Related Questions

One-fifth of the batteries produced by an upstart factory are defective and one -quarter of all batteries produced are rejected by the quality control technician. If one-tenth of the non-defective batteries are rejected by mistake and if all the batteries not rejected are sold, then what percent of the batteries sold by the factory are defective?
A 4%
B 3%
C 6%
D 5%
Which one of the following statements applies to common, non-rechargeable flashlight batteries?
A Common flashlight batteries are secondary wet-cell batteries
B Common flashlight batteries are primary wet-cell batteries
C Common flashlight batteries are primary dry-cell batteries
D Common flashlight batteries are secondary dry-cell batteries
E None of the above
সিরিজে সংযুক্ত একটি এ্যামিটার এবং একটি অজানা রোধ দুটি একই রকম 1.5 V ব্যাটারীর দুই প্রান্তে সংযুক্ত আছে। যখন ব্যাটারী দুটি সিরিজে সংযুক্ত থাকে তখন এ্যামিটার। amp রিডিং প্রদর্শন করে। আবার ব্যাটারী দুটি সমান্তরালে সংযুক্ত করলে 0.6 amp রিডিং প্রদর্শন করে। ব্যাটারীর আভ্যন্তরিন রোধ কত ? (An ammeter and an unknown resistance are connected in series across two identical batteries of each 1.5 V. The ammeter shows current I amp and 0.6 amp when the batteries are connected in series and parallel, respectively. What is the internal resistance of the battery?)
A 13Ω
B 12Ω
C 1Ω
D 0.1Ω
E 23Ω
The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
A Star connected only
B Delta connected only
C Both (A) and (B)
D None of the above
A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?
A 23 km/hr
B 25 km /hr
C 20 km /hr
D 18 km /hr
Six batteries are kept one above the other. Jumbo is just above Pick. The Volt is between Tank and Ping. Lift is between Jumbo and Tank. Which battery is at second position from the bottom?
A Pick
B Tank
C Volt
D Jumbo
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?
A Mechanical rectifiers
B Copper oxide rectifiers
C Selenium rectifiers
D Electrolytic rectifiers
Which of the following pairs of materials serves as electrodes in rechargeable batteries commonly used in devices such as torch lights, electric shavers, etc. ?
A Iron and cadmium
B Nickel and cadmium
C Lead peroxide and lead
D Zinc and carbon
Life of the batteries is in the following ascending order.
A Lead-acid cell, Edison cell, Nickel cadmium cell
B Lead-acid cell, Nickel-cadmium cell, Edison cell
C Edison cell, Nickel-cadmium cell, lead-acid cell
D Nickel-cadmium cell, Edison cell, lead-acid cell
Batteries that 'run down too quickly' are--
A uneconomical
B universal
C fast
D fashinable

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