Q1:-The main purpose of oil in an oil circuit breaker is to ______.
(A) Prevent oxidation of movable and fixed contacts
(B) Extinguish the arc developed across the contacts
(C) Minimise the friction resistance between the movable and fixed contact
(D) Serve as a lubricant for the mechanical parts of the breaker
(E) None of these
ANSWER:-B
Q2:-The ratio of the R.M.S value to the average value of A.C is called:
(A) Permeability
(B) Specific resistance
(C) Form factor
(D) Armature reaction
(E) Susceptance
ANSWER:-C
Q3:-Which circuit breaker requires compressed air for its functioning?
(A) ACB
(B) ABCB
(C) OCB
(D) MCB
(E) None of these
ANSWER:-B
Q4:-On inspection, the commutator of a DC generator was found badly worn out. Sand papering is of no use. The best thing to do is to-
(A) Turn the commutator on a lathe
(B) Clean the commutator with CTC
(C) Replace the commutator
(D) Replace the armature
(E) None of these
ANSWER:-C
Q5:-In a step up transformer, the turns ratio is ____.
(A) 1
(B) < 1
(C) > 1
(D) None of these
(E) Any of (A),(B),(C)
ANSWER:-C
Q6:-Base and covers of the wiring accessories are made of:
(A) Ignitable material
(B) Non-ignitable material
(C) Conductive material
(D) Corrosion resistive material
(E) Heat resistive material
ANSWER:-B
Q7:-Underground cables are classified into 3 types according to their voltage capacity.
The voltage rating of HT cable is above 1.1 KV upto _____.
(A) 9.4 KV
(B) 11.0 KV
(C) 3.3 KV
(D) 6.6 KV
(E) 15.0KV
ANSWER:-B
Q8:-To prevent local action in battery, only _______ is used in electrolytes.
(A) Pump water
(B) Distilled water
(C) Tap water
(D) Both (A) and (C)
(E) Chlorinated water
ANSWER:-B
Q9:- Radius of bends used in conduit wiring should not be less than _____ MM.
(A) 8
(B) 64
(C) 50
(D) 5
(E) 4
ANSWER:-A
Q10:-MCB is more reliable than:
(A) Switches
(B) Fuses
(C) Circuit breakers
(D) Power sockets
(E) All of these
ANSWER:-B
Q11:-. When using a Megger , you must avoid touching -
(A) The positive lead
(B) The negative lead
(C) Both leads at the same time
(D) Either lead
(E) Same lead twice
ANSWER:-C
Q12:-. The disadvantage in underground cable system is:
(A) Frequent arcing grounds
(B) Difficult earth fault relaying
(C) Voltage oscillations
(D) All of these
(E) Only (A) and (B)
ANSWER:-APROX ANS:-B
Q13:-. Bending angle of the hard drawn bare copper conductor for Brittania joint should be:
(A) 60°
(B) 45°
(C) 90°
(D) 120°
(E) 180°
ANSWER:-C
Q14:-. A soft graphite brush has contact area of 5 sq cms and if the current density of the material is
9A/cm², how much current can it carry?
(A) 45 A
(B) 35 A
(C) 42 A
(D) 50 A
(E) 60 A
ANSWER:-A
Q15:-. A thermocouple is used to measure -
(A) Voltage
(B) High temperatures
(C) Potential difference
(D) Low temperatures
(E)Pressure
ANSWER:-B
Q16:-. Which of the following are types of resistors?
(A) Wire wound
(B) Carbon resistors
(C) Carbon metal film resistors
(D) (A), (B) & (C)
(E) None of these
ANSWER:-D
Q17:-. The wave form of the output voltage generated by an alternator is :
(A) Square wave
(B) Triangular wave
(C) Sawtooth wave
(D) Sinusoidal wave
(E) Linear wave
ANSWER:-D
Q18:-. The domestic voltage of 240V AC is called __________ voltage.
(A) Low tension voltage
(B) High tension voltage
(C) Earth
(D) Neutral
(E) Line voltage
ANSWER:-A
Q19:-. In an open circuit-
(A) Both resistance and current are zero
(B) Both resistance and current are infinity
(C) Resistance is zero and current is infinity
(D) Resistance is infinity and current is zero
(E) Resistance alone is infinity
ANSWER:-D
Q20:-. A wire measuring one mm diameter has a cross sectional area of ______.
(A) One mm²
(B) One cm²
(C) 0.78 mm²
(D) 0.87 mm²
(E) None of these
ANSWER:-C
(A) Prevent oxidation of movable and fixed contacts
(B) Extinguish the arc developed across the contacts
(C) Minimise the friction resistance between the movable and fixed contact
(D) Serve as a lubricant for the mechanical parts of the breaker
(E) None of these
ANSWER:-B
Q2:-The ratio of the R.M.S value to the average value of A.C is called:
(A) Permeability
(B) Specific resistance
(C) Form factor
(D) Armature reaction
(E) Susceptance
ANSWER:-C
Q3:-Which circuit breaker requires compressed air for its functioning?
(A) ACB
(B) ABCB
(C) OCB
(D) MCB
(E) None of these
ANSWER:-B
Q4:-On inspection, the commutator of a DC generator was found badly worn out. Sand papering is of no use. The best thing to do is to-
(A) Turn the commutator on a lathe
(B) Clean the commutator with CTC
(C) Replace the commutator
(D) Replace the armature
(E) None of these
ANSWER:-C
Q5:-In a step up transformer, the turns ratio is ____.
(A) 1
(B) < 1
(C) > 1
(D) None of these
(E) Any of (A),(B),(C)
ANSWER:-C
Q6:-Base and covers of the wiring accessories are made of:
(A) Ignitable material
(B) Non-ignitable material
(C) Conductive material
(D) Corrosion resistive material
(E) Heat resistive material
ANSWER:-B
Q7:-Underground cables are classified into 3 types according to their voltage capacity.
The voltage rating of HT cable is above 1.1 KV upto _____.
(A) 9.4 KV
(B) 11.0 KV
(C) 3.3 KV
(D) 6.6 KV
(E) 15.0KV
ANSWER:-B
Q8:-To prevent local action in battery, only _______ is used in electrolytes.
(A) Pump water
(B) Distilled water
(C) Tap water
(D) Both (A) and (C)
(E) Chlorinated water
ANSWER:-B
Q9:- Radius of bends used in conduit wiring should not be less than _____ MM.
(A) 8
(B) 64
(C) 50
(D) 5
(E) 4
ANSWER:-A
Q10:-MCB is more reliable than:
(A) Switches
(B) Fuses
(C) Circuit breakers
(D) Power sockets
(E) All of these
ANSWER:-B
Q11:-. When using a Megger , you must avoid touching -
(A) The positive lead
(B) The negative lead
(C) Both leads at the same time
(D) Either lead
(E) Same lead twice
ANSWER:-C
Q12:-. The disadvantage in underground cable system is:
(A) Frequent arcing grounds
(B) Difficult earth fault relaying
(C) Voltage oscillations
(D) All of these
(E) Only (A) and (B)
ANSWER:-APROX ANS:-B
Q13:-. Bending angle of the hard drawn bare copper conductor for Brittania joint should be:
(A) 60°
(B) 45°
(C) 90°
(D) 120°
(E) 180°
ANSWER:-C
Q14:-. A soft graphite brush has contact area of 5 sq cms and if the current density of the material is
9A/cm², how much current can it carry?
(A) 45 A
(B) 35 A
(C) 42 A
(D) 50 A
(E) 60 A
ANSWER:-A
Q15:-. A thermocouple is used to measure -
(A) Voltage
(B) High temperatures
(C) Potential difference
(D) Low temperatures
(E)Pressure
ANSWER:-B
Q16:-. Which of the following are types of resistors?
(A) Wire wound
(B) Carbon resistors
(C) Carbon metal film resistors
(D) (A), (B) & (C)
(E) None of these
ANSWER:-D
Q17:-. The wave form of the output voltage generated by an alternator is :
(A) Square wave
(B) Triangular wave
(C) Sawtooth wave
(D) Sinusoidal wave
(E) Linear wave
ANSWER:-D
Q18:-. The domestic voltage of 240V AC is called __________ voltage.
(A) Low tension voltage
(B) High tension voltage
(C) Earth
(D) Neutral
(E) Line voltage
ANSWER:-A
Q19:-. In an open circuit-
(A) Both resistance and current are zero
(B) Both resistance and current are infinity
(C) Resistance is zero and current is infinity
(D) Resistance is infinity and current is zero
(E) Resistance alone is infinity
ANSWER:-D
Q20:-. A wire measuring one mm diameter has a cross sectional area of ______.
(A) One mm²
(B) One cm²
(C) 0.78 mm²
(D) 0.87 mm²
(E) None of these
ANSWER:-C
No comments:
Post a Comment