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UPPCL-JE’21 EE: Daily Practices Quiz 09-Dec-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 09-Dec-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min.

Q1. Which of the following type of wattmeters is used only on AC?
(a) Induction type wattmeter
(b) Dynamometer type suspended-coil torsion wattmeter
(c) Dynamometer type pivoted-coil direct reading wattmeter
(d) Electrostatic type wattmeter

Q2. Which of the following is a “voltage-controlled” device?
(a) SCR
(b) MOSFET
(c) NPN transistor
(d) PNP transistor

Q3. Form factor is the ratio of
(a) Average value to rms value
(b) Rms value to average value
(c) Peak value to average value
(d) Peak value to rms

Q4. Peak factor is the ratio of
(a) Average value to rms value
(b) rms value to average value
(c) maximum value to average value
(d) maximum value to rms value

Q5. The transformer used for AC welding sets is
(a) Booster type
(b) Step up type
(c) Step down type
(d) Equal turn ratio type

Q6. A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is
(a) 0 V
(b) 20 V
(c) 40 V
(d) 60 V

SOLUTIONS

S1. Ans.(a)
Sol. Induction type wattmeters only measure AC power.

S2. Ans.(b)
Sol.

Voltage controlled FET, MOSFET, IGBT
Current controlled BJT
Phase controlled SCR, TRIAC

S3. Ans.(b)
Sol. Form factor is the ratio of Rms value to average value.

S4. Ans.(d)
Sol. Peak factor is the ratio of maximum value to rms value.

S5. Ans.(c)
Sol. Step down type.

S6. Ans.(c)
Sol. in case of generator: Eg=Vt+Ia Ra
In case of motor: Eb=Vt-Ia Ra
∴Eg-Eb=2Ia Ra=2×20×1=40 V

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