Electrical Engineering Quiz 68
1 / 50
A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
2 / 50
What is true about the breakdown voltage in a Zener diode ?
3 / 50
A nichrome wire used as a heater coil has the resistance of 2 ?2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?
4 / 50
In squirrel cage induction motors which of the following methods of starting cannot be used ?
5 / 50
relay is preferred for phase fault on short transmission line?
6 / 50
A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?
7 / 50
BC 147 transistor indicates that it is made of____________?
8 / 50
The normal way to turn on a SCR is by______________?
9 / 50
In a cable capacitor, voltage gradient is maximum at the surface of the______________?
10 / 50
?In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch?. In thermal power plant, heat from the flue gases is utilized in___________?
11 / 50
The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?
12 / 50
The point of intersection of d.c. and a.c. load lines is called________________?
13 / 50
Which of the following statement is incorrect ?
14 / 50
A semiconductor has ______________ temperature coefficient of resistance?
15 / 50
Which of the following is the commonly used type of electromagnets ?
16 / 50
If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
17 / 50
What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
18 / 50
The dielectric strength of transformer oil is expected to be______________?
19 / 50
A Buchholz relay can be installed on
20 / 50
In regenerative cycle feed water is heated by_____________?
21 / 50
In case of a shaded pole motor the direction of rotation of the motor is__________?
22 / 50
In a base resistor method, if the value of ? changes by 50, then collector current will change by a factor ___________________?
23 / 50
For electroplating we use_________________?
24 / 50
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
25 / 50
A universal motor is one which______________?
26 / 50
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
27 / 50
When current flows through heater coil it glows but supply wiring does not glow because______________?
28 / 50
The commutator segments are connected to the armature conductors by means of___________?
29 / 50
Systematic errors are_________________?
30 / 50
In main line service as compared to urban and suburban service______________?
31 / 50
Reheat cycle in steam power plant is used to________________?
32 / 50
Which plant can never have 100 percent load factor?
33 / 50
If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?
34 / 50
During the commutation period in 3 phase converter, overlap time is____________?
35 / 50
The disadvantage with paper as insulating material is____________?
36 / 50
Which of the following motors is preferred for traction work ?
37 / 50
___________________is not a part of ball bearing ?
38 / 50
Due to which of the following reasons copper and aluminium are not used for heating elements ?
39 / 50
Arc in a circuit breaker is interrupted at___________?
40 / 50
_____________ has the lowest noise-level?
41 / 50
The operating voltage of a meggar is about_______________?
42 / 50
A source follower using an FET usually has a voltage gain which is___________?
43 / 50
Solder is an alloy of______________?
44 / 50
A voltmeter is connected in a _____________ with the circuit component across which potential difference is to be measured?
45 / 50
__________ instruments are those which measure the total quantity of electricity delivered in a particular time ?
46 / 50
In single core cables armouring is not done to________?
47 / 50
The relation between ? and a is______________?
48 / 50
Which of the following power plant usually offer highest maintenance cost___________?
49 / 50
Which motor is preferred for use in mines where explosive gases exist ?
50 / 50
If a battery is wrongly connected on charge following will happen__________?
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