Top 100 MCQ Capacitor
Capacitor: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of Capacitor
41.The units of capacitance are
A. Volts/coulomb
B. Coulombs/volt
C. Henry/wb
D. Ohms
Ans. B
42The capacitance of a capacitor is not affected by
A. Distance between plates
B. Area of plates
C. Thickness of plates
D. All of the above
43.Capacitance increases with
A. Increase in plate area and decrease in distance between the plates
B. Increase in the plate area and distance between the plates
C. Decrease in the plate area and value of applied voltage
D. Reduction in plate area and distance between the plates
Ans. A
44..The inverse of capacitance is called
A. Reluctance
B. Conductance
C. Susceptance
D. Elastance
Ans. D
45.The capacitance of a capacitor is influenced by
A. Plat area
B. Plate separation
C. Nature of dielectric
D. All of the above
Ans. D
46.The capacitance between two plates increases with
A. Shorter plate area and higher applied voltage
B. Shorter play area and shorter distance between them
C. Larger plate area, longer distance between plates and higher applied voltage
D. Larger plate area and shorter distance between plates
Ans. D
47.he capacitance C is charged through a resistor R. The time constant of the charging circuit is given by
A. C/R
B. 1/RC
C. RC
D. R/C
Ans. C
48.The capacitance of 1 μF equals
A. 10 -12 F
B. 10-8 F
C. 10-6 F
D. 10-4 F
Ans. C
49.The capacitance is a circuit component that oppose the change in circuit
A. Current
B. Voltage
C. Impedance
D. None of the above
Ans. B
50.The ohmmeter reading for a short circuited capacitor is
A. Infinity
B. Few kilo ohms
C. Few megaohms
D. Zero
Ans. D
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Top 100 MCQ Battery
Battery: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of battery
91.Internal resistance of a cell is due to
A. Resistance of electrolyte
B. Electrode resistance
C. Surface contact resistance between electrode and electrolyte
D. All of the above
Ans. D
92. If the battery is wrongly connected on charge following will happen
A. Current delivered by the battery will be high
B. Current drawing will be Nil
C. Currently drawing will be very small
D. Currently drawing will be very high
Ans. D
93.Battery charging room is to be kept well ventilated so as to reduce the hydrogen concentration below……… percent
A. One
B. Two
C. Three
D. Four
Ans. C
94. Under normal charging rate, the charging current show to be
A. 10% of capacity
B. 20% of capacity
C. 30% of capacity
D. 40% of capacity
Ans. A
95.Trickle charge is required for
A.. Primary cells
B. Lead acid batteries
C. Nickel iron cells
D. All of the above
Ans. D
96.The output voltage of a charger is
A. Less than the battery voltage
B. Higher than the battery voltage
C. The same as the battery voltage
D. None of the above
Ans. B
97.It is noticed that during charging
A. There is a rise in voltage
B. Energy is absorbed by the cell
C. Specific gravity of H2 SO4 is increased
D. All of the above
Ans. D
98.Overcharging ……..
A. Produces excessive gassing
B. Loosens the active material
C. Increases the temperature resulting in buckling of plates
D. All of the above
Ans. D
99.Under charging …….
A. Reduces specific gravity of the electrolyte
B. Increases specific gravity of the electrolyte
C. Produces excessive gassing
D. Increases the temperature
Ans. A
100.In ……..system the charging current is intermittently controlled at either a maximum or minimum value
A. Two rate charge control
B. Trickle charge
C. Floating charge
D. An equalizing charge
Ans. A
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Top 100 MCQ Battery
Battery: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of battery
81.Trickle charger of a storage battery helps to
A. Maintain proper electrolyte level
B. Increase its reverse capacity
C. Prevent sulphation
D. Keep it fresh and fully charged
Ans. D
82.On over charging a battery
A. It will bring about chemical change in active materials
B. It will increase the capacity of the battery
C. It will raise the specific gravity of the electrolyte
D. None of the above
Ans. D
83.Battery charging equipment is generally installed
A. In well ventilated location
B. In clean and dry place
C. As near as practical to the battery being charged
D. In location having all above features
Ans. D
84. Batteries are charged by
A. Rectifiers
B. Engine generator sets
C. Motor generator sets
D. Any of the above
Ans. D
85.Battery container should be acid resistance therefore it is made up of
A.Glass
B. Plastic
C. Wood
D. All of the above
Ans. D
86.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
Ans. D
87.Ampere hour capacity of an industrial battery is based on ……….hours discharge rate
A. 8
B. 12
C. 16
D. 24
Ans. A
88.A battery of six cells will show a drop of ……..volts from fully charged state to fully discharged state
A. 1
B. 1.5
C. 2.4
D. 2.9
Ans. C
89.Which of the following battery is used for aircraft?
A. Lead acid battery
B. Nickel-iron battery
C. Dry cell battery
D. Silver oxide battery
Ans. B
90. When two batteries are connected in parallel, it should be ensured that
A. They have same emf
B. They have same make
C. They have same ampere hour capacity
D. They have identical internal resistance
Ans. A
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Top 100 MCQ Battery
Battery: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of battery
71.In a lead acid battery during charging
A. Specific gravity of acid increases
B. Voltage drops
C. Anode becomes white in colour
D. The cell gives out energy
Ans. A
72.A lead acid battery, even when not in use, should be recharged once in
A. Ten days
B. Three weeks
C. Six weeks
D. Six months
Ans. C
73.Sedimentation in lead acid batteries occurs due to
A. Slow charging at a low rate
B. Overcharging at high rate
C. Non-utilization for longer periods
D. Over discharging at slow rate
Ans. B
74.In a lead acid cell, hydrogen is liberated at
A. Positive plate
B. Negative plate
C. Both positive and negative plates
D. None of the above
Ans. B
75.The current flow through electrolyte is due to the movement of
A. Ions
B. Holes
C. Electrons
D. None of the above
Ans. A
75. Level of electrolyte in a cell should be ……..the level of plates
A. Below
B. Equal to
C. Above
D. None of the above
Ans. C
76 …….. Of electrolyte indicates the state of charge of the battery
A. Colour
B. Mars
C. Viscosity
D. Specific gravity
Ans. D
77.While preparing electrolyte for a lead acid battery
A. Water is poured into acid
B. Acid is poured into water
C. Anyone of the two can be added to other chemical
D. None of the above
Ans. B
78.Electrolyte for silver plating is
A. Potassium nitrate solution
B. Dilute sulphuric acid
C. Double cyanide of silver and potassium solution
D. Any of the above
Ans. C
79.The capacity of a battery is expressed in terms of
A. Current rating
B. Voltage rating
C. Ampere hour rating
D. None of the above
Ans. C
80.The storage battery generally used in electric power station is
A. Nickel-cadmium battery
B. Zinc carbon battery
C. Lead-acid battery
D. None of the above
Ans. C
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