Electrical Engineering Quiz

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Electrical Engineering

Electrical Engineering Quiz

1 / 25

The path of the magnetic flux in transformer should have:-

high resistance

Low reactance

High reluctance

2 / 25

A resistance of 5 ohm is further drawn so that its length becomes double. Its resistance will now be:-

5 ohm

20 ohm

.7.5 ohm

10 ohm

3 / 25

In parallel resonance ,the circuit impedance is :-

R/LC

L/CR

C/LR

4 / 25

Proper charging rate for lead acid battery is:-

1/4 of rated ampere hour capacity

1/3of rated ampere hour capacity

1/2 of rated ampere hour capacity

1/8 of rated ampere hour capacity

5 / 25

If the height of the transmission towers is increased , _______________ parameters is likely to change:-

capacitance

inductance

Resistance

6 / 25

A wire of 0.14mm diameter and specific resistance 9.6 micro ohm cm is 440 cm long.The resistance of the wire will be:-

9.6 ohm

27.4 ohm

11.3 ohm

7 / 25

Impulse testing of transformer is done using:-

Full wave standard impulse

Chopped wave standard impulse

Both a, b

Half wave standard impulse

8 / 25

Which meter is used a null detector in wheatstone bridge :-

Ammeter

Voltmeter

Galvanometer

9 / 25

A constant load power means a uniform conversion of:-

Electrical to mechanical energy

Current to voltage

Mechanical to electrical energy

10 / 25

An ideal transformer has infinite value of primary and secondary inductances. The statement is:-

True

False

11 / 25

The maximum efficiency of transformer coupled class A power amplifier is:-

50%

80%

30%

12 / 25

Admittance is reciprocal of:-

Capacitance

Impedance

Resistance

13 / 25

Which transformer side has a low cross sectional area:-

Secondary welding

High voltage welding

Primary welding

14 / 25

A transfer function of a system is used to calculate __________________:-

The time constant

The order of the system

The output of any given input

15 / 25

Wagner earthing device is used to eliminate errors due to :-

electromagnetic coupling

Both a, b

Electrostatic coupling

16 / 25

To keep the terminals of a lead acid storage battery free from corrosion, it is advisable to:-

Drills holes on the terminal top

Apply petroleum jelly

keep the electrolyte level low

17 / 25

At low value of power factor , the cost of generation of a power station will be:-

remain same

High

Low

18 / 25

For the safety of a steam boiler the number of safety valves fitted are:-

Two

Four

Three

19 / 25

A wire of resistance R has its length and cross section both doubled. Its resistance will become:-

2 R

20 / 25

In coal preparation plant, magnetic separators are used to remove:-

iron particles

dust

clinkers

21 / 25

In graphite ,bonding is ;-

Covalent

Metallic

Vander waals and covalent

22 / 25

The following system is not generally used:-

3 phase

1 phase

2 phase

23 / 25

____________ is not used as fuse material:-

Silver

Carbon

aluminium

Copper

24 / 25

The series capacitor peak voltmeter is suitable for;-

Negative half cycle

Positive half cycle

Both of them

25 / 25

±9 V supply is to be constructed using zinc carbon D cells. The total number of cells required will be:-

12 cells

16 cells

10 cells

8 cells

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