Quiz Electronics Engineering
Exam: NIC
Topic: Miscellaneous
Date: 08/09/2020
Each Question carries 1 Mark
Negative Marking: 1/4
Time: 10 Minutes
Q1. Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I List-II
A. SSB 1. Envelope detector
B. AM 2. Integrate and dumb
C. BPSK 3. Hilbert Transform
4. Ratio detector
5. PLL
Codes:
A B C
(a) 3 1 2
(b) 3 2 1
(c) 2 1 3
(d) 1 2 3
Q2. Consider the following statements:
Plane wave propagation through a circular waveguide results in
1. TE modes
2. TM modes
Which of the above statements is/are correct?
(a) 1 only
(b) 2 only
(c) both 1 or 2
(d) either 1 and 2
Q3. Ready pin of a microprocessor is used: –
(a) to indicate that microprocessor is ready to receive input.
(b) to introduce wait states.
(c) to indicate that microprocessor is ready to receive output.
(d) to provide direct memory access
Q4. Result of subtraction of binary number 0101 from the binary number 1110 will be
(a) 0101
(b) 1001
(c) 1100
(d) None of these
Q5. If a system produces frequencies in the output that are not present in the input, then the system cannot be
(a) Minimum Phase System
(b) Stable and Linear
(c) Stable and Causal
(d) Linear Shift Invariant
Q6. IEEE 802.11 is standard for
(a) Wireless LANs
(b) Ethernet
(c) Bluetooth
(d) Broadband wireless
Q7. Clock speed of a 8085 microprocessor is:
(a) 5 MHz
(b) 10 MHz
(c) 80 MHz
(d) 3 MHz
Q8. While calculating R_Th , constant current sources in the circuit are?
(a) replaced by opens
(b) replaced by shorts
(c) treated in parallel with other voltage sources
(d) converted into equivalent voltage sources
Q9. What does the expression ½ J ⃗. A ⃗ represent?
(a) Electric energy density
(b) Radiation resistance
(c) Power density
(d) Magnetic energy density
Q10. Which of the following material finds application in light emitting diodes?
(a) Silicon
(b) Phosphorous
(c) Sulphur
(d) Gallium phosphide
SOLUTIONS
S1. Ans.(a)
Sol.
SSB → Hilbert Transform
AM → Envelope detector
BPSK → Integrator and dumb
S2. Ans.(c)
Sol. Circular Waveguide supports both Transverse Electric (TE) and Transverse Magnetic (TM) modes.
S3. Ans.(c)
Sol. READY signal is used to interface with the slower peripheral devices(Memory or I/O devices) to the microprocessor. If Ready signal is ‘HIGH’ then peripheral devices can transfer data but if Ready Signal is ‘LOW’ then peripheral device can’t transfer data. It waits for signal to become ‘HIGH’.
S4. Ans(b)
Sol. Convert both binary number to decimal and then do the subtraction and again convert back to binary number.
Step 1: Binary to decimal
⇒ 11102 = 1410
⇒ 01012 = 510
Step 2: Do subtraction
⇒ 14 – 5 = 9
Step 3: Convert back to binary number
⇒ 910 = 10012
⇒ 1110 – 0101 = 1001
S5. Ans.(d)
Sol. If a system producing frequencies in the output that are present in the input then the system is Linear Shift Invariant but if there is no presence of frequency in the input and output produces frequency then system cannot be Linear Shift Invariant.
S6. Ans.(a)
S7. Ans.(d)
S8. Ans.(a)
S9. Ans.(d)
Sol. Magnetic Energy Density is
(dW_H)/dv = 1/2 B ⃗. H ⃗ = 1/2 J ⃗. A ⃗ = 1/2µH^2
S10. Ans.(d)
