UPRVUNL’21 EE: Daily Practices Quiz 20-July-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.
QUIZ TIMING: 11 AM

Q1. No-load speed of which of the following motor is highest?
(a) Differentially compound motor
(b) Cumulative compound motor
(c) Series Motor
(d) Shunt Motor

Q2. Which of the following statement is true about the windings of a 2-windings transformer?
(a) Windings are conductively linked
(b) Windings are inductively linked
(c) Windings are not linked at all
(d) Windings are electrically linked

Q3. An ideal voltmeter has ___________ equivalent resistance and ideal ammeter has ___________ equivalent resistance.
(a) Unity, Unity
(b) Zero, infinite
(c) Infinite, Zero
(d) Zero, Zero

Q4. According to the IS code, the color of earth wire is usually:
(a) Yellow
(b) Green
(c) Red
(d) Black

Q5. If the secondary winding of the ideal transformer shown below has 40 turns, the number of turns in the primary winding for maximum power transfer to the 2 Ω resistor will be:

(a) 40
(b) 160
(c) 20
(d) 80

Q6. Parallel branch elements can be found out in a 1-phase transformer by conducting
(a) Open circuit test
(b) Short circuit test
(c) Both SC and OC test
(d) None of the above

SOLUTIONS
S1. Ans.(c)
Sol. At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is highest.

S2. Ans.(b)
Sol. in a 2-winding transformer, there is no electrical connection. Winding is linked inductively and the transformer works on the principle of EMI.

S3. Ans.(c)
Sol. An ideal voltmeter has Infinite equivalent resistance and an ideal ammeter has zero equivalent resistance.

S4. Ans.(b)
Sol.
earth wire—green
Neutral wire………black
Phase wire…………red

S5. Ans.(d)
Sol. For maximum power transfer to the 2 Ω resistor:
8=2×(N_1/N_2 )^2
∴N_1/N_2 =√4=2
⇒N_1=2N_2=2×40=80

S6. Ans.(a)
Sol. For determining shunt branch elements (R_c,x_m), we perform OC test at rated voltage.

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