification, the output port side of a BJT behaves as controlled current source. According to the above, the variation of which one of the following does not change the output current of an
ideal BLT? (The BJT is being used in a common emitter amplifier circuit)
a. Load resistance
b. Collector to base bias voltage
c. Both load resistance and collector to base bias voltage
d. Base-emitter bias voltage
Q. Consider the following parameters of a hybrid-it equivalent circuit of BJT:
1. Transconductance (gm)
2. hfe
3. hie
Which of the above parameters vary with temperature in similar manner (all of them decrease or all of them increase)?
Select the correct answer using the codes given below:
a. Only 1 and 2
b. Only 2 and 3
c. Only 1 and 3
d. 1, 2 and 3
Match List-I (Application of Signals) with
List-II (Defamation) and select the correct
answer using the code given below
List-I
A. Reconstruction
B. Over sampling
C. Interpolation
D. Decimation
List -II
1. Sampling rate is chosen significantly
greater than the Nyquist rate
2. A mixture of continuous and discrete
time signals
3. To convert the discrete time sequence
back to a continuous time signal and
then resample
4. Assign values between samples and
signals
Codes;
A B C D
a. 3 4 1 2
b. 2 1 4 3
c. 3 1 4 2
d. 2 4 1 3
Q. Which one of the following is the correct statement? A rectangular coaxial line can support
a. only TEM mode of propagation
b. both TEM and TE modes of propagation
c. either TE or TM mode of propagation
d. TEM, TE or TM mode of propagation