UPPCL-JE’21 EE: Daily Practices Quiz 08-Nov-2021

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UPPCL-JE’21 EE: Daily Practices Quiz

UPPCL-JE’21 EE: Daily Practices Quiz 08-Nov-2021

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

Q1. A ballistic galvanometer is calibrated to measure
(a) Current
(b) Voltage
(c) Resistance
(d) Charge

Q2. Slip rings and brushes are found in
(a) Wound rotor
(b) Squirrel cage rotor
(c) Both of the above
(d) None of the above

Q3. Creeping is a term related to instruments?
(a) PMMC type
(b) Dynamometer type
(c) Induction type
(d) Moving iron type

Q4. Which of the following speed control method of a DC machine is NOT a constant torque drive?
(a) Armature resistance control
(b) Armature voltage control
(c) Field flux control
(d) All of the above

Q5. In a transformer the voltage regulation will be zero when it operates at:
(a) Lagging pf
(b) Leading pf
(c) Unity pf
(d) Zero pf leading

Q6. For eliminating n^th harmonic from emf generated in the phase of 3-phase alternator, the chording angle should be:
(a) 1/n×full pitch
(b) n ×full pitch
(c) 2/n×full pitch
(d) 3/n×full pitch

SOLUTIONS

S1. Ans.(d)
Sol. The galvanometer which is used for estimating the quantity of charge flow through it is called the ballistic galvanometer.
For Ballistic galvanometer, q α Ө.

S2. Ans.(a)
Sol. Wound or slip ring rotor.

S3. Ans.(c)
Sol. The slow but continuous rotation of the energy meter (Induction type) when only the pressure coil is excited and no current is flowing through the current coil is called creeping.

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