RRB JE Electrical (CBT II) Mock Test- 2 - Electrical Engineering (EE) MCQ

Booting is a startup sequence that starts the operating system of a computer when it is turned on. A boot sequence is the initial set of operations that the computer performs when it is switched on. Every computer has a boot sequence.

The capacitance of a capacitor is Q/V, which implies 0.5/10 = 0.05c

A character encoding scheme is true with respect to ASCII. ASCII stands for American Standard Code for Information Interchange. Computers can only understand numbers, so an ASCII code is the numerical representation of a character such as 'a' or '@' or an action of some sort.

Different welding accessories are-
1. Clamps & Jacks.
2. Earth Clamps & Cable.
3. Hazard Protection.
4. MIG Argon +5.
5. Plugs & Adaptors.
6. Welding Tables.
7. Hand screen.
8. Electrode holder
9. Gloves & Gauntlets.
10. Plugs / Sockets.

Given that, Voltage (V₁) = 200 V
Power (P₁) = 100 W
We know that, P = V²/R
⇒ R = 200²/100 = 400Ω
Now it is connected to 100 V source.
P = 100²/100 = 25W

We know that, in a dc motor

As voltage applied across its armature is increased by 10%, back emf also gets increased by 10%.
As flux is constant and speed is directly proportional to back emf, speed also gets increased by 10%.

When single phase AC supply is given to stator winding, it produces alternating flux i.e. which alternates along one space axis only.

It is not synchronously revolving (or rotating) flux, thus it cannot produce any rotation. Hence single phase induction motor is not self-starting.

Batten Holder: This type of lamp holder is fitted directly on the wooden board, which itself is fixed on the wall. The lamp is then supported in the batten holder.

Pendant Holder: When the bulb is to be suspended from the ceiling rose, this type of holder has to be used for holding the lamp.

Angle Holder: Angle holders are used when the light of the lamp is needed at a certain angle. These are directly fixed to the walls.

Bracket Holders: These are used where direct light is needed in the room. These are also used on table lamps. Brackets used with such type of holders are made of brass material.

Noise pollution may cause or contribute to the following adverse effects:

• anxiety, stress, nervousness, nausea, headache,
• emotional instability,
• argumentativeness,
• increase in social conflicts
• depression and fatigue
• Insomnia as a result of lack of undisturbed and refreshing sleep

• A web browser is a software application for accessing information on the World Wide Web
• URL is an acronym for Uniform Resource Locator, It is a reference to the resource on the internet
• A client is a computer that connects to and uses the resources of a remote computer, or server
• The server handles the request from the web browser and sends back a response to build a connection to provide web services
• Cookies are messages that web servers pass to the web browser when user visit Internet sites

• Acetic acid, commonly named ethanoic acid, is a colorless liquid organic compound with the chemical formula CH₃COOH.
• When undiluted, it is sometimes called glacial acetic acid.

Fly ash, also known as "pulverised fuel ash" is a coal combustion product composed of fine particles that are driven out of the boiler with the flue gases in thermal power plant.

Given that, V(t) = 12t²

We know that,

I = ∫12t²dt = 4t³

No load saturation characteristics:

Open circuit characteristic is also known as a magnetic characteristic or no-load saturation characteristic.

This characteristic shows the relation between generated emf at no load (E0) and the field current (If) at a given fixed speed.

Internal or Total Characteristic (E/Ia):

The on-load generated emf (Eg) and the armature current (Ia).

External Characteristic (V/IL):

An external characteristic curve shows the relation between the terminal voltage (V) and the load current (IL).

• Metal graphite brushes are used for higher values of current density.
• Metal graphite brushes are generally made from natural graphite and fine metal powders
• It is ideal for a variety of applications because of their low resistivity.
• It is used on commutators of plating generators where low voltage and high brush current densities are encountered

If we apply a voltage at the primary terminals of a transformer then for this, we can get a voltage at the secondary. But they have 180-degree phase difference.

In a series RLC circuit, the applied voltage is phasor sum of voltage existing across all these elements
let the total applied voltage is V and the voltage applied across R, L and C are V_R, V_L, and V_C respectively.

Now, 
Given that, V_R = 300 V, V_L = 100 V, V_C = 500 V

Hence, A is true, but R is false.

The voltmeter is connected in parallel with an ammeter
The ideal resistance of ammeter is zero, Hence voltage drop across it (IR=0)
Thus voltmeter shows 0 reading

Conditions to build up the voltage in shunt generator:

• The shunt winding should have a residual magnetic field
• The direction of the shunt winding and armature winding should be in such a way that flux generated by them should aid together
• The shunt winding should have critical winding resistance

Voltage building in shunt generator:

When the armature is rotated, the residual flux in the field winding will induce a small voltage in the armature. The induced voltage in armature generates a flux and it will aid with field flux and the net flux will increase further. This process will be repeating until the actual terminal voltage is reached.

Power Factor is a ratio of the real power and apparent power flowing in the circuit.

Power factor = Realmpower/Apparent power = R/Z = V _R/V
cosϕ = 100/125 = 0.8
Important:
Active power (measured in Watt) is actual power or true power which does the useful work. (so, most of the equipment’s which consume electricity or electric power are rated in terms of Watt or HP)
Reactive power (measured in Volt-Ampere- Reactive) is imaginary power which is required for the processes like energy conversion & energy storage. (so, the equipment’s which generate only reactive power are rated in terms of VAr. e.g. capacitor banks for pf correction)
Apparent power (measured in terms of Volt-Ampere) is total power. And is combination of active and reactive powers

• Jordan has unveiled its first underwater military museum off the coast of Aqaba.
• The vehicles, including tanks, troop carriers and a helicopter, imitating a battle formation, have been stationed at a coral reef in the Red Sea.
• Aqaba is the lone port city of Jordan and is a popular destination for divers.

Given:
Open circuit voltage = V_OC = 24 V, Short circuit current = I_SC = 30 A
We know that
Resistance = V_OC/I_SC = 30/24 = 1.2 Ω

Current I = V/R = 24/3.2 = 7.5 A
The power dissipated by the bulb is = I² x R = 7.5² X 2 = 112.5 W 

Given V_t = 240 V, Line current (I) = 15 A, Armature resistance (R_a) = 0.5 Ω, Shunt resistance (R_sh) = 80 Ω

Shunt current = I_sh = 240/100 = 2.4 A

Armature current = I_a­ = 15 - 2.4 = 12.6 A

Back emf = E_b = V_t - I_aR_a = 240 - 12.6 × 0.5 = 233.7 V