NPCIL 2019 Exam paper
SA/ST
CAT-I (Electrical)
Question No. 1
The maximum
temperature permitted in Class A insulation is
A) 180° C B) 155° C
C) 120° C D) 105° C
Answer Key: D Your
Question
No. 2
MHCP in
illumination stands for
A) Median
Horizontal Candle Power B)
Mode Horizontal Candle Power
C) Mean
Horizontal Candle Power D)
Meridian Horizontal Candle Power
Answer Key:
C
Question No.
3
___________
states that a current will be induced in a conductor which is exposed to a
changing magnetic field.
A) Faraday’s
law B) Lenz’s law
C) Gauss’s
law D) Maxwell’s
law
Answer Key:
A
Question No.
4
A Cathode
Ray Oscilloscope gives __________ representation of the time varying signals.
A) Actual B)
Approximate
C) Visual D) Incorrect
Answer Key:
C
Question No.
5
________ Type
of lamp holder is fitted directly on the wooden board, which itself is fixed on
the wall
A) Bracket B) Angle
C) Pendant D) Batten
Answer Key:
D
Question No.
6
Which of the
following is/are the advantages of the parallel operation of an alternator?
A) Load
supply can be increased B) High
efficiency
C) Operating
cost is less D)
All of the options
Answer Key:
D
Question No.
7
A circuit
that contains a pure resistance connected in series with a coil having pure
inductance is known as
A) RLC
series circuit B)
RL series circuit
C) RC series
circuit D) LC
series circuit
Answer Key:
B
Question No.
8
If three
resistors of equal resistances (R) are connected in series, then the equivalent
resistance will be
A) 3R B) 1R
C) 0.666 R D) 0.333 R
Answer Key: A
Question No.
9
Which of the
following features of an induction motor helps in preventing cogging of the
motor?
A) High slip
B) Large number of
poles
C) Use of
better insulating materials D)
Skewed slots
Answer Key:
D
Question No.
10
Which of the
following does NOT affect resistance?
A) Mass B)
Resistivity
C)
Cross-sectional area D)
Length
Answer Key:
A
Question
No. 11
The Power
transformer is used to transfer _______ energy in any part of the electrical or
electronic circuit between the generator and the distribution primary circuits.
A) Mechanical B)
Electrical
C) Heat D) Chemical
Answer Key:
B
Question
No. 12
The
resolution of an indicating instrument is
A) The
smallest change in the output reading due to drifting of the pointer
B) The
smallest change in the input signal which can be detected by the instrument
C) The
difference between various readings for the same applied stimulus
D) To
faithfully indicate the value of the measured signal
Answer Key:
B
Question
No. 13
______ Theorem
states "A branch of a network carrying a current of I amperes can be
replaced by a voltage source of value IZ volts where Z is its branch impedance,
without affecting the other parts of the network".
A) Reciprocity B) Thevenin
C) Maximum power transfer D) Substitution
Answer Key:
D
Question
No. 14
Two electric
lamps of 30 W each are connected in parallel. What is the total power consumed?
A) 15 W B) 45 W
C) 60 W
D) 75 W
Answer Key:
C
Question
No. 15
Which of the
following single phase motor has the low starting and running torque?
A) Shaded
pole B) Reluctance
C)
Hysteresis D) Universal
Answer Key:
A
Question
No. 16
____ Law
states that the voltage induced in the coil is proportional to the rate of
change of lines of force that pass through the coil.
A) Biot-Savart's
B) Ohm's
C) Faraday's D) Lenz's
Answer Key:
C
Question
No. 17
______
Theorem is used to combine a number of voltage sources connected in parallel
into a single equivalent voltage source
A) Norton's B)
Tellegen's
C) Millman's D)
Thevenin's
Answer Key:
C
Question
No. 18
EPROM stands
for
A) Erasable
Programmable Read Only Memory
B) Editable
Programmable Read Only Memory
C) Editable
Programmable Random Only Memory
D) Erasable
Programmable Random Only Memory
Answer Key:
A
Question
No. 19
The residual
flux density is also known as
A) Residual
induction B) Residual magnetic
induction
C) Residual
magnetism D) All of the options
Answer Key:
D
Question
No. 20
RMS in terms
of electricity stands for
A) Root Mean
Sum B) Root Mean Square
C) Root
Maximum Sum D) Root Minimum Sum
Answer Key:
B
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