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WorksheetsBEE -Mech -Set2
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
If the resistance in a DC circuit is 10 ohms and the voltage is 20V, what is the current?
a)
2 Amps
b)
5 Amps
c)
0.5 Amps
d)
20 Amps
2.
In an AC circuit, the frequency is measured in?
a)
Ohms
b)
Volts
c)
Hertz
d)
Amperes
3.
The voltage ratio in a transformer is equal to the ratio of?
a)
Number of turns in primary and secondary
b)
Resistances in primary and secondary
c)
Capacitance in primary and secondary
d)
Inductances in primary and secondary
4.
Which motor type is used in fan and ceiling fan applications?
a)
Single-phase induction motor
b)
Synchronous motor
c)
BLDC motor
d)
Step motor
5.
Which device trips during earth leakage?
a)
MCB
b)
MCCB
c)
ELCB
d)
SFU
6.
What does an ELCB sense?
a)
Earth fault
b)
Short circuit
c)
Overload
d)
Temperature
7.
Magnetic contactor mainly operates with?
a)
Manual force
b)
Electromagnetic field
c)
Gas pressure
d)
Air suction
8.
Which type of reflector is best suited for focusing light in a spotlight?
a)
Parabolic
b)
Flat
c)
Elliptical
d)
Spherical
9.
What is the key benefit of using LED lamps in industrial applications?
a)
Higher initial cost
b)
Less brightness
c)
Energy efficiency
d)
Lower maintenance
10.
How is the quality of light measured?
a)
Through color temperature
b)
Through luminous efficiency
c)
Through foot-candles or lux
d)
Through wattage
11.
Which of these earthing systems is commonly used in factories?
a)
Plate earthing
b)
Rod earthing
c)
Ring earthing
d)
None
12.
What is the main objective of using earthing in electrical systems?
a)
To reduce power consumption
b)
To ensure safety of equipment
c)
To protect users from electric shocks
d)
To improve system efficiency
13.
Which of the following materials is often used for earthing conductors?
a)
Iron
b)
Copper
c)
Plastic
d)
Aluminum
14.
How can you prevent appliance overheating?
a)
Use appliances within their recommended load
b)
Ensure continuous operation without breaks
c)
Always set the appliance to its highest setting
d)
Place the appliance near a heat source
15.
How should power strips be used to avoid overloads?
a)
By plugging in multiple high-power appliances
b)
By using only one appliance per strip
c)
By plugging in appliances with a lower current rating
d)
By connecting multiple strips together
16.
Which type of battery is commonly used in electric vehicles?
a)
Lead-acid battery
b)
Lithium-ion battery
c)
Zinc-carbon battery
d)
Nickel-metal hydride battery
17.
What is the typical cycle life of a lithium-ion battery?
a)
300-500 cycles
b)
1000-1500 cycles
c)
2000-2500 cycles
d)
5000-6000 cycles
18.
Which type of battery is most commonly used in portable electronics like laptops and smartphones?
a)
Zinc-carbon
b)
Lithium-ion
c)
Nickel-cadmium
d)
Lead-acid
19.
How many units of electricity are consumed by a 1500W heater used for 4 hours?
a)
6 kWh
b)
7 kWh
c)
5 kWh
d)
4 kWh
20.
What does a voltmeter measure?
a)
Current
b)
Power
c)
Voltage
d)
Energy
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