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UPRVUNL’21 EE: Daily Practices Quiz 02-Aug-2021

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

Q1. If the conductor radius increases, inductance of the line-
(a) increases
(b) decreases
(c) remains same
(d) may increase or decrease

Q2. Cumulatively compounded motors are used where we require ………
(a) variable speed
(b) poor speed regulation
(c) sudden heavy loads for short duration
(d) none of the above

Q3. A parallel resonance……….
(a) circuit impedance is minimum
(b) power factor is zero
(c) line current is maximum
(d) power factor is unity

Q4. What will be the value of susceptibility when the curie constant value is 0.2 and the difference in critical temperature and paramagnetic Curie temperature is 0.01?
(a) 2
(b) 200
(c) 0.02
(d) 20

Q5. In FET, the current flow is mainly due to
(a) Majority carriers
(b) Minority carriers
(c) Both a and b
(d) None of the above

Q6. Candela is the unit of
(a) Luminous flux
(b) Luminous intensity
(c) Wavelength
(d) Frequency

SOLUTIONS

S1. Ans.(b)
Sol. Inductance of a line.
L = 2×10-7 ln[GMD/GMR] H/m/phase
and. GMR α Radius of the conductor
If radius increases then GMR will increase and inductance will decrease.

S2. Ans.(c)
Sol. Cumulatively compounded motors are used where we require sudden heavy loads
for short duration.

S3. Ans.(d)
Sol. In parallel resonance condition:
Circuit impedance is maximum. Hence, current will be minimum.
Power factor unity

S4. Ans.(d)
Sol. The magnetic susceptibility(x_m )=C/(T-Ө)
Where, C = curie constant = 0.2
T = Critical Temperature
θ = Curie Temperature
The difference in critical temperature and paramagnetic Curie temperature is (T − θ) = 0.01
∴x_m=C/(T-Ө)=0.2/0.01=20

S5. Ans.(a)
Sol. A unipolar transistor is a field effect transistor (FET) that uses only one type of charge for conduction from drain to source i.e., either electrons (n-channel FET) or holes (P-channel FET).
In FET, the current flow is mainly due to majority carriers.

S6. Ans.(b)
Sol. The candela is the SI unit of luminous intensity.

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