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RVUNL’21 EE: Daily Practices Quiz 02-Sep-2021

RVUNL Recruitment 2021: The RVUNL exam date is released for a total of 1075 vacancies.
There are two parts for the RVUNL test, Part A and Part B.
Part A will have 60% weightage while Part B has 40% weightage out of the total marks in the online written exam.

RVUNL’21 EE: Daily Practices Quiz 02-Sep-2021
Each question carries 2 marks.
Negative marking: 0.5 mark
Total Questions: 06
Time: 08 min.

Q1. A single phase fully bridge converter supplies a load drawing constant and ripple free load current. If the triggering angle is 30°, the input power factor will be
(a) 0.65
(b) 0.78
(c) 0.85
(d) 0.866
(e) unity

Q2. The current gain of a BJT is:
(a) g_m×r_o

(b) g_m/r_O

(c) g_m×r_π

(d) g_m/r_π
(e) None of the above

Q3. When two amplifier each of bandwidth f_H=10 KHz are cascaded, the overall bandwidth becomes (in KHz)
(a) 10
(b) 6.4
(c) 5
(d) 20
(e) 14.14

Q4. A series resonant circuit is tuned to 10 MHz and provides 3-dB bandwidth of 100 kHz. The quality factor Q of the circuit is
(a) 1
(b) 10
(c) 30
(d) 100
(e) 1000

Q5. An ammeter has a current range of 0–5 A, and its internal resistance is 0.2Ω. In order to change the range to 0–25 A, what should be the value of resistance added and how it would connect with meter (i.e., series/parallel)?
(a) 0.20 Ω/series
(b) 0.20 Ω/parallel
(c) 0.05 Ω/parallel
(d) 0.05 Ω/series
(e) None of the above

Q6. In case of three phase alternating voltages, various voltages are displaced at an angle of:
(a) 4π/3
(b) π/3
(c) 2π/3
(d) 3π/2
(e) π/2




S4. Ans.(d)
Sol. for resonant circuit, Q=f_0/BW=(10×10^6)/(100×10^3 )=100

S5. Ans.(c)
Sol. for extending the range of ammeter, shunt resistance is connected in parallel.
And R_sh=R_m/(m-1)=0.2/(5-1)=0.05 Ω/parallel
Where; m=I/I_m =25/5=5

S6. Ans.(c)
Sol. for n-phase system,
Displacement angle = (360°)/n
For 3-phase,
θ=(360°)/3=120° =120×π/180 radian =2π/3 radian

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