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RVUNL’21 EE: Daily Practices Quiz 10-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 10-Sep-2021
Each question carries 2 marks.
Negative marking: 0.5 mark
Total Questions: 06
Time: 08 min.

Q1. A thermal protection switch can protect against
(a) Short-circuit
(b) Temperature
(c) Overload
(d) Overvoltage
(e) all of the above

Q2. Which semiconductor power device out of the following, is not a current triggering device?
(a) Thyristor
(b) Triac
(c) G.T.O
(d) MOSFET
(e) all of the above

Q3. When both the junctions of bipolar junction transistor (BJT) are in forward biased, then in which region BJT will operate?
(a) Ohmic region
(b) Cut-off region
(c) Saturation region
(d) Active region
(e) none of the above

Q4. An electrodynamometer instrument can be used as ……
1. Wattmeter and VAR meter.
2. Power factor meter and frequency meter.
3. Transfer instrument.
Which of the above statements are correct?
(a) 1 and 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
(e) None of the above

RVUNL 2021, RVUNL ELECTRICAL QUIZ, |_30.1

Q6. Which of the following theorems can be applied to any network linear or non-linear, active or passive, time-variant or time-invariant?
(a) Norton theorem
(b) Thevenin theorem
(c) Superposition theorem
(d) Tellegen theorem
(e) All of the above

SOLUTIONS

S1. Ans.(c)
Sol. Thermal protection switch protects against the overload.

S2. Ans.(d)
Sol. MOSFET is voltage-controlled device.

S3. Ans.(c)
Sol. The region of the output characteristics where both junctions (emitter and collector) are forward biased, is known as the saturation region of the transistor.
Note: –
Cut-off region: in this region transistor acts as off switch.
Saturation region: transistor acts as on switch.
Active region: transistor acts as an amplifier

S4. Ans.(d)
Sol. An Electrodynamometer instruments are used as watt-meters, varmeters and with some modification as power factor meters and frequency meters.
A transfer-type instrument is one that may be calibrated with a dc source and then used without modification to measure AC. This requires the transfer type instruments to have the same accuracy for both DC and AC. E.g., Electrodynamic or Dynamometer Type Instruments.

S5. Ans.(c)
Sol. Bridges used for measurement of inductance:
Anderson bridge (Q<1).
Maxwell bridge (1<Q<10).
Hay bridge (Q>10).

S6. Ans.(d)
Sol. Tellegen theorem can be applied to any network linear or non-linear, active or passive, time-variant or time-invariant.

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