Quiz: Electrical Engineering 13 Mar 2021

Quiz: Electrical Engineering
Exam: SSC JE
Topic: Miscellaneous

Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute

Q1. The secondary coil of an ideal 2:1 transformer has a 2 F capacitor connected across its terminals. The referred impedance on the primary side is of an element:
(a) L=8 H
(b) C=8 F
(c) L=0.5 H
(d) C=0.5 F

Q2. A 3 H inductor has 2000 turns. How many turns must be added to increase the inductance to 5 H?
(a) 582
(b) 2582
(c) 2500
(d) 1000

Q3. A 0-200 V voltmeter has an accuracy of 0.75% of full-scale reading. If voltage measured is 100 V, the error is:
(a) 3%
(b) 2%
(c) 1.5%
(d) .75

Q4. In the indirect method of lighting about how much percentage of light falls on the surface?
(a) 10 %
(b) 50 %
(c) 75 %
(d) 90 %

Q5. Lumen/ watt is the unit of
(a) Light flux
(b) Luminous intensity
(c) Brightness
(d) Luminous efficiency

Q6. DC average current of a half wave rectifier output is _
(Where I_m is the maximum peak current of input)
(a) 2Im/ᴨ
(b) Im/ᴨ
(c) Im/2ᴨ
(d) 1.414Im/ᴨ

Q7. Ripple factor of half wave rectifier is _
(a) 1.414
(b) 1.21
(c) 1.3
(d) 0.48

Q8. The pull-out torque of a practical synchronous motor will occur when the torque angle is about ………
(a) 0°
(b) 30°
(c) 45°
(d) 75°

Q9. For a given load, the normal field excitation of synchronous motor is that which gives ……. Power factor.
(a) 0.8 leading
(b) 0.8 lagging
(c) unity
(d) none of the above

Q10. For a given load, the armature current of a synchronous motor will be minimum for ………. Power factor.
(a) unity
(b) 0.8 leading
(c) 0.8 lagging
(d) none of the above

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