UPPSC-LECTURER’21 EE: Daily Practices Quiz 04-Oct-2021

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UPPSC-LECTURER’21 EE:  Daily Practices Quiz

UPPSC-LECTURER’21 EE: Daily Practices Quiz 04-Oct-2021

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

Q1. The time-constant of the network shown in the figure is

(a) CR
(b) 2 CR
(c) CR/4
(d) CR/2

Q2. The signal is shown below in the figure represents?

(a) Energy signal
(b) Power signal
(c) Energy & power
(d) Neither energy nor power

Q3. For induction motors at low values of slip:
(a) The torque slip is approximately a hyperbola
(b) The torque slip is approximately a straight line
(c) The torque slip curve is at its maximum
(d) The torque slip is approximately a parabola

Q4. The minimum number of two-input NAND gates required to perform the two-input
OR gate?
(a) 1
(b) 3
(c) 2
(d) 4

Q5. Phase reversed of 180⁰ as compared to input occurs in the output of
(a) CE amplifier
(b) CB amplifier
(c) CC amplifier
(d) All of the above

Q6. A single phase, half-wave, controlled rectifier has 400 sin⁡〖(314 t)〗 as the input voltage and R as the load. For a firing angle of 60⁰ for the SCR, the average output voltage is
(a) 200/π
(b) 240/ π
(c) 300/ π
(d) 400/ π

SOLUTIONS

S2. Ans.(d)
Sol. This is ramp signal, ramp signal is neither energy signal nor power signal.

S3. Ans.(b)
Sol. For induction motor –
T=(KS E₂²R₂)/(R₂²+(S×_2)²)
at low value of slip, S×_2≪R₂
⇒ T=(KSE₂²R₂)/(R₂²)
⇒ T∝S

S5. Ans.(a)
Sol. Phase reversed of 180⁰ as compared to input occurs in the output of CE amplifier.

S6. Ans.(c)
Sol. A single phase, half-wave, controlled rectifier, V_avg=V_m/2π(1+cos⁡〖α)〗
∵V_avg=400/2π(1+cos⁡〖60⁰)=(400×3)/(2π ×2)〗=300/π

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