Quiz: Electrical Engineering
Exam: NPCIL
Topic: Miscellaneous
Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute
Q1. The armature torque of the DC shunt motor is proportional to
(a) Field Flux Only
(b) Armature current Only
(c) Both (a) and (b)
(d) None of the Above
L1Difficulty 2
QTags DC Machine
QCreator Balwant Kumar
Q2. Due to magnetostriction, which one of the following problems occurs in the Transformer?
(a) Oil leakage
(b) Humming Sound
(c) Speed destruction
(d) No problem occurs
L1Difficulty 1
QTags Transformer
QCreator Balwant Kumar
Q3. A device having characteristic very close to that of ideal voltage source is…
(a) Vacuum diode
(b) Zener Diode
(c) Transistor
(d) FET
L1Difficulty 1
QTags Analog Electronics
QCreator Balwant Kumar
Q4. Rectifier instrument indicates
(a) RMS value
(b) Peak value
(c) Average value
(d) None of these
L1Difficulty 2
QTags Analog Electronics
QCreator Balwant Kumar
Q5. A terminal where three or more branches meet is known as
(a) loop
(b) node
(c) mesh
(d) Terminus
L1Difficulty 2
QTags Network theorems
QCreator Balwant Kumar
Q6. The armature of a single-phase alternator is completely wound with T single turn coils distributed uniformly. The induced voltage in each turn is 3 Volts (rms). The emf of whole winding
(a) 2.56 T Volt
(b) 2.11 T Volt
(c) 1.11 T Volt
(d) 1.909 T Volt
L1Difficulty 2
QTags Alternators
QCreator Balwant Kumar
Q7. Power factor of a parallel RLC circuit at resonance is:
(a) Unity
(b) Zero
(c) 0.0707 Leading
(d) 0.707mLagging
L1Difficulty 1
QTags Network theorems
QCreator Balwant Kumar
Q8. A generated Voltage is equally dependent on three resistances and its value V
If tolerance of each resistor is 0.1 %, What will be the maximum error in voltage?
(a) 0.40%
(b) ±0.40 %
(c) ±0.30 %
(d) None Of the above
L1Difficulty 1
QTags Measurement And instrumentation
QCreator Balwant Kumar
Q9. If the speed of a DC shunt motor is increased, the back emf of the motor will
(a) Increase
(b) Decrease
(c) Remain same
(d) Become Zero
L1Difficulty 1
QTags DC Machine
QCreator Balwant Kumar
Q10. In a photo diode, light is focused to fall on
(a) p-region only
(b) n-region only
(c) Full p and n region
(d) Junction region only
L1Difficulty 1
QTags Analog Electronics
QCreator Balwant Kumar
Solution
S1. Ans. (b)
Sol. For DC Shunt motor
S2. Ans. (b)
Sol. Humming Sound
S3. Ans. (b)
Sol. Zener Diode is having characteristic very close to that of ideal voltage source.
S4. Ans. (a)
Sol. Rectifier instrument indicates RMS value.
S5. Ans. (d)
Sol. A terminal where three or more branches meet is known as Terminus or Junction.
S6. Ans. (d)
Sol. Distribution factor Kd = =
= 2/π
E’ = Kd.N.E = . T. 3 = 1.909 T
S7. Ans. (a)
Sol. Power factor of a parallel RLC circuit at resonance is Unity as the impedance becomes purely resistive during resonance.
S8. Ans. (c)
Sol. Maximum error in the voltage can be represented by
S9. Ans. (a)
Sol. As per the relation
S10. Ans. (d)
Sol. In a photo diode, light is focused to fall on Junction region only.
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