Applied Electricity Mock 2025

Question 1 of 50

A semiconductor device that allows current to flow in one direction only is a

Question 2 of 50

Changing a.c. into d.c. is called

Question 3 of 50

In a three-pin plug, the green/yellow wire is connected to the

Question 4 of 50

The SI unit of electric charge is the

Question 5 of 50

The SI unit of power is the

Question 6 of 50

Which instrument measures resistance directly?

Question 7 of 50

A 12 V battery supplies 3 A. How much power does it deliver?

Question 8 of 50

A transformer with more secondary turns than primary turns is a

Question 9 of 50

An AC supply has a frequency of 50 Hz. What is its period?

Question 10 of 50

The three terminals of a bipolar junction transistor are

Question 11 of 50

A circuit that converts AC to DC is a

Question 12 of 50

A person receiving an electric shock should first be

Question 13 of 50

Conduit pipes in wiring are used to

Question 14 of 50

The instrument used to measure current is the

Question 15 of 50

A 12 V battery drives 3 A through a resistor. The resistance is

Question 16 of 50

Resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. The total resistance is

Question 17 of 50

In a parallel circuit, the voltage across each branch is

Question 18 of 50

A step-down transformer has

Question 19 of 50

The three terminals of a bipolar transistor are

Question 20 of 50

Adding impurities to pure silicon to change its conductivity is called

Question 21 of 50

In a three-pin plug, the fuse is connected in the

Question 22 of 50

Switches in domestic wiring should be connected in the

Question 23 of 50

Conductance is the reciprocal of resistance and is measured in

Question 24 of 50

The resistance of a wire increases when its

Question 25 of 50

Three 6 Ω resistors are connected in parallel. What is the total resistance?

Question 26 of 50

A short circuit causes

Question 27 of 50

The rule used to find the direction of the induced current in a generator is

Question 28 of 50

The part of a DC machine that carries the armature winding and rotates is the

Question 29 of 50

Carbon brushes in a DC motor

Question 30 of 50

In a purely resistive AC circuit, the current and voltage are

Question 31 of 50

A Zener diode is mainly used for

Question 32 of 50

In domestic wiring, switches should be connected in the

Question 33 of 50

One kilowatt-hour is equal to

Question 34 of 50

The rule used to find the direction of force on a current-carrying conductor in a motor is

Question 35 of 50

The part of a d.c. motor that reverses the current in the coil every half turn is the

Question 36 of 50

An insulation resistance test is carried out with a

Question 37 of 50

A Wheatstone bridge has arms 10 Ω, 20 Ω, 15 Ω and X. At balance with 10/20 = 15/X, X is

Question 38 of 50

A transformer has 2% copper loss and 1% iron loss at full load. Its efficiency is about

Question 39 of 50

The voltage gain of an amplifier with output 2 V for input 20 mV is

Question 40 of 50

Voltage drop in a long cable can be reduced by

Question 41 of 50

A charge of 30 C flows past a point in 6 s. The current is

Question 42 of 50

The resistance of a wire is doubled when its

Question 43 of 50

The resistance of a copper wire is 4 Ω at 20 °C. If α = 0.004 /°C, its resistance at 70 °C is

Question 44 of 50

Two wires of the same material: B is twice as long and has twice the diameter of A. R_B/R_A is

Question 45 of 50

Using the superposition theorem, each source is considered

Question 46 of 50

The slip of an induction motor with synchronous speed 1,500 rpm running at 1,440 rpm is

Question 47 of 50

In an RLC series circuit at resonance, the current is

Question 48 of 50

Apparent power of 5 kVA at power factor 0.6 gives a reactive power of

Question 49 of 50

A silicon diode in series with a 1 kΩ resistor across 5.7 V carries a current of

Question 50 of 50

A copper wire's resistance increases with