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Basic Electrical |
1. The ratio of voltage and electric current in a closed circuit_________.
a. remains constant
b. varies
c. increases
d. falls
2. The curve representing ohm's law is________.
a. sine function
b. Linear
c. a parabola
d. a hyperbola
3. The resistance of a conductor having length 'l' area of cross-section 'a' and resistivity 'ρ' is given as______.
a. ρa/l
b. ρl/a
c. ρla
d. l/ρ
4. The resistance of wire varies inversely as_________.
a. area of cross-section
b. length
c. resistivity
d. temperature
5. Which of the following quantities are the same in all parts of a series circuit?
a. voltage
b. power
c. current
d. resistance
6. Which of the following statements is false in case of a series circuit?
a. the voltage drop across each resister is same
b. the current flowing through each resistor is the same
c. applied voltage is equal to the sum of voltage drops across individual resistors are additive
d. none
7. A resistance of 30 ohms is connected across the 240v supply. If a resistance R ohm is connected in parallel with a 30 ohms resistor across the same supply, the current drawn becomes triple of the original one of the unknown resistor R is_________.
a. 15 ohms
b. 10 ohm
c. 5 ohm
d. 30 ohms
8. Three resistors, each of R ohms, are connected to form a triangle. The resistance between any two terminals will be________.
a. 2R/3
b. 3R/2
c. R
d. 3R
9. Which of the following is not correct?
a. P=V/R^2
b. P=VI
c. I=√ (P/R)
d. V=√PR
10. A 100W bulb is connected in series with a room heater. If now 100W bulb is replaced by a 40w bulb, the heater output will _________.
a. increase
b. decrease
c. remain the same
d. heater breakdown
11. The voltage applied across an electric iron is halved. The power consumption of the iron will be_____.
a. one-half
b. one-fourth
c. 1/√2times
d. three-fourth
12. Resistance of 200w, 250v lamp will be______.
a. 625 ohm
b. 1250 ohm
c. 312.5 ohm
d. 31.25 ohm
13. Two heaters rated at 1000w, 250v each are connected in series across a 250v, 50Hz ac supply. The total power drawn from the supply will be___________.
a. 1000 w
b. 500 w
c. 250 w
d. 2000 w
14. A 200w, 100v lamp is to be operated on 250v supply. The additional resistance required to be connected in series will be_______.
a. 125 ohms
b. 50 ohms
c. 75 ohms
d. 25 ohms
15. Kirchhoff's laws are valid for________.
a. passive time invariant circuits
b. linear circuit only
c. non-linear circuits only
d. both linear and non-linear circuits
16. Kirchhoff’s current law is applicable to only________.
a. Junction in a network
b. Closed loops in a network
c. Electric circuits
d. Electronic circuits
17. KVL is concerned with_____.
a. IR drop
b. battery emf
c. junction node
d. both a and b
18. A wye arrangement of resistances has each resistance of 3ohm, the equivalent delta arrangement will have each resistance of values______.
a. 9 ohms
b. 6 ohms
c. 3 ohm
d. 1 ohm
19. Cells are connected in series in order to increase the______.
a. current capacity
b. life of the cells
c. voltage rating
d. terminal voltage
20. Cells are connected in parallel in order to increase______.
a. life of the cells
b. efficiency
c. current capacity
d. voltage rating
21. When two cells are connected in parallel, it should ensure that have_______.
a. they have same e.m.f.
b. they have same make
c. they have same ampere-hour capacity
d. they have identical internal resistance
22. The capacity of a battery is expressed in________.
a. amperes
b. amperes-hour
c. watts
d. watt-hour
23. A series resonant circuit implies______.
a. zero pf and maximum current
b. unity pf and maximum current
c. unity pf and minimum current
d. zero pf and minimum current
24. which one is classified as integrating instrument?
a. D'arsonval galvanometer
b. ampere-hour meter
c. ohm-meter
d. ammeter
25. Which of the following types of instrument is an integrating instrument?
a. power factor meter
b. energy meter
c. watt meter
d. frequency meter
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