ELECTRICAL ENGINEERING

UPSC CSE Electrical Engineering Syllabus

UPSC Exam Syllabus- Electrical Engineering

ELECTRICAL ENGINEERING MCQs

1. According to BIS and NEC, the clearance between the bottom point of the ceiling fan and the floor shall not be less than
A:-2.5m
B:-2.75m
C:-2.25m
D:-2.4m
Ans: D

2. If firing angle in an SCR rectifier is increased, the output is
A:-remains same
B:-SCR is turned off
C:-decreased
D:-increased
Ans: C

3. Which electrode of the CRT mainly controls the brightness of the image on the screen?
A:-Anode
B:-Cathode
C:-Control grid
D:-Focusing electrodes
Ans: C

4. Efficiency of a transformer is maximum, when
A:-no load loss is equal to full load loss
B:-hysteresis loss is equal to eddy current loss
C:-copper loss is equal to eddy current loss
D:-copper loss is equal to iron loss
Ans: D

5. For the parallel operation of two transformers, the phase sequence must be identical, otherwise, during the cycle
A:-when secondaries are loaded, it will produce unequal loading conditions
B:-impossible to take the full load output without excessive heating of one of the transformer
C:-each pair of phases will be open circuited
D:-each pair of phases will be short circuited
Ans: D

6. A two layer lap wound 4 pole generator with 16 coils will have a pole pitch of
A:-32
B:-16
C:-8
D:-4
Ans: C

7. The maximum safe temperature for class F insulating material is
A:-155°C
B:-130°C
C:-120°C
D:-180°C
Ans: A

8. The ratio of intensity of magnetisation to the magnetising force is known as
A:-permeability
B:-permittivity
C:-susceptibility
D:-magnetic potential
Ans: C

9. While testing the field coil connections by compass method, the DC voltage to be applied to the field coil is
A:-10 to 20% of rated voltage
B:-the rated voltage
C:-60 to 70% of rated voltage
D:-200% of rated voltage
Ans: A

10. The relays which are capable of maintaining their contacts in the last assumed position after the power is cut off are
A:-latching relays
B:-thermal relays
C:-reed relays
D:-elctro-mechanical relays
Ans: A

11. In large motor generator sets, the AC motor used is usually
A:-squirrel cage type induction motor
B:-wound rotor type induction motor
C:-synchronous motor
D:-universal motor
Ans: C

12. A watt meter measures the
A:-Apparent power
B:-Active power
C:-Reactive power
D:-Power factor
Ans: B

13. A series resonant circuit is known as acceptor circuit, because its ______ will be maximum
A:-voltage
B:-current
C:-power factor
D:-frequency
Ans: B

14. With two watt meter method of 3 phase power measurement, if one watt meter gives negative indication, then, the power factor will be
A:-unity
B:-zero
C:-more than 0.5
D:-less than 0.5
Ans: D

15. A moving coil milliammeter having a resistance of 10 ohm gives full scale deflection, when a current of 5mA is passed through it. If the instrument to be used to measure a current up to 1A, then
A:-a resistance of 0.502 ohm must be connected in series with the ammeter
B:-a resistance of 0.502 ohm must be connected in series with the load
C:-a resistance of 0.502 ohm must be connected in parallel to the ammeter
D:-a resistance of 0.502 ohm mus be connected in parallel to the load
Ans: C

16. The instrument which give the value of quantity to be measured in terms of deflection and instrument constants are
A:-secondary instruments
B:-indicating instruments
C:-integrating instruments
D:-absolute instruments
Ans: D

17. A measuring instrument is enclosed inside an iron case. This is for protecting the measuring mechanism from
A:-heat
B:-magnetic flux
C:-static electricity
D:-hysteresis effect
Ans: B

18. The cell voltage of a Lithium cell is
A:-2.1 to 2.6V
B:-2.5 to 3.6V
C:-1.2 to 1.4 V
D:-1.5V
Ans: B

19. The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. This statement is associated with
A:-Macbeth's law of illumination
B:-Bunsen's law of illumination
C:-Lambert's cosine law
D:-Plank's law
Ans: C

20. In a drill, ______ helps to form the cutting edge.
A:-Land
B:-Shank
C:-Tang
D:-Flutes
Ans: D

21:-Recommended current density for a copper bus bar which is unenclosed should not exceed
A:-165 A/sq. cm
B:-118 A/sq. cm
C:-178 A/sq. cm
D:-135 A/sq. cm
Ans: A