UPPSC-LECTURER’21 EE: Daily Practices Quiz 05-Oct-2021

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UPPSC-LECTURER’21 EE:  Daily Practices Quiz

UPPSC-LECTURER’21 EE: Daily Practices Quiz 05-Oct-2021

Each question carries 3 marks.
Negative marking: 1 mark each or 1/3rd
Total Questions: 06
Time: 08 min.

Q1. Which of the following is a non-maskable interrupt of 8085 microprocessors?
(a) INTR
(b) TRAP
(c) RST 6.5
(d) RST 7.5

Q2. A 1:5 step-up transformer has 120 V across the primary and 600 Ω resistance across the secondary. Assuming, 100 % efficiency, the primary current equals…
(a) 5 A
(b) 10 A
(c) 20 A
(d) 0.2 A

Q3. A bipolar transistor has α=0.98, ICO=10 µA. If the base current is 100 µA, then collector current would be
(a) 4.9 mA
(b) 2.9 mA
(c) 3.4 mA
(d) 5.4 mA

Q4. What are the average and RMS values of half wave rectified output if peak voltage is 5 V?
(a) 1.59 V, 2.5 V
(b) 3.18 V, 2.5 V
(c) 1.59 V, 5 V
(d) 3.18 V, 5 V

Q5. What is the value of charging current in short transmission lines?
(a) Less than medium transmission lines
(b) Equal to medium transmission lines
(c) More than medium transmission lines
(d) More than long transmission lines

SOLUTIONS

S1. Ans.(b)
Sol. The hardware vectored interrupts are classified in to maskable and non-maskable interrupts.
TRAP is non-maskable interrupt.
RST 7.5, RST 6.5, RST 5.5 and INTR are maskable interrupt.

S2. Ans.(a)
Sol. K=5
R1=600/K^2 =600/25=24 Ω
∴I1=V1/R1 =120/24=5 A

S3. Ans.(d)
Sol. α=0.98 (given)
∴current gain factor(β)=α/(1-α)=0.98/(1-0.98)=49
∴IC=βIB+(1+β) ICO=49×100×10^(-6)+(1+49)×10×10^(-6)=5.4 mA

S4. Ans.(a)
Sol. For half-wave rectifier: Vavg=Vm/π=5/3.14=1.59 V
And Vrms=Vm/2=5/2=2.5 V

S5. Ans.(a)
Sol. Line to Earth capacitance of short transmission line is less than that in medium and long transmission line and is negligible. Because of this the charging current of short transmission line is less than that in medium and long transmission line and is negligible.

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