MCQ – Basic Electrical
1. The
voltage applied across an electric iron is halved. The power consumption of the
iron will be:
§ one-half
§ three-fourth
§ one-fourth
§ 1/√2times
2.
Resistance of 200w,250v lamp will be
§ 625 Ω
§ 1250Ω
§ 312.5Ω
§ 31.25Ω
3. 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:
§ 1000w
§ 500w
§ 250w
§ 2000w
4. A
200w, 100v lamp is to be operated on 250v supply. The additional resistance
required to be connected in series will be:
§ 125Ω
§ 50Ω
§ 75Ω
§ 25Ω
5.
Kirchoff’s laws are valid for
§ linear circuits only
§ passive time invariant
circuits
§ non-linear circuits only
§ both linear and
non-linear circuits
6. KCL
is applicable only to
§ electric circuits
§ electronic circuits
§ junctions in a network
§ closed loop in a network
7. KVL
is concerned with
§ IR drop
§ battery emf
§ junction node
§ both a and b
8. A
wye arrangement of resistances has each resistance of 3Ω, the equivalent delta
arrangement will have each resistance of values.
§ 9Ω
§ 6Ω
§ 3Ω
§ 1Ω
9. If
Q.8 resistor are connected in delta arrangement then the equivalent wye
will be 1Ω.
10. A
battery is connected to a resistance causing a current of 0.5A in the circuit.
The current drops to 0.4 when an additional resistance of 5Ω is connected in
series . The current will drop to 0.2A when the resistance is further increased
by
§ 10Ω
§ 15Ω
§ 25Ω
§ 40Ω
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